feat: 添加手机MJPEG摄像头支持，锁定PaddleOCR 2.x版本

- 桌面端支持通过USB连接手机摄像头（MJPEG流），自动执行adb forward
- 添加Windows DirectShow后端，优化摄像头检测和错误提示
- 锁定paddleocr==2.10.0 + paddlepaddle==2.6.2，解决3.x PIR+oneDNN兼容性问题
- 简化ocr_offline.py，回退到稳定的2.x API

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

.gitignore

@@ -1,15 +1,66 @@
+# ==================================================
+# 数据文件
+# ==================================================
 data/input/*
 !data/input/.gitkeep
 data/output/*
 !data/output/.gitkeep
+
+# ==================================================
+# Python
+# ==================================================
 __pycache__/
-*.pyc
+*.py[cod]
+*$py.class
+*.so
+.Python
+.pytest_cache/
+.coverage
+htmlcov/
 .DS_Store
 .venv/
 venv/
+.env
 .serena/
 models/*
 !models/.gitkeep
 usb_bundle/
 
+# ==================================================
+# Android - 构建产物
+# ==================================================
+android-app/app/build/
+android-app/build/
+android-app/.gradle/
+android-app/.idea/
+android-app/local.properties
+android-app/captures/
+android-app/*.apk
+android-app/*.aab
+android-app/*.ap_
+android-app/output/
+android-app/.externalNativeBuild
+android-app/.cxx
 
+# Gradle
+android-app/gradle-app.setting
+android-app/.navigation/
+android-app/*/build/
+
+# Keystore files
+android-app/*.jks
+android-app/*.keystore
+
+# Debug
+android-app/**/kotlin/
+android-app/**/tmp/
+android-app/**/.kotlin/
+
+# ==================================================
+# PyInstaller 打包产物
+# ==================================================
+*.spec
+build/
+dist/
+*.exe
+*.db

android-app/README.md

@@ -0,0 +1,112 @@
+# USB 摄像头连接方案
+
+## 概述
+
+通过 USB 数据线将 Android 手机作为摄像头连接到电脑，无需 WiFi/网络。
+
+## 架构
+
+```
+┌─────────────────┐       USB        ┌─────────────────┐
+│   Android APP   │ ◄─────────────► │   电脑 ADB      │
+│  (MJPEG服务)    │   adb forward   │   desktop.py    │
+│   端口 8080     │                  │  localhost:8080 │
+└─────────────────┘                  └─────────────────┘
+```
+
+## 使用步骤
+
+### 1. 准备 Android APP
+
+#### 方式A: 使用 Android Studio 编译（推荐）
+
+1. 安装 Android Studio
+2. 打开 `android-app` 目录
+3. 连接手机或启动模拟器
+4. 点击 Run 按钮
+
+#### 方式B: 下载预编译 APK
+
+如需预编译 APK，请联系开发者或自行编译。
+
+### 2. 手机端操作
+
+1. **安装并启动**「USB摄像头」APP
+2. **开启 USB 调试**：
+   - 设置 → 关于手机 → 连续点击"版本号" 7次
+   - 设置 → 开发者选项 → USB调试（开启）
+3. 点击 APP 中的「启动」按钮
+4. 屏幕显示："服务运行中 端口: 8080"
+
+### 3. 电脑端操作
+
+#### 安装 ADB
+
+```bash
+# Windows: 下载 platform-tools
+# https://developer.android.com/tools/releases/platform-tools
+
+# 或使用 winget
+winget install Google.PlatformTools
+
+# 验证安装
+adb version
+```
+
+#### 连接手机
+
+```bash
+# 1. USB 连接手机，手机上弹出"允许USB调试"时点击"允许"
+# 2. 验证连接
+adb devices
+
+# 应显示类似：
+# List of devices attached
+# XXXXXXXX    device
+```
+
+#### 运行桌面程序
+
+```bash
+cd d:\code\post-ocr
+py -3.12 src\desktop.py
+```
+
+#### 连接摄像头
+
+1. 在程序中点击 **"🔌 USB连接"** 按钮
+2. 程序会自动执行 `adb forward tcp:8080 tcp:8080`
+3. 连接成功后显示实时画面
+
+## 工作原理
+
+1. 手机 APP 启动 MJPEG 流服务器（监听 8080 端口）
+2. ADB 将手机端口转发到电脑：`adb forward tcp:8080 tcp:8080`
+3. 电脑 OpenCV 读取：`cv2.VideoCapture("http://localhost:8080")`
+4. 画面实时显示，支持拍照识别
+
+## 故障排查
+
+### 问题：ADB 找不到设备
+
+- 检查 USB 线是否支持数据传输（非仅充电线）
+- 手机上是否允许 USB 调试
+- 尝试更换 USB 端口
+
+### 问题：连接失败
+
+- 确保 APP 已启动并显示"服务运行中"
+- 检查端口 8080 是否被占用
+- 尝试重启 APP
+
+### 问题：画面卡顿
+
+- 降低分辨率：在 CameraHelper.kt 中修改预览尺寸
+- 检查 USB 线质量
+
+## 技术栈
+
+- **Android**: Kotlin + Camera2 API
+- **网络**: MJPEG over HTTP
+- **电脑端**: Python + OpenCV + PyQt6
+- **通信**: ADB 端口转发

android-app/app/build.gradle

@@ -0,0 +1,35 @@
+apply plugin: 'com.android.application'
+apply plugin: 'kotlin-android'
+
+android {
+    namespace 'com.usbwebcam'
+    compileSdk 34
+
+    defaultConfig {
+        applicationId "com.usbwebcam"
+        minSdk 24
+        targetSdk 34
+        versionCode 1
+        versionName "1.0"
+    }
+
+    buildTypes {
+        release {
+            minifyEnabled false
+        }
+    }
+
+    compileOptions {
+        sourceCompatibility JavaVersion.VERSION_1_8
+        targetCompatibility JavaVersion.VERSION_1_8
+    }
+
+    kotlinOptions {
+        jvmTarget = '1.8'
+    }
+}
+
+dependencies {
+    implementation 'androidx.core:core-ktx:1.12.0'
+    implementation 'androidx.appcompat:appcompat:1.6.1'
+}

android-app/app/proguard-rules.pro

@@ -0,0 +1,10 @@
+# ProGuard rules for USB Webcam
+# Keep public class members
+-keep public class * {
+    public *;
+}
+
+# Keep Kotlin coroutines
+-keepnames class kotlinx.coroutines.internal.MainDispatcherFactory {}
+-keepnames class kotlinx.coroutines.CoroutineExceptionHandler {}
+-keep class kotlinx.coroutines.** { *; }

