[问答]

如何移植ncnn +nanodet？

998 RK3399

问答对人有帮助，内容完整，我也想知道答案 0 如何移植ncnn +nanodet？ 0
2022-3-7 07:38:03　　评论淘帖0 邀请回答您可以邀请以下用户，快速回答问题 × liutiefu 该类别下有 26 个回答。邀请回答 ze55me 该类别下有 20 个回答。邀请回答 tigerwang711 该类别下有 20 个回答。邀请回答 zhuzb0754 该类别下有 19 个回答。邀请回答杀狼000 该类别下有 19 个回答。邀请回答 YYXIAO 该类别下有 18 个回答。邀请回答冰箱洗衣机该类别下有 18 个回答。邀请回答 CDCNKA 该类别下有 17 个回答。邀请回答 jjll652 该类别下有 17 个回答。邀请回答河神大人该类别下有 17 个回答。邀请回答 mede1001 该类别下有 17 个回答。邀请回答安德森大该类别下有 17 个回答。邀请回答 YOYOOO 该类别下有 16 个回答。邀请回答麻酱该类别下有 16 个回答。邀请回答世态薄凉该类别下有 16 个回答。邀请回答熊本熊该类别下有 16 个回答。邀请回答 wang21cj 该类别下有 15 个回答。邀请回答 dfgsdf 该类别下有 15 个回答。邀请回答 szj0213 该类别下有 15 个回答。邀请回答梅利号该类别下有 15 个回答。邀请回答举报卞轮辉相关推荐 • 如何在一块全新的全志D1开发板上跑个ncnn神经网络推理框架的demo？ 1792 • RK3399的NCNN该怎样去检测并开发呢 1974 • 在xr806板子上如何实现用ncnn跑神经网络mnis呢 1203 • 如何在RK3308嵌入式开发板上使用ncnn部署mobilenetv2_ssdlite模型呢 1045 • 对NCNN要做哪些修改才能获得和Android一样的运行效果呢 1826 • 如何实现基于ncnn的RK3399上的mtcnn人脸检测？ 1981 • RK3399Pro是怎样去移植Tencent的mtcnn人脸检测算法的 833 • 如何将常用接口封装成类似于NCNN的接口调用形式？ 1137 • linux移植 2295 • Nano移植原理不看后悔 1520 1个回答

基本思想：最近天降一块RK3399 pro开发板(android系统)，摄像头是USB直连，本来是听到rk3399 以为就可以使用Tengine,想测试一番；后来和虫叔交流才知道。rk3399 没有NPU支持，即使是rk3399 pro 的android系统也需要官方给android的api接口才能调用npu【和客户沟通，客户着急使用，可以先给demo,后在和厂家索要android的npu sdk 唉坑】；同时偶然间也发现另一个小组用的android系统也是搭载在rk3399芯片上，所以先搞一下简单移植一下ncnn +nanodet移植吧；

（1）首先想着白嫖nihui大佬的代码：GitHub - nihui/ncnn-android-nanodet 移植帧获取~ 然而发现无法在这个RK3399 上运行，个人理解是因为：这里并不是直接从摄像头回去的N21编码数据，而u***摄像头直连开发板，需要使用uvc驱动检测dev设备去获取USB接口信息，而读取帧；

（2）网上搜索源码发现：github源码分为两种一种是otg转u***板子插槽，然后在外接摄像头，另一种是直连USB摄像头

开始痛苦的原理学习了了这个大神的代码 GitHub - saki4510t/UVCCamera: library and sample to access to UVC web camera on non-rooted Android device ；[花了一个周我真的太菜了 ~~~]修改了这个大佬的代码GitHub - o0olele/UVCcamera-Opencv: a simple example using opencv in UVCcamera；因为大佬们的代码没有使用C++ 的JNI构建工程，逐进行自己新建工程，去掉无用的包和魔改一下 (注 GitHub - allencheung2018/SwitchU***CameraAndroid: Usage of USB camera; Customize grids and lines when previewing; 这个大神的代码也挺好但是不会魔改~~~)

魔改之后，我踢掉了原作者的opencv静态包，导入了cv的动态包（这里可以使用up的静态包，可以我还是喜欢实践不自己动手搞能用的东西不太睡得着），引入了两个arr文件夹包

把我这个代码简单改了一下 6、Android配置opencv4.5及C++ Native Yolo4.0模型检测_sxj731533730-CSDN博客；因为这个工程是建立在Native JNI C++基础上; [下图为rk3399开发板 ]