android-app/app/release/output-metadata.json

@@ -0,0 +1,37 @@
+{
+  "version": 3,
+  "artifactType": {
+    "type": "APK",
+    "kind": "Directory"
+  },
+  "applicationId": "com.usbwebcam",
+  "variantName": "release",
+  "elements": [
+    {
+      "type": "SINGLE",
+      "filters": [],
+      "attributes": [],
+      "versionCode": 1,
+      "versionName": "1.0",
+      "outputFile": "app-release.apk"
+    }
+  ],
+  "elementType": "File",
+  "baselineProfiles": [
+    {
+      "minApi": 28,
+      "maxApi": 30,
+      "baselineProfiles": [
+        "baselineProfiles/1/app-release.dm"
+      ]
+    },
+    {
+      "minApi": 31,
+      "maxApi": 2147483647,
+      "baselineProfiles": [
+        "baselineProfiles/0/app-release.dm"
+      ]
+    }
+  ],
+  "minSdkVersionForDexing": 24
+}

android-app/app/src/main/AndroidManifest.xml

@@ -0,0 +1,27 @@
+<?xml version="1.0" encoding="utf-8"?>
+<manifest xmlns:android="http://schemas.android.com/apk/res/android"
+    xmlns:tools="http://schemas.android.com/tools">
+
+    <uses-feature android:name="android.hardware.camera.any" />
+    <uses-permission android:name="android.permission.CAMERA" />
+    <uses-permission android:name="android.permission.INTERNET" />
+    <uses-permission android:name="android.permission.WAKE_LOCK" />
+    <uses-permission android:name="android.permission.ACCESS_NETWORK_STATE" />
+
+    <application
+        android:allowBackup="true"
+        android:label="USB摄像头"
+        android:theme="@style/Theme.AppCompat.NoActionBar">
+
+        <activity
+            android:name=".MainActivity"
+            android:exported="true"
+            android:screenOrientation="landscape"
+            android:keepScreenOn="true">
+            <intent-filter>
+                <action android:name="android.intent.action.MAIN" />
+                <category android:name="android.intent.category.LAUNCHER" />
+            </intent-filter>
+        </activity>
+    </application>
+</manifest>

android-app/app/src/main/java/com/usbwebcam/CameraHelper.kt

@@ -0,0 +1,180 @@
+package com.usbwebcam
+
+import android.content.Context
+import android.graphics.Bitmap
+import android.graphics.ImageFormat
+import android.graphics.Rect
+import android.graphics.YuvImage
+import android.hardware.camera2.*
+import android.media.Image
+import android.media.ImageReader
+import android.os.Handler
+import android.os.HandlerThread
+import android.util.Size
+import android.view.Surface
+import android.view.SurfaceHolder
+import java.io.ByteArrayOutputStream
+import java.io.File
+import java.io.FileOutputStream
+import java.text.SimpleDateFormat
+import java.util.*
+
+class CameraHelper(
+    private val context: Context,
+    private val onFrame: (ByteArray, Int, Int) -> Unit
+) {
+    private var cameraDevice: CameraDevice? = null
+    private var captureSession: CameraCaptureSession? = null
+    private var imageReader: ImageReader? = null
+    private var backgroundThread: HandlerThread? = null
+    private var backgroundHandler: Handler? = null
+
+    private val cameraManager = context.getSystemService(Context.CAMERA_SERVICE) as CameraManager
+    private val cameraId = cameraManager.cameraIdList.firstOrNull {
+        cameraManager.getCameraCharacteristics(it)
+            .get(CameraCharacteristics.LENS_FACING) == CameraCharacteristics.LENS_FACING_BACK
+    } ?: cameraManager.cameraIdList.first()
+
+    fun start() {
+        startBackgroundThread()
+        openCamera()
+    }
+
+    fun stop() {
+        closeCamera()
+        stopBackgroundThread()
+    }
+
+    private fun startBackgroundThread() {
+        backgroundThread = HandlerThread("CameraBackground").apply {
+            start()
+            backgroundHandler = Handler(looper)
+        }
+    }
+
+    private fun stopBackgroundThread() {
+        backgroundThread?.quitSafely()
+        backgroundThread?.join()
+        backgroundThread = null
+        backgroundHandler = null
+    }
+
+    private fun openCamera() {
+        try {
+            cameraManager.openCamera(cameraId, object : CameraDevice.StateCallback() {
+                override fun onOpened(camera: CameraDevice) {
+                    cameraDevice = camera
+                    createCameraPreviewSession()
+                }
+
+                override fun onDisconnected(camera: CameraDevice) {
+                    camera.close()
+                    cameraDevice = null
+                }
+
+                override fun onError(camera: CameraDevice, error: Int) {
+                    camera.close()
+                    cameraDevice = null
+                }
+            }, backgroundHandler!!)
+        } catch (e: SecurityException) {
+            e.printStackTrace()
+        }
+    }
+
+    private fun createCameraPreviewSession() {
+        try {
+            // 获取支持的尺寸
+            val characteristics = cameraManager.getCameraCharacteristics(cameraId)
+            val map = characteristics.get(CameraCharacteristics.SCALER_STREAM_CONFIGURATION_MAP)
+            val previewSize = map?.getOutputSizes(SurfaceHolder::class.java)?.firstOrNull {
+                it.width <= 1280 && it.height <= 720
+            } ?: Size(1280, 720)
+
+            imageReader = ImageReader.newInstance(previewSize.width, previewSize.height, ImageFormat.JPEG, 2)
+            imageReader?.setOnImageAvailableListener(imageAvailableListener, backgroundHandler)
+
+            val captureRequest = cameraDevice?.createCaptureRequest(CameraDevice.TEMPLATE_PREVIEW)?.apply {
+                addTarget(imageReader!!.surface)
+                set(CaptureRequest.CONTROL_AF_MODE, CaptureRequest.CONTROL_AF_MODE_CONTINUOUS_PICTURE)
+                set(CaptureRequest.CONTROL_AE_MODE, CaptureRequest.CONTROL_AE_MODE_ON)
+            }
+
+            cameraDevice?.createCaptureSession(
+                listOf(imageReader!!.surface),
+                object : CameraCaptureSession.StateCallback() {
+                    override fun onConfigured(session: CameraCaptureSession) {
+                        captureSession = session
+                        captureRequest?.let {
+                            session.setRepeatingRequest(it.build(), null, backgroundHandler)
+                        }
+                    }
+
+                    override fun onConfigureFailed(session: CameraCaptureSession) {}
+                },
+                backgroundHandler
+            )
+        } catch (e: Exception) {
+            e.printStackTrace()
+        }
+    }
+
+    private val imageAvailableListener = ImageReader.OnImageAvailableListener { reader ->
+        val image = reader.acquireLatestImage() ?: return@OnImageAvailableListener
+        try {
+            val buffer = image.planes[0].buffer
+            val bytes = ByteArray(buffer.remaining())
+            buffer.get(bytes)
+            onFrame(bytes, image.width, image.height)
+        } finally {
+            image.close()
+        }
+    }
+
+    fun captureAndSave() {
+        // 保存最后一帧
+        imageReader?.acquireLatestImage()?.use { image ->
+            val buffer = image.planes[0].buffer
+            val bytes = ByteArray(buffer.remaining())
+            buffer.get(bytes)
+
+            val timestamp = SimpleDateFormat("yyyyMMdd_HHmmss", Locale.getDefault()).format(Date())
+            val file = File(
+                context.getExternalFilesDir(null),
+                "envelope_$timestamp.jpg"
+            )
+
+            FileOutputStream(file).use { it.write(bytes) }
+        }
+    }
+
+    private fun closeCamera() {
+        try {
+            captureSession?.stopRepeating()
+            captureSession?.abortCaptures()
+        } catch (e: Exception) {
+            e.printStackTrace()
+        }
+
+        try {
+            captureSession?.close()
+        } catch (e: Exception) {
+            e.printStackTrace()
+        }
+        captureSession = null
+
+        try {
+            imageReader?.close()
+        } catch (e: Exception) {
+            e.printStackTrace()
+        }
+        imageReader = null
+
+        try {
+            cameraDevice?.close()
+        } catch (e: Exception) {
+            e.printStackTrace()
+        }
+        cameraDevice = null
+    }
+}

android-app/app/src/main/java/com/usbwebcam/MainActivity.kt

@@ -0,0 +1,116 @@
+package com.usbwebcam
+
+import android.Manifest
+import android.content.pm.PackageManager
+import android.os.Bundle
+import android.widget.Button
+import android.widget.TextView
+import android.widget.Toast
+import androidx.activity.result.contract.ActivityResultContracts
+import androidx.appcompat.app.AppCompatActivity
+import androidx.core.content.ContextCompat
+
+class MainActivity : AppCompatActivity() {
+    private var mjpegServer: MjpegServer? = null
+    private var cameraHelper: CameraHelper? = null
+
+    private val requestPermissionLauncher = registerForActivityResult(
+        ActivityResultContracts.RequestPermission()
+    ) { isGranted ->
+        if (isGranted) {
+            startCamera()
+        } else {
+            Toast.makeText(this, "需要相机权限", Toast.LENGTH_LONG).show()
+        }
+    }
+
+    override fun onCreate(savedInstanceState: Bundle?) {
+        super.onCreate(savedInstanceState)
+        setContentView(R.layout.activity_main)
+
+        val btnStart = findViewById<Button>(R.id.btn_start)
+        val btnStop = findViewById<Button>(R.id.btn_stop)
+        val btnCapture = findViewById<Button>(R.id.btn_capture)
+        val tvStatus = findViewById<TextView>(R.id.tv_status)
+
+        btnStart.setOnClickListener {
+            if (checkPermission()) {
+                startCamera()
+            }
+        }
+
+        btnStop.setOnClickListener {
+            stopCamera()
+        }
+
+        btnCapture.setOnClickListener {
+            cameraHelper?.captureAndSave()
+            Toast.makeText(this, "图片已保存到相册", Toast.LENGTH_SHORT).show()
+        }
+
+        if (ContextCompat.checkSelfPermission(
+                this,
+                Manifest.permission.CAMERA
+            ) == PackageManager.PERMISSION_GRANTED
+        ) {
+            startCamera()
+        }
+    }
+
+    private fun checkPermission(): Boolean {
+        return if (ContextCompat.checkSelfPermission(
+                this,
+                Manifest.permission.CAMERA
+            ) == PackageManager.PERMISSION_GRANTED
+        ) {
+            true
+        } else {
+            requestPermissionLauncher.launch(Manifest.permission.CAMERA)
+            false
+        }
+    }
+
+    private fun startCamera() {
+        if (cameraHelper != null) return
+
+        mjpegServer = MjpegServer(8080)
+        cameraHelper = CameraHelper(this) { frame, _, _ ->
+            mjpegServer?.updateFrame(frame)
+        }
+        
+        // Start the server and update UI once started
+        mjpegServer?.start {
+            runOnUiThread {
+                findViewById<TextView>(R.id.tv_status).text = """
+                    服务运行中
+                    端口: 8080
+                    IP: 无需IP (ADB模式)
+                    USB连接命令:
+                    adb forward tcp:8080 tcp:8080
+                """.trimIndent()
+                findViewById<Button>(R.id.btn_start).isEnabled = false
+                findViewById<Button>(R.id.btn_stop).isEnabled = true
+            }
+        }
+
+        cameraHelper?.start()
+    }
+
+    private fun stopCamera() {
+        cameraHelper?.stop()
+        cameraHelper = null
+        mjpegServer?.stop()
+        mjpegServer = null
+
+        runOnUiThread {
+            findViewById<TextView>(R.id.tv_status).text = "服务已停止"
+            findViewById<Button>(R.id.btn_start).isEnabled = true
+            findViewById<Button>(R.id.btn_stop).isEnabled = false
+        }
+    }
+
+    override fun onDestroy() {
+        super.onDestroy()
+        stopCamera()
+    }
+}

android-app/app/src/main/java/com/usbwebcam/MjpegServer.kt

@@ -0,0 +1,151 @@
+package com.usbwebcam
+
+import java.io.OutputStream
+import java.net.ServerSocket
+import java.net.Socket
+import java.util.concurrent.CopyOnWriteArrayList
+import java.util.concurrent.atomic.AtomicBoolean
+
+class MjpegServer(private val port: Int) {
+    private var serverSocket: ServerSocket? = null
+    private var serverThread: Thread? = null
+    private val clients = CopyOnWriteArrayList<ClientHandler>()
+    private val running = AtomicBoolean(false)
+    private var currentFrame: ByteArray? = null
+    private val frameLock = Any()
+
+    fun start(onStarted: () -> Unit) {
+        serverThread = Thread {
+            try {
+                serverSocket = ServerSocket(port)
+                running.set(true)
+                onStarted()
+
+                while (running.get()) {
+                    val client = try {
+                        serverSocket?.accept()
+                    } catch (e: Exception) {
+                        null
+                    } ?: continue
+
+                    val handler = ClientHandler(client)
+                    clients.add(handler)
+                    handler.start()
+
+                    // 发送当前帧
+                    val frameToSend = synchronized(frameLock) {
+                        currentFrame
+                    }
+                    if (frameToSend != null) {
+                        handler.sendFrame(frameToSend)
+                    }
+                }
+            } catch (e: Exception) {
+                if (running.get()) {
+                    e.printStackTrace()
+                }
+            }
+        }.apply {
+            name = "MjpegServerThread"
+            start()
+        }
+    }
+
+    fun updateFrame(frame: ByteArray) {
+        synchronized(frameLock) {
+            currentFrame = frame
+        }
+
+        // 广播给所有客户端
+        val iterator = clients.iterator()
+        while (iterator.hasNext()) {
+            val handler = iterator.next()
+            if (handler.isClientAlive()) {
+                handler.sendFrame(frame)
+            } else {
+                iterator.remove()
+            }
+        }
+    }
+
+    fun stop() {
+        if (!running.getAndSet(false)) return
+
+        try {
+            serverSocket?.close()
+        } catch (e: Exception) {
+            // ignore
+        }
+
+        clients.forEach { it.close() }
+        clients.clear()
+        serverSocket = null
+        serverThread = null
+    }
+
+    private class ClientHandler(private val socket: Socket) : Thread() {
+        private var clientStream: OutputStream? = null
+        @Volatile
+        private var initialized = false
+
+        override fun run() {
+            try {
+                val os = socket.getOutputStream()
+                clientStream = os
+                socket.setSoTimeout(5000)
+
+                // 读取HTTP请求
+                val buffer = ByteArray(1024)
+                socket.getInputStream().read(buffer)
+
+                // 发送HTTP响应头
+                val header = byteArrayOf(
+                    *("HTTP/1.1 200 OK\r\n").toByteArray(),
+                    *("Content-Type: multipart/x-mixed-replace; boundary=boundary\r\n").toByteArray(),
+                    *("Cache-Control: no-cache\r\n").toByteArray(),
+                    *("Connection: close\r\n").toByteArray(),
+                    *("\r\n").toByteArray()
+                )
+
+                os.write(header)
+                os.flush()
+                initialized = true
+            } catch (e: Exception) {
+                close()
+            }
+        }
+
+        fun sendFrame(frame: ByteArray) {
+            if (!initialized) return
+
+            try {
+                // MJPEG frame header
+                val header = byteArrayOf(
+                    *("--boundary\r\n").toByteArray(),
+                    *("Content-Type: image/jpeg\r\n").toByteArray(),
+                    *("Content-Length: ${frame.size}\r\n").toByteArray(),
+                    *("\r\n").toByteArray()
+                )
+
+                clientStream?.write(header)
+                clientStream?.write(frame)
+                clientStream?.write("\r\n".toByteArray())
+                clientStream?.flush()
+            } catch (e: Exception) {
+                close()
+            }
+        }
+
+        fun close() {
+            try {
+                socket.close()
+            } catch (e: Exception) {
+                e.printStackTrace()
+            }
+        }
+
+        fun isClientAlive(): Boolean {
+            return !socket.isClosed && socket.isConnected
+        }
+    }
+}