  整了个测试可用（android系统+rk3399+USB直连摄像头<直播芯片是FPGA驱动的摄像头 >）demo ；普通摄像头也可以使用

(3)、修改的部分代码片段

gradle修改片段

repositories {
      flatDir {
         dirs 'libs'
      }
}

dependencies {
implementation fileTree(include: ['*.jar'], dir: 'libs')
implementation 'junit:junit:4.12'
//noinspection GradleCompatible
implementation 'com.android.support:appcompat-v7:28.0.0'
implementation project(':OpenCVLib4.4.0')
implementation 'com.android.support.constraint:constraint-layout:1.1.3'
implementation(name: 'libuvccamera', ext: 'aar')
implementation(name: 'u***CameraCommon', ext: 'aar')
implementation("com.serenegiant:common:1.5.20") {
      exclude module: 'support-v4'
}
}

Mainactivity修改片段

package com.sxj731533730.rk3399;
import android.content.res.AssetManager;
import android.graphics.Bitmap;
import org.opencv.android.Utils;
import org.opencv.core.CvType;
import org.opencv.core.Mat;
import org.opencv.core.Point;
import org.opencv.core.Rect;
import org.opencv.core.Scalar;
import org.opencv.core.Size;
import org.opencv.imgcodecs.Imgcodecs;
import android.graphics.SurfaceTexture;
import android.hardware.u***.U***Device;
import android.os.Bundle;
import android.os.Environment;
import android.util.Log;
import android.view.Surface;
import android.view.View;
import android.view.View.OnClickListener;
import android.view.Window;
import android.view.WindowManager;
import android.widget.ImageButton;
import android.widget.ImageView;
import android.widget.Toast;

import com.serenegiant.common.BaseActivity;
import com.serenegiant.u***.CameraDialog;
import com.serenegiant.u***.IFrameCallback;
import com.serenegiant.u***.USBMonitor;
import com.serenegiant.u***.USBMonitor.OnDeviceConnectListener;
import com.serenegiant.u***.USBMonitor.U***ControlBlock;
import com.serenegiant.u***.UVCCamera;
import com.serenegiant.u***cameracommon.UVCCameraHandler;
import com.serenegiant.widget.CameraViewInterface;

import org.opencv.android.BaseLoaderCallback;
import org.opencv.android.LoaderCallbackInterface;
import org.opencv.android.OpenCVLoader;
import org.opencv.imgproc.Imgproc;

import java.io.File;
import java.io.FileNotFoundException;
import java.io.FileOutputStream;
import java.io.IOException;
import java.nio.ByteBuffer;
import java.util.List;

import static org.opencv.imgcodecs.Imgcodecs.imread;
import static org.opencv.imgcodecs.Imgcodecs.imwrite;
import static org.opencv.imgproc.Imgproc.FONT_HERSHEY_SIMPLEX;
import static org.opencv.imgproc.Imgproc.getTextSize;
import static org.opencv.imgproc.Imgproc.putText;
import static org.opencv.imgproc.Imgproc.rectangle;

public final class MainActivity extends BaseActivity implements CameraDialog.CameraDialogParent {
static {
      System.loadLibrary("native-lib");
}
private static final boolean DEBUG = true;       // TODO set false on release
private static final String TAG = "MainActivity";

/**
   * 操作锁
   */
private final Object mSync = new Object();

/**
   * set true if you want to record movie using MediaSurfaceEncoder
   * (writing frame data into Surface camera from MediaCodec
   *  by almost same way as USBCameratest2)
   * set false if you want to record movie using MediaVideoEncoder
   */
private static final boolean USE_SURFACE_ENCODER = false;

/**
   * preview resolution(width)
   * if your camera does not support specific resolution and mode,
   * {@link UVCCamera#setPreviewSize(int, int, int)} throw exception
   */
private static final int PREVIEW_WIDTH = 1280; // 1280
/**
   * preview resolution(height)
   * if your camera does not support specific resolution and mode,
   * {@link UVCCamera#setPreviewSize(int, int, int)} throw exception
   */
private static final int PREVIEW_HEIGHT = 720; //720
/**
   * preview mode
   * if your camera does not support specific resolution and mode,
   * {@link UVCCamera#setPreviewSize(int, int, int)} throw exception
   * 0:YUYV, other:MJPEG
   */
private static final int PREVIEW_MODE = 0; // YUV

protected static final int SETTINGS_HIDE_DELAY_MS = 2500;