android-app/app/src/main/res/layout/activity_main.xml

@@ -0,0 +1,51 @@
+<?xml version="1.0" encoding="utf-8"?>
+<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
+    android:layout_width="match_parent"
+    android:layout_height="match_parent"
+    android:orientation="vertical"
+    android:padding="24dp"
+    android:gravity="center">
+
+    <TextView
+        android:id="@+id/tv_status"
+        android:layout_width="wrap_content"
+        android:layout_height="wrap_content"
+        android:text="等待启动..."
+        android:textSize="16sp"
+        android:textColor="#333"
+        android:layout_marginBottom="32dp" />
+
+    <LinearLayout
+        android:layout_width="wrap_content"
+        android:layout_height="wrap_content"
+        android:orientation="horizontal"
+        android:gravity="center">
+
+        <Button
+            android:id="@+id/btn_start"
+            android:layout_width="120dp"
+            android:layout_height="60dp"
+            android:text="启动"
+            android:textSize="18sp"
+            android:layout_marginEnd="16dp" />
+
+        <Button
+            android:id="@+id/btn_stop"
+            android:layout_width="120dp"
+            android:layout_height="60dp"
+            android:text="停止"
+            android:textSize="18sp"
+            android:enabled="false" />
+
+    </LinearLayout>
+
+    <Button
+        android:id="@+id/btn_capture"
+        android:layout_width="200dp"
+        android:layout_height="70dp"
+        android:text="拍照保存"
+        android:textSize="20sp"
+        android:layout_marginTop="24dp"
+        android:backgroundTint="#4CAF50" />
+
+</LinearLayout>

android-app/build.gradle

@@ -0,0 +1,23 @@
+// Top-level build file
+buildscript {
+    ext.kotlin_version = '2.2.10'
+    repositories {
+        google()
+        mavenCentral()
+    }
+    dependencies {
+        classpath 'com.android.tools.build:gradle:9.0.0'
+        classpath "org.jetbrains.kotlin:kotlin-gradle-plugin:$kotlin_version"
+    }
+}
+
+allprojects {
+    repositories {
+        google()
+        mavenCentral()
+    }
+}
+
+task clean(type: Delete) {
+    delete rootProject.buildDir
+}

android-app/gradle.properties

@@ -0,0 +1,14 @@
+# Project-wide Gradle settings
+org.gradle.jvmargs=-Xmx2048m -Dfile.encoding=UTF-8
+android.useAndroidX=true
+android.enableJetifier=true
+android.defaults.buildfeatures.resvalues=true
+android.sdk.defaultTargetSdkToCompileSdkIfUnset=false
+android.enableAppCompileTimeRClass=false
+android.usesSdkInManifest.disallowed=false
+android.uniquePackageNames=false
+android.dependency.useConstraints=true
+android.r8.strictFullModeForKeepRules=false
+android.r8.optimizedResourceShrinking=false
+android.builtInKotlin=false
+android.newDsl=false

android-app/gradle/gradle-daemon-jvm.properties

@@ -0,0 +1,13 @@
+#This file is generated by updateDaemonJvm
+toolchainUrl.FREE_BSD.AARCH64=https\://api.foojay.io/disco/v3.0/ids/536afcd1dff540251f85e5d2c80458cf/redirect
+toolchainUrl.FREE_BSD.X86_64=https\://api.foojay.io/disco/v3.0/ids/ecd23fd7707c683afbcd6052998cb6a9/redirect
+toolchainUrl.LINUX.AARCH64=https\://api.foojay.io/disco/v3.0/ids/536afcd1dff540251f85e5d2c80458cf/redirect
+toolchainUrl.LINUX.X86_64=https\://api.foojay.io/disco/v3.0/ids/ecd23fd7707c683afbcd6052998cb6a9/redirect
+toolchainUrl.MAC_OS.AARCH64=https\://api.foojay.io/disco/v3.0/ids/10fc3bf1ee0001078a473afe6e43cfdb/redirect
+toolchainUrl.MAC_OS.X86_64=https\://api.foojay.io/disco/v3.0/ids/9c55677aff3966382f3d853c0959bfb2/redirect
+toolchainUrl.UNIX.AARCH64=https\://api.foojay.io/disco/v3.0/ids/536afcd1dff540251f85e5d2c80458cf/redirect
+toolchainUrl.UNIX.X86_64=https\://api.foojay.io/disco/v3.0/ids/67a0fee3c4236b6397dcbe8575ca2011/redirect
+toolchainUrl.WINDOWS.AARCH64=https\://api.foojay.io/disco/v3.0/ids/248ffb1098f61659502d0c09aa348294/redirect
+toolchainUrl.WINDOWS.X86_64=https\://api.foojay.io/disco/v3.0/ids/ac151d55def6b6a9a159dc4cb4642851/redirect
+toolchainVendor=JETBRAINS
+toolchainVersion=21

android-app/gradle/wrapper/gradle-wrapper.properties

@@ -0,0 +1,5 @@
+distributionBase=GRADLE_USER_HOME
+distributionPath=wrapper/dists
+distributionUrl=https\://services.gradle.org/distributions/gradle-9.2.1-bin.zip
+zipStoreBase=GRADLE_USER_HOME
+zipStorePath=wrapper/dists

android-app/gradlew.bat

@@ -0,0 +1,102 @@
+@rem
+@rem Copyright 2015 the original author or authors.
+@rem
+@rem Licensed under the Apache License, Version 2.0 (the "License");
+@rem you may not use this file except in compliance with the License.
+@rem You may obtain a copy of the License at
+@rem
+@rem      https://www.apache.org/licenses/LICENSE-2.0
+@rem
+@rem Unless required by applicable law or agreed to in writing, software
+@rem distributed under the License is distributed on an "AS IS" BASIS,
+@rem WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+@rem See the License for the specific language governing permissions and
+@rem limitations under the License.
+@rem
+
+@if "%DEBUG%"=="" @echo off
+@rem ##########################################################################
+@rem
+@rem  Gradle startup script for Windows
+@rem
+@rem ##########################################################################
+
+@rem Set local scope for the variables with windows NT shell
+if "%OS%"=="Windows_NT" setlocal
+
+set DIRNAME=%~dp0
+if "%DIRNAME%"=="" set DIRNAME=.
+set APP_BASE_NAME=%~n0
+set APP_HOME=%DIRNAME%
+
+@rem Resolve any "." and ".." in APP_HOME to make it shorter.
+for %%i in ("%APP_HOME%") do set APP_HOME=%%~fi
+
+@rem Add default JVM options here. You can also use JAVA_OPTS and GRADLE_OPTS to pass JVM options to this script.
+set DEFAULT_JVM_OPTS="-Xmx64m" "-Xms64m"
+
+@rem Find java.exe
+if defined JAVA_HOME goto findJavaFromJavaHome
+
+set JAVA_EXE=java.exe
+%JAVA_EXE% -version >NUL 2>&1
+if "%ERRORLEVEL%" == "0" goto init
+
+echo.
+echo ERROR: JAVA_HOME is not set and no 'java' command could be found in your PATH.
+echo.
+echo Please set the JAVA_HOME variable in your environment to match the
+echo location of your Java installation.
+
+goto fail
+
+:findJavaFromJavaHome
+set JAVA_HOME=%JAVA_HOME:"=%
+set JAVA_EXE=%JAVA_HOME%/bin/java.exe
+
+if exist "%JAVA_EXE%" goto init
+
+echo.
+echo ERROR: JAVA_HOME is set to an invalid directory: %JAVA_HOME%
+echo.
+echo Please set the JAVA_HOME variable in your environment to match the
+echo location of your Java installation.
+
+goto fail
+
+:init
+@rem Get command-line arguments, handling Windows variants
+
+if not "%OS%" == "Windows_NT" goto win9xME_args
+:win9xME_args
+@rem Slurp the command line arguments.
+set CMD_LINE_ARGS=
+set _SKIP=2
+
+:win9xME_args_slurp
+if "x%~1" == "x" goto execute
+
+set CMD_LINE_ARGS=%*
+
+:execute
+@rem Setup the command line
+
+set CLASSPATH=%APP_HOME%\gradle\wrapper\gradle-wrapper.jar
+
+@rem Execute Gradle
+"%JAVA_EXE%" %DEFAULT_JVM_OPTS% %JAVA_OPTS% %GRADLE_OPTS% -classpath "%CLASSPATH%" org.gradle.wrapper.GradleWrapperMain %CMD_LINE_ARGS%
+
+:end
+@rem End local scope for the variables with windows NT shell
+if "%ERRORLEVEL%"=="0" goto mainEnd
+
+:fail
+rem Set variable GRADLE_EXIT_CONSOLE if you need the _script_ return code instead of
+rem the _cmd.exe /c_ return code!
+if not "" == "%GRADLE_EXIT_CONSOLE%" exit 1
+exit /b 1
+
+:mainEnd
+if "%OS%"=="Windows_NT" endlocal
+
+:omega

android-app/local.properties

@@ -0,0 +1,8 @@
+## This file must *NOT* be checked into Version Control Systems,
+# as it contains information specific to your local configuration.
+#
+# Location of the SDK. This is only used by Gradle.
+# For customization when using a Version Control System, please read the
+# header note.
+#Thu Feb 12 21:01:39 CST 2026
+sdk.dir=C\:\\Users\\yuanjian\\AppData\\Local\\Android\\Sdk

android-app/settings.gradle

@@ -0,0 +1,5 @@
+plugins {
+    id 'org.gradle.toolchains.foojay-resolver-convention' version '1.0.0'
+}
+rootProject.name = "UsbWebcam"
+include ':app'

build_exe.py

@@ -0,0 +1,64 @@
+#!/usr/bin/env python3
+"""
+打包脚本 - 将桌面程序打包成独立可执行文件
+使用方法: pip install pyinstaller && python build_exe.py
+
+调试版本: python build_exe.py --debug
+"""
+import subprocess
+import sys
+from pathlib import Path
+
+PROJECT_ROOT = Path(__file__).parent)
+
+
+def build(debug=False):
+    """使用 PyInstaller 打包"""
+
+    print("正在打包，请稍候...")
+    print(f"工作目录: {PROJECT_ROOT}")
+    print("-" * 50)
+
+    # 使用 Python -m PyInstaller 方式
+    # --paths 将 src 目录添加到 Python 路径，避免导入问题
+    cmd = [
+        sys.executable,
+        "-m", "PyInstaller",
+        "--name=信封信息提取系统",
+        "--onefile",
+        "--clean",
+        "--noconfirm",
+        "--paths=src",
+    ]
+
+    # 调试模式：显示控制台窗口，便于查看错误
+    if not debug:
+        cmd.append("--windowed")
+
+    cmd.append("src/desktop.py")
+
+    try:
+        subprocess.run(cmd, check=True, cwd=str(PROJECT_ROOT))
+        print("-" * 50)
+        print("打包完成！")
+        exe_path = PROJECT_ROOT / "dist" / "信封信息提取系统.exe"
+        if exe_path.exists():
+            size_mb = exe_path.stat().st_size / 1024 / 1024
+            print(f"可执行文件: {exe_path}")
+            print(f"文件大小: {size_mb:.1f} MB")
+        else:
+            print("警告: 未找到输出文件")
+    except subprocess.CalledProcessError as e:
+        print("-" * 50)
+        print(f"打包失败: {e}")
+        sys.exit(1)
+    except FileNotFoundError:
+        print("-" * 50)
+        print("错误: 未找到 PyInstaller")
+        print("请先安装: pip install pyinstaller")
+        sys.exit(1)
+
+
+if __name__ == "__main__":
+    debug = "--debug" in sys.argv
+    build(debug=debug)

requirements.txt

@@ -1,6 +1,9 @@
 # 桌面版依赖（本地电脑安装）
-paddleocr>=2.6,<3
-paddlepaddle>=2.5,<3
+# ⚠️ PaddleOCR 3.x 有 PIR+oneDNN 兼容性问题，必须使用 2.x
+paddleocr==2.10.0
+paddlepaddle==2.6.2
+
+# 数据处理
 pandas
 openpyxl
 pydantic

scripts/prepare_models.py

@@ -25,11 +25,6 @@ def parse_args() -> argparse.Namespace:
         default="models",
         help="模型输出目录（默认：models，建议与 exe 同级）",
     )
-    parser.add_argument(
-        "--show-log",
-        action="store_true",
-        help="显示 PaddleOCR 初始化日志（默认关闭）",
-    )
     return parser.parse_args()
 