/**
   * for accessing USB
   */
private USBMonitor mUSBMonitor;
/**
   * Handler to execute camera related methods sequentially on private thread
   */
private UVCCameraHandler mCameraHandler;
/**
   * for camera preview display
   */
private CameraViewInterface mUVCCameraView;
/**
   * for open&start / stop&close camera preview
   */
private ImageButton mCameraButton;
private ImageView mImageView;
private boolean isScaling = false;
private boolean isInCapturing = false;

private int[][] capture_solution = {{640,480}, {800,600},{1024,768}, {1280,1024}};
private int mCaptureWidth = capture_solution[0][0];
private int mCaptureHeight = capture_solution[0][1];

/**
   * opencv的一个抽象类，为了支持opencv与app之间的相互作用，
   * 该类声明了一个callback，在opencv  manager之后执行，这个回调是为了使opencv在合适的地方进行初始化
   */
private BaseLoaderCallback mLoaderCallback = new BaseLoaderCallback(this) {
      @Override
      public void onManagerConnected(int status) {
         switch (status) {
            case LoaderCallbackInterface.SUCCESS:
            {
                  Log.i(TAG, "OpenCV loaded successfully");
            } break;
            default:
            {
                  super.onManagerConnected(status);
            } break;
         }
      }
};

private String[] readAsset() {
      AssetManager am = this.getAssets();
      String[] pathStr = null;
      try {
         // 列出files目录下的文件
         pathStr = am.list("");//存放模型的问位置的
      } catch (IOException e) {
         e.printStackTrace();
      }
      return pathStr;
}
private String getFileExtension(String filename) {
      if ((filename != null) && (filename.length() > 0)) {
         String string = filename.trim();
         int index = filename.lastIndexOf(".");
         if (index > 0 && index < string.length() - 1) {
            return string.substring(index + 1);
         }
      }
      return filename;
}

@Override
protected void onCreate(final Bundle savedInstanceState) {
      super.onCreate(savedInstanceState);
      Log.v(TAG, "onCreate:");

      String ,;
      String []DirFile=readAsset();
      for(int i=0;i
      {
         if(getFileExtension(DirFile).equals("param"))  paramFile=readAsset();
         else if(getFileExtension(DirFile).equals("bin")) binFile=readAsset();
      }
      String []labelStringName={"towerhead", "insulator"};
      int  targetSize=320;
      float probThreshold=0.3f,nmsThreshold=0.3f;
      initModel(this.getAssets(),paramFile,binFile,labelStringName,targetSize,probThreshold,nmsThreshold); //初始

      getWindow().addFlags(WindowManager.LayoutParams.FLAG_KEEP_SCREEN_ON);
      requestWindowFeature(Window.FEATURE_NO_TITLE);
      getWindow().setFlags(WindowManager.LayoutParams.FLAG_FULLSCREEN,
            WindowManager.LayoutParams.FLAG_FULLSCREEN);

      setContentView(R.layout.activity_main);
      mCameraButton = findViewById(R.id.imageButton);
      mCameraButton.setOnClickListener(mOnClickListener);

      mImageView = (ImageView)findViewById(R.id.imageView);

      mCaptureWidth = capture_solution[0][0];
      mCaptureHeight = capture_solution[0][1];
      bitmap = Bitmap.createBitmap(mCaptureWidth, mCaptureHeight, Bitmap.Config.RGB_565);

      final View view = findViewById(R.id.camera_view);
      mUVCCameraView = (CameraViewInterface)view;
      mUVCCameraView.setAspectRatio(PREVIEW_WIDTH / (float)PREVIEW_HEIGHT);

      synchronized (mSync) {
         mUSBMonitor = new USBMonitor(this, mOnDeviceConnectListener);
         mCameraHandler = UVCCameraHandler.createHandler(this, mUVCCameraView,
                  USE_SURFACE_ENCODER ? 0 : 1, PREVIEW_WIDTH, PREVIEW_HEIGHT, PREVIEW_MODE);
      }
}

@Override
protected void onStart() {
      super.onStart();
      Log.v(TAG, "onStart:");
      if (!OpenCVLoader.initDebug()) {
         Log.d(TAG, "Internal OpenCV library not found. Using OpenCV Manager for initialization");
         OpenCVLoader.initAsync(OpenCVLoader.OPENCV_VERSION_3_0_0, this, mLoaderCallback);
      } else {
         Log.d(TAG, "OpenCV library found inside package. Using it!");
         mLoaderCallback.onManagerConnected(LoaderCallbackInterface.SUCCESS);
      }

      synchronized (mSync) {
         mUSBMonitor.register();
      }
      if (mUVCCameraView != null) {
         mUVCCameraView.onResume();
      }
}

@Override
protected void onStop() {
      Log.v(TAG, "onStop:");
      synchronized (mSync) {
         mCameraHandler.close();       // #close include #stopRecording and #stopPreview
         mUSBMonitor.unregister();
      }
      if (mUVCCameraView != null)
         mUVCCameraView.onPause();
      super.onStop();
}

@Override
public void onDestroy() {
      Log.v(TAG, "onDestroy:");
      synchronized (mSync) {
         if (mCameraHandler != null) {
            mCameraHandler.setPreviewCallback(null); //zhf
            mCameraHandler.release();
            mCameraHandler = null;
         }
         if (mUSBMonitor != null) {
            mUSBMonitor.destroy();
            mUSBMonitor = null;
         }
      }
      super.onDestroy();
}

/**
   * event handler when click camera / capture button
   */
private final OnClickListener mOnClickListener = new OnClickListener() {
      @Override
      public void onClick(final View view) {
         synchronized (mSync) {
            if ((mCameraHandler != null) && !mCameraHandler.isOpened()) {
                  CameraDialog.showDialog(MainActivity.this);
            } else {
                  mCameraHandler.close();
            }
         }
      }
};

private void startPreview() {
      synchronized (mSync) {
         if (mCameraHandler != null) {
            final SurfaceTexture st = mUVCCameraView.getSurfaceTexture();
            /**
               * 由于surfaceview由另一个线程处理，这里使用消息处理机制
               * 对Frame进行回调处理
               */
            mCameraHandler.setPreviewCallback(mIFrameCallback);
            mCameraHandler.startPreview(new Surface(st));
         }
      }
      updateItems();
}

private final OnDeviceConnectListener mOnDeviceConnectListener = new OnDeviceConnectListener() {
      @Override
      public void onAttach(final U***Device device) {
         Toast.makeText(MainActivity.this, "USB_DEVICE_ATTACHED", Toast.LENGTH_SHORT).show();
      }

      @Override
      public void onConnect(final U***Device device, final U***ControlBlock ctrlBlock, final boolean createNew) {
         if (DEBUG) Log.v(TAG, "onConnect:");
         synchronized (mSync) {
            if (mCameraHandler != null) {
                  mCameraHandler.open(ctrlBlock);
                  startPreview();
                  updateItems();
            }
         }
      }

      @Override
      public void onDisconnect(final U***Device device, final U***ControlBlock ctrlBlock) {
         if (DEBUG) Log.v(TAG, "onDisconnect:");
         synchronized (mSync) {
            if (mCameraHandler != null) {
                  queueEvent(new Runnable() {
                     @Override
                     public void run() {
                        try{
                              // maybe throw java.lang.IllegalStateException: already released
                              mCameraHandler.setPreviewCallback(null); //zhf
                        }
                        catch(Exception e){
                              e.printStackTrace();
                        }
                        mCameraHandler.close();
                     }
                  }, 0);
            }
         }
      }
      @Override
      public void onDettach(final U***Device device) {
         Toast.makeText(MainActivity.this, "USB_DEVICE_DETACHED", Toast.LENGTH_SHORT).show();
      }

      @Override
      public void onCancel(final U***Device device) {
      }
};

/**
   * to access from CameraDialog
   * @return
   */
@Override
public USBMonitor getUSBMonitor() {
      synchronized (mSync) {
         return mUSBMonitor;
      }
}

@Override
public void onDialogResult(boolean canceled) {
      if (DEBUG) Log.v(TAG, "onDialogResult:canceled=" + canceled);
}

//================================================================================
private boolean isActive() {
      return mCameraHandler != null && mCameraHandler.isOpened();
}

private boolean checkSupportFlag(final int flag) {
      return mCameraHandler != null && mCameraHandler.checkSupportFlag(flag);
}

private int getValue(final int flag) {
      return mCameraHandler != null ? mCameraHandler.getValue(flag) : 0;
}

private int setValue(final int flag, final int value) {
      return mCameraHandler != null ? mCameraHandler.setValue(flag, value) : 0;
}

private int resetValue(final int flag) {
      return mCameraHandler != null ? mCameraHandler.resetValue(flag) : 0;
}