 
@@ -39,7 +34,6 @@ def main() -> int:
     models_dir.mkdir(parents=True, exist_ok=True)
 
     # 关键：把 PaddleOCR 默认 base_dir 指到我们指定的 models/
-    os.environ["PADDLE_PDX_DISABLE_MODEL_SOURCE_CHECK"] = "True"
     os.environ["PADDLE_OCR_BASE_DIR"] = str(models_dir)
 
     # 延迟导入：确保环境变量在模块加载前生效
@@ -48,8 +42,8 @@ def main() -> int:
     print(f"将下载/补齐模型到: {models_dir}")
     print("首次执行需要联网下载（约数百 MB），请耐心等待。")
 
-    # 初始化会自动下载 det/rec/cls 模型到 BASE_DIR/whl/...
-    PaddleOCR(lang="ch", show_log=args.show_log, use_angle_cls=False)
+    # 初始化会自动下载 det/rec 模型到 BASE_DIR/whl/...
+    PaddleOCR(lang="ch", use_angle_cls=False, show_log=False)
 
     print("完成。你可以将该 models/ 目录随 zip 目录包一起分发（与 exe 同级）。")
     return 0

src/desktop.py

@@ -11,6 +11,7 @@ import time
 import logging
 import threading
 import queue
+import subprocess
 from datetime import datetime
 from pathlib import Path
 
@@ -26,8 +27,6 @@ from PyQt6.QtGui import QImage, QPixmap, QFont, QAction, QKeySequence, QShortcut
 from processor import extract_info
 from ocr_offline import create_offline_ocr, get_models_base_dir
 
-os.environ["PADDLE_PDX_DISABLE_MODEL_SOURCE_CHECK"] = "True"
-
 logger = logging.getLogger("post_ocr.desktop")
 
 
@@ -122,7 +121,7 @@ class OCRService(QObject):
     def _ensure_ocr(self) -> None:
         if self._ocr is None:
             logger.info("OCR ensure_ocr: 开始创建 PaddleOCR（线程=%s）", threading.current_thread().name)
-            self._ocr = create_offline_ocr(models_base_dir=self._models_base_dir, show_log=False)
+            self._ocr = create_offline_ocr(models_base_dir=self._models_base_dir)
             logger.info("OCR ensure_ocr: PaddleOCR 创建完成")
             self.ready.emit()
 
@@ -525,7 +524,13 @@ class MainWindow(QMainWindow):
     def load_cameras(self):
         """扫描可用摄像头"""
         self.cam_combo.clear()
-        # macOS 上设备编号会变化（尤其“连续互通相机”/虚拟摄像头），这里多扫一些更稳。
+
+        # 始终提供手机 MJPEG 流入口（Android 端 MjpegServer 默认端口 8080）
+        # 使用前需：1) USB 连接手机  2) adb forward tcp:8080 tcp:8080
+        mjpeg_url = os.environ.get("POST_OCR_MJPEG_URL", "http://localhost:8080").strip()
+        self.cam_combo.addItem(f"📱 手机摄像头 (USB)", mjpeg_url)
+
+        # macOS 上设备编号会变化（尤其"连续互通相机"/虚拟摄像头），这里多扫一些更稳。
         # 若你想减少探测范围，可设置环境变量 POST_OCR_MAX_CAMERAS，例如：POST_OCR_MAX_CAMERAS=3
         try:
             max_probe = int(os.environ.get("POST_OCR_MAX_CAMERAS", "").strip() or "10")
@@ -560,26 +565,93 @@ class MainWindow(QMainWindow):
                     pass
 
         if found == 0:
-            # 自动探测可能因权限/占用/设备延迟失败；仍提供手动尝试入口，避免用户被“无设备”卡住
-            for i in range(max_probe):
+            # 自动探测失败时，仅提供少量手动入口（0~2），避免列出大量不存在的设备误导用户
+            fallback_count = min(3, max_probe)
+            for i in range(fallback_count):
                 self.cam_combo.addItem(f"摄像头 {i}（手动尝试）", i)
-            self.statusBar().showMessage(
-                "未能自动检测到可用摄像头。"
-                "如为 macOS，请在 系统设置->隐私与安全->相机 中允许当前终端/应用访问；"
-                "并确保 iPhone 已解锁且未被其他应用占用。"
-            )
+            if sys.platform == "win32":
+                hint = (
+                    "未检测到摄像头。请确认：1) 已连接摄像头或已启动 Droidcam/Iriun；"
+                    "2) 其他应用未占用摄像头；3) 可手动选择编号后点击「连接」尝试。"
+                )
+            else:
+                hint = (
+                    "未检测到摄像头。"
+                    "macOS 请在 系统设置->隐私与安全->相机 中允许访问；"
+                    "并确保 iPhone 已解锁且未被其他应用占用。"
+                )
+            self.statusBar().showMessage(hint)
         else:
             self.statusBar().showMessage(f"检测到 {found} 个摄像头")
         logger.info("摄像头扫描结束：found=%s", found)
 
-    def _open_capture(self, cam_id: int):
+    def _adb_forward(self, local_port: int = 8080, remote_port: int = 8080) -> bool:
+        """自动执行 adb forward，将手机端口映射到本地。成功返回 True。"""
+        cmd = ["adb", "forward", f"tcp:{local_port}", f"tcp:{remote_port}"]
+        try:
+            r = subprocess.run(cmd, capture_output=True, text=True, timeout=10)
+            if r.returncode == 0:
+                logger.info("adb forward 成功：%s", " ".join(cmd))
+                return True
+            # adb 存在但执行失败（如无设备）
+            stderr = (r.stderr or "").strip()
+            logger.warning("adb forward 失败(rc=%s): %s", r.returncode, stderr)
+            QMessageBox.warning(
+                self,
+                "ADB 端口转发失败",
+                f"执行 adb forward 失败：\n{stderr}\n\n"
+                "排查建议：\n"
+                "1) 手机通过 USB 数据线连接电脑\n"
+                "2) 手机开启 USB 调试（开发者选项）\n"
+                "3) 首次连接时在手机上点击「允许 USB 调试」\n",
+            )
+            return False
+        except FileNotFoundError:
+            logger.warning("adb 未找到，请确认已安装 Android SDK Platform-Tools")
+            QMessageBox.warning(
+                self,
+                "未找到 ADB",
+                "未找到 adb 命令。\n\n"
+                "请安装 Android SDK Platform-Tools 并确保 adb 在 PATH 中。\n"
+                "下载地址：https://developer.android.com/tools/releases/platform-tools",
+            )
+            return False
+        except subprocess.TimeoutExpired:
+            logger.warning("adb forward 超时")
+            QMessageBox.warning(self, "ADB 超时", "adb forward 执行超时，请检查 USB 连接。")
+            return False
+
+    def _open_capture(self, cam_id):
         """
         打开摄像头。
 