/**
   * 利用Activity.runOnUiThread(Runnable)把更新ui的代码创建在Runnable中，
   * 然后在需要更新ui时，把这个Runnable对象传给Activity.runOnUiThread(Runnable)
   */
private void updateItems() {
      runOnUiThread(mUpdateItemsOnUITask, 100);
}

private final Runnable mUpdateItemsOnUITask = new Runnable() {
      @Override
      public void run() {
         if (isFinishing()) return;
         final int visible_active = isActive() ? View.VISIBLE : View.INVISIBLE;
         mImageView.setVisibility(visible_active);
      }
};

// if you need frame data as byte array on Java side, you can use this callback method with UVCCamera#setFrameCallback
// if you need to create Bitmap in IFrameCallback, please refer following snippet.
private Bitmap bitmap = null;//Bitmap.createBitmap(640, 480, Bitmap.Config.RGB_565);
private final Bitmap srcBitmap = Bitmap.createBitmap(PREVIEW_WIDTH, PREVIEW_HEIGHT, Bitmap.Config.RGB_565);
private String WarnText;

private final IFrameCallback mIFrameCallback = new IFrameCallback() {
      @Override
      public void onFrame(final ByteBuffer frame) {
         frame.clear();
         if(!isActive() || isInCapturing){
            return;
         }
         if(bitmap == null){
            Toast.makeText(MainActivity.this, "错误：Bitmap为空", Toast.LENGTH_SHORT).show();
            return;
         }
         /**
         * 这里进行opencv操作
         * srcBitmap:源
         * bitmap:处理后
         */
         synchronized (bitmap) {
            srcBitmap.copyPixelsFromBuffer(frame);
            WarnText = "";

            if(bitmap.getWidth() != mCaptureWidth || bitmap.getHeight() != mCaptureHeight){
                  bitmap = Bitmap.createBitmap(mCaptureWidth, mCaptureHeight, Bitmap.Config.RGB_565);
            }

            Mat rgbMat = new Mat();

            bitmap = Bitmap.createBitmap(srcBitmap.getWidth(), srcBitmap.getHeight(), Bitmap.Config.RGB_565);
            Utils.bitmapToMat(srcBitmap, rgbMat);//convert original bitmap to Mat, R G B.
            //imwrite("/sdcard/mat.jpg",rgbMat);
            Utils.matToBitmap(rgbMat, bitmap); //convert mat to bitmap

            Mat mat=new Mat();
            Imgproc.cvtColor(rgbMat, mat, Imgproc.COLOR_BGR2RGB);
            //创建一个空的bitmap
            Bitmap processBitmap = Bitmap.createBitmap(mat.width(), mat.height(), Bitmap.Config.ARGB_8888);
            //mat转bitmap
            Utils.matToBitmap(mat, processBitmap);

            //saveImage(bitmap);
            long startTime = System.currentTimeMillis(); //起始时间
            List infoItem=detectFrame( processBitmap);
            long endTime = System.currentTimeMillis(); //结束时间
            long runTime = endTime - startTime;
            int fps = (int)(1.f / runTime * 1000);
            Log.i("test", String.format("方法使用时间 %d ms", runTime));
            Log.i("test", "帧率 "+fps );
            Utils.bitmapToMat(srcBitmap, rgbMat);//convert original bitmap to Mat, R G B.

            Log.i(TAG, "infoItem.size()=  "+infoItem.size());
            for (int i=0;i                   detectFrame object = infoItem.get(i);
                  float minX =  object.getxMin();
                  float minY =  object.getyMin();
                  float width = object.getwidth();
                  float height =  object.getheight();
                  float conf=  object.getConfidence();
                  int labelId =  object.getLabelId();
                  String labelName = object.getLabelName();
                  Log.i(TAG, "labelName=  "+labelName);

                  int[] baseLine = new int[1];
               baseLine[0]=0;
               Size label_size = getTextSize(String.valueOf(conf)+"%", FONT_HERSHEY_SIMPLEX, 1, 1, baseLine);

               int x = (int)minX;
            int y = (int) ((int)minY - label_size.height - baseLine[0]);
            if (y < 0)
               y = 0;
            if (x + label_size.width > rgbMat.cols())
               x = (int) (rgbMat.cols() - label_size.width);
            putText(rgbMat, String.valueOf(conf)+"%", new Point(x, y + label_size.height),FONT_HERSHEY_SIMPLEX, 0.5, new Scalar(0, 0, 0));

               putText(rgbMat, labelName,  new Point(x,y+1.8*label_size.height), FONT_HERSHEY_SIMPLEX, 0.5, new Scalar(0, 0, 0));
                  rectangle(rgbMat,
                        new Point(minX,minY),
                        new Point(minX+width, minY+height),
                        new Scalar(255, 0, 0), 1, 8);

            }
            Utils.matToBitmap(rgbMat, bitmap); //convert mat to bitmap

         }

         mImageView.post(mUpdateImageTask);
      }
};
private static void saveImage(Bitmap bmp) {
      File appDir = new File(Environment.getExternalStorageDirectory(), "");
      if (!appDir.exists()) {
         appDir.mkdir();
      }
      String fileName = System.currentTimeMillis() + ".jpg";
      File file = new File(appDir, fileName);
      try {
         FileOutputStream fos = new FileOutputStream(file);
         bmp.compress(Bitmap.CompressFormat.JPEG, 100, fos);
         fos.flush();
         fos.close();
      } catch (FileNotFoundException e) {
         e.printStackTrace();
      } catch (IOException e) {
         e.printStackTrace();
      }
}

private final Runnable mUpdateImageTask = new Runnable() {
      @Override
      public void run() {
         synchronized (bitmap) {
            mImageView.setImageBitmap(bitmap);
         }
      }
};

public native void initModel(AssetManager manager,
                              String modelConfiguration,
                              String modelBinary,
                              String[] labelStringName,
                              int  targetSize,
                              float probThreshold,
                              float nmsThreshold);
public native List detectFrame(Bitmap bitmap);

}
然后就可以愉快的写JNI模块了~

（4）然后是移植一下检测代码；主要自己构建了一个cv工程，然后引入了两个arr包，修改了帧处理接口和处理接口

这里也简单放一下代码片段 JNI

extern "C"
JNIEXPORT void JNICALL
Java_com_sxj731533730_rk3399_MainActivity_initModel(JNIEnv *env, jobject thiz, jobject manager,
                                                jstring model_configuration,
                                                jstring model_binary,
                                                jobjectArray label_string_name,
                                                jint targetsize, jfloat probthreshold,
                                                jfloat nmsthreshold) {

// TODO: implement initModel()
AAssetManager* mgr = AAssetManager_fromJava(env, manager);

// 类别信息
class_names.clear();
vector().swap(class_names);
jsize size = env->GetArrayLength(label_string_name);
for (int i = 0; i < size; i++) {
      jstring obj = (jstring) env->GetObjectArrayElement(label_string_name, i);
      string sstr = (string) env->GetStringUTFChars(obj, NULL);//得到字符串
      class_names.push_back(sstr);
}

target_size=targetsize;
prob_threshold = probthreshold;
nms_threshold = nmsthreshold;
//取模型配置文件
const char *ptr_modelConfiguration = NULL;

if (model_configuration) {
ptr_modelConfiguration = (env)->GetStringUTFChars(model_configuration, 0);
}
   //取模型文件
const char *ptr_modelBinary = NULL;

   if (model_binary) {
   ptr_modelBinary = (env)->GetStringUTFChars(model_binary, 0);
   }
nanodet.opt.use_vulkan_compute = true;
// nanodet.opt.use_bf16_storage = true;
nanodet.load_param(mgr, ptr_modelConfiguration);
nanodet.load_model(mgr,ptr_modelBinary);

}

extern "C"
JNIEXPORT jobject  JNICALL
Java_com_sxj731533730_rk3399_MainActivity_detectFrame(JNIEnv *env, jobject thiz,
                                                jobject bitmap) {

AndroidBitmapInfo inBmpInfo;
void *inPixelsAddress;
int ret;
if ((ret = AndroidBitmap_getInfo(env, bitmap, &inBmpInfo)) < 0) {
      return NULL;
}
if ((ret = AndroidBitmap_lockPixels(env, bitmap, &inPixelsAddress)) < 0) {
      return NULL;
}
Mat rgbaImage;
rgbaImage.create(inBmpInfo.height, inBmpInfo.width, CV_8UC4);
Mat inMat(inBmpInfo.height, inBmpInfo.width, CV_8UC4, inPixelsAddress);

cvtColor(inMat, rgbaImage, COLOR_mRGBA2RGBA);
Mat frame;
frame.create(inBmpInfo.height, inBmpInfo.width, CV_8UC3);
cvtColor(rgbaImage, frame, COLOR_RGBA2BGR);

//cv::imwrite("a.jpg",rgbaImage);

std::vector

2022-3-7 10:08:18 评论

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