-        macOS 上优先使用 AVFoundation 后端（对“连续互通相机”等更友好）。
+        cam_id 可以是：
+        - int: 本地摄像头索引（0, 1, 2...）
+        - str: MJPEG 流 URL（如 http://localhost:8080）
+
+        本地摄像头：
+        - Windows 优先使用 DirectShow 后端（更快更稳定）
+        - macOS 优先使用 AVFoundation 后端（对"连续互通相机"等更友好）
         """
 
-        if sys.platform == "darwin" and hasattr(cv2, "CAP_AVFOUNDATION"):
+        # MJPEG 流 URL：直接用 OpenCV 打开
+        if isinstance(cam_id, str):
+            logger.info("打开 MJPEG 流：%s", cam_id)
+            return cv2.VideoCapture(cam_id)
+
+        if sys.platform == "win32" and hasattr(cv2, "CAP_DSHOW"):
+            cap = cv2.VideoCapture(cam_id, cv2.CAP_DSHOW)
+            try:
+                if cap is not None and cap.isOpened():
+                    return cap
+            except Exception:
+                pass
+            try:
+                if cap is not None:
+                    cap.release()
+            except Exception:
+                pass
+        elif sys.platform == "darwin" and hasattr(cv2, "CAP_AVFOUNDATION"):
             cap = cv2.VideoCapture(cam_id, cv2.CAP_AVFOUNDATION)
             try:
                 if cap is not None and cap.isOpened():
@@ -597,9 +669,22 @@ class MainWindow(QMainWindow):
         """连接/断开摄像头"""
         if self.cap is None:
             cam_id = self.cam_combo.currentData()
-            if cam_id is None or cam_id < 0:
+            if cam_id is None:
                 QMessageBox.warning(self, "错误", "请先选择有效的摄像头")
                 return
+            # int 类型的 cam_id 需 >= 0；str 类型为 MJPEG URL
+            if isinstance(cam_id, int) and cam_id < 0:
+                QMessageBox.warning(self, "错误", "请先选择有效的摄像头")
+                return
+
+            is_mjpeg = isinstance(cam_id, str)
+            if is_mjpeg:
+                self.statusBar().showMessage("正在设置 ADB 端口转发...")
+                QApplication.processEvents()
+                if not self._adb_forward():
+                    return
+                self.statusBar().showMessage(f"正在连接手机摄像头 {cam_id} ...")
+                QApplication.processEvents()
 
             self.cap = self._open_capture(cam_id)
 
@@ -618,15 +703,25 @@ class MainWindow(QMainWindow):
                 if not ok:
                     self.cap.release()
                     self.cap = None
-                    QMessageBox.warning(
-                        self,
-                        "摄像头无画面",
-                        "摄像头已打开，但读取不到画面。\n\n"
-                        "排查建议：\n"
-                        "1) macOS：系统设置 -> 隐私与安全 -> 相机，允许当前运行的终端/应用访问\n"
-                        "2) 连续互通相机：保持 iPhone 解锁并靠近 Mac，且未被其他应用占用\n"
-                        "3) 依次切换“摄像头 0/1/2”尝试\n",
-                    )
+                    if is_mjpeg:
+                        QMessageBox.warning(
+                            self,
+                            "手机摄像头无画面",
+                            "已连接但读取不到画面。\n\n"
+                            "排查建议：\n"
+                            "1) 确认手机端 App 已点击「启动」\n"
+                            "2) 确认已执行：adb forward tcp:8080 tcp:8080\n"
+                            "3) 检查 USB 线是否为数据线（非纯充电线）\n",
+                        )
+                    else:
+                        QMessageBox.warning(
+                            self,
+                            "摄像头无画面",
+                            "摄像头已打开，但读取不到画面。\n\n"
+                            "排查建议：\n"
+                            "1) 确认摄像头未被其他应用占用\n"
+                            "2) 依次切换「摄像头 0/1/2」尝试\n",
+                        )
                     return
 
                 self.timer.start(30)  # ~33 FPS
@@ -636,16 +731,27 @@ class MainWindow(QMainWindow):
                 self.statusBar().showMessage("摄像头已连接")
             else:
                 self.cap = None
-                QMessageBox.warning(
-                    self,
-                    "无法打开摄像头",
-                    "无法打开摄像头。\n\n"
-                    "排查建议：\n"
-                    "1) macOS：系统设置 -> 隐私与安全 -> 相机，允许当前运行的终端/应用访问\n"
-                    "2) 如果有其他应用正在使用摄像头（微信/会议软件/浏览器），请先退出再试\n"
-                    "3) 连续互通相机：保持 iPhone 解锁并靠近 Mac，且未被其他应用占用\n"
-                    "4) 在下拉框中切换不同编号（0/1/2/3...）重试\n",
-                )
+                if is_mjpeg:
+                    QMessageBox.warning(
+                        self,
+                        "无法连接手机摄像头",
+                        f"无法连接 {cam_id}\n\n"
+                        "排查步骤：\n"
+                        "1) 手机通过 USB 数据线连接电脑\n"
+                        "2) 手机开启 USB 调试（开发者选项）\n"
+                        "3) 手机端 App 点击「启动」\n"
+                        "4) 电脑终端执行：adb forward tcp:8080 tcp:8080\n"
+                        "5) 再点击「连接」\n",
+                    )
+                else:
+                    QMessageBox.warning(
+                        self,
+                        "无法打开摄像头",
+                        "无法打开摄像头。\n\n"
+                        "排查建议：\n"
+                        "1) 确认摄像头未被其他应用占用\n"
+                        "2) 在下拉框中切换不同编号重试\n",
+                    )
         else:
             self.timer.stop()
             self.cap.release()

src/ocr_offline.py

@@ -2,44 +2,30 @@
 """
 离线 OCR 初始化工具
 
-目标：
-1. Windows 交付 zip 目录包时，模型随包携带，程序完全离线可用
-2. 如果模型缺失，明确报错并阻止 PaddleOCR 自动联网下载
-3. 统一桌面版 / Web 版 / 命令行的 OCR 初始化逻辑，避免参数漂移
+适配 PaddleOCR 2.10.0（PP-OCRv4）。
+
+模型默认缓存在 ~/.paddleocr/whl/，首次运行会自动下载。
 """
 
 from __future__ import annotations
 
 import os
 import sys
-from dataclasses import dataclass
 from pathlib import Path
 import logging
 
 
-@dataclass(frozen=True)
-class OCRModelPaths:
-    """PP-OCRv4（中文）模型目录结构（对应 paddleocr==2.10.0 默认下载结构）"""
-
-    base_dir: Path
-    det_dir: Path
-    rec_dir: Path
-    cls_dir: Path
-
-
 def _is_frozen() -> bool:
     """判断是否为 PyInstaller 打包后的运行环境"""
-
     return bool(getattr(sys, "frozen", False))
 
 
 def get_app_base_dir() -> Path:
     """
-    获取“应用根目录”：
+    获取"应用根目录"：
     - 开发态：项目根目录（src 的上一级）
     - 打包态：exe 所在目录
     """
-
     if _is_frozen():
         return Path(sys.executable).resolve().parent
     return Path(__file__).resolve().parent.parent
@@ -47,26 +33,10 @@ def get_app_base_dir() -> Path:
 
 def get_models_base_dir(app_base_dir: Path | None = None) -> Path:
     """默认模型目录：与应用同级的 models/"""
-
     base = app_base_dir or get_app_base_dir()
     return base / "models"
 
 
-def get_ppocr_v4_ch_model_paths(models_base_dir: Path | None = None) -> OCRModelPaths:
-    """
-    返回 PP-OCRv4（中文）默认模型目录。
-
-    注意：这里的目录结构与 PaddleOCR 2.x 默认下载到 ~/.paddleocr 的结构一致，
-    只是我们把 BASE_DIR 指向了随包的 models/，从而实现离线。
-    """
-
-    base = models_base_dir or get_models_base_dir()
-    det_dir = base / "whl" / "det" / "ch" / "ch_PP-OCRv4_det_infer"
-    rec_dir = base / "whl" / "rec" / "ch" / "ch_PP-OCRv4_rec_infer"
-    cls_dir = base / "whl" / "cls" / "ch_ppocr_mobile_v2.0_cls_infer"
-    return OCRModelPaths(base_dir=base, det_dir=det_dir, rec_dir=rec_dir, cls_dir=cls_dir)
-
-
 def _configure_windows_dll_search_path(app_base_dir: Path) -> None:
     """
     Windows 下 PaddlePaddle 依赖的 mkml.dll 等动态库，通常位于打包目录的：
@@ -74,11 +44,9 @@ def _configure_windows_dll_search_path(app_base_dir: Path) -> None:
 
     某些情况下动态库加载不会自动命中该路径（error code 126），需要显式加入 DLL 搜索路径。
     """
-
     if not sys.platform.startswith("win"):
         return
 
-    # Python 3.8+ on Windows 支持 os.add_dll_directory
     add_dll_dir = getattr(os, "add_dll_directory", None)
     internal_dir = app_base_dir / "_internal"
 
@@ -89,7 +57,6 @@ def _configure_windows_dll_search_path(app_base_dir: Path) -> None:
         app_base_dir,
     ]
 
-    # 同时设置 PATH，兼容不走 add_dll_directory 的加载路径
     path_parts = [os.environ.get("PATH", "")]
     for p in candidates:
         if p.exists():
@@ -97,82 +64,30 @@ def _configure_windows_dll_search_path(app_base_dir: Path) -> None:
                 try:
                     add_dll_dir(str(p))
                 except Exception:
-                    # add_dll_directory 在某些权限/路径场景可能失败，PATH 兜底
                     pass
             path_parts.insert(0, str(p))
     os.environ["PATH"] = ";".join([x for x in path_parts if x])
 
 
-def _check_infer_dir(dir_path: Path) -> bool:
-    """判断一个推理模型目录是否完整（至少包含 inference.pdmodel / inference.pdiparams）"""
-
-    return (dir_path / "inference.pdmodel").exists() and (dir_path / "inference.pdiparams").exists()
-
-
-def verify_offline_models_or_raise(model_paths: OCRModelPaths) -> None:
+def create_offline_ocr(models_base_dir: Path | None = None):
     """
-    校验离线模型是否存在。
+    创建 PaddleOCR 2.x 实例（PP-OCRv4 中文）。
 
-    设计选择：
-    - 直接抛异常：由上层（桌面/UI/CLI）决定如何展示错误
-    - 不允许缺失时继续初始化：避免触发 PaddleOCR 自动联网下载
+    首次运行会自动下载模型到 ~/.paddleocr/whl/。
     """
-
-    missing = []
-    if not _check_infer_dir(model_paths.det_dir):
-        missing.append(str(model_paths.det_dir))
-    if not _check_infer_dir(model_paths.rec_dir):
-        missing.append(str(model_paths.rec_dir))
-    if not _check_infer_dir(model_paths.cls_dir):
-        missing.append(str(model_paths.cls_dir))
-
-    if missing:
-        hint = (
-            "离线模型缺失，无法在离线模式启动。\n\n"
-            "缺失目录：\n- "
-            + "\n- ".join(missing)
-            + "\n\n"
-            "解决方式：\n"
-            "1) 在有网机器执行：python scripts/prepare_models.py --models-dir models\n"
-            "2) 将生成的 models/ 目录随 zip 包一起分发（与 exe 同级）"
-        )
-        raise FileNotFoundError(hint)
-
-
-def create_offline_ocr(models_base_dir: Path | None = None, show_log: bool = False):
-    """
-    创建 PaddleOCR（离线模式）。
-
-    关键点：
-    - 通过环境变量 PADDLE_OCR_BASE_DIR 将默认下载/查找目录指向随包 models/（与 paddleocr==2.10.0 行为匹配）
-    - 显式传入 det/rec/cls 的模型目录，避免目录不一致导致重复下载
-    - 如果模型缺失，提前报错，阻止联网下载
-    """
-
     log = logging.getLogger("post_ocr.ocr")
-    model_paths = get_ppocr_v4_ch_model_paths(models_base_dir=models_base_dir)
-    verify_offline_models_or_raise(model_paths)
 
-    # Windows 打包运行时，先配置 DLL 搜索路径，避免 mkml.dll 等加载失败（error code 126）
+    # Windows 打包运行时，先配置 DLL 搜索路径
     _configure_windows_dll_search_path(get_app_base_dir())
 
-    # 禁用联网检查（加快启动），并把默认 base_dir 指向随包 models/
-    os.environ["PADDLE_PDX_DISABLE_MODEL_SOURCE_CHECK"] = "True"
-    os.environ["PADDLE_OCR_BASE_DIR"] = str(model_paths.base_dir)
+    log.info("create_offline_ocr: importing paddleocr")
+    from paddleocr import PaddleOCR
 
-    # 延迟导入：确保环境变量在 paddleocr 模块加载前设置生效
-    log.info("create_offline_ocr: importing paddleocr (base_dir=%s)", str(model_paths.base_dir))
-    from paddleocr import PaddleOCR  # pylint: disable=import-error
-
-    # 注意：paddleocr==2.10.0 不支持 use_textline_orientation 这类 3.x pipeline 参数
-    log.info("create_offline_ocr: creating PaddleOCR(det=%s, rec=%s)", str(model_paths.det_dir), str(model_paths.rec_dir))
+    log.info("create_offline_ocr: creating PaddleOCR(lang=ch)")
     ocr = PaddleOCR(
         lang="ch",
-        show_log=show_log,
         use_angle_cls=False,
-        det_model_dir=str(model_paths.det_dir),
-        rec_model_dir=str(model_paths.rec_dir),
-        cls_model_dir=str(model_paths.cls_dir),
+        show_log=False,
     )
     log.info("create_offline_ocr: PaddleOCR created")
     return ocr