Android 与OpenCV454，实现模式匹配，色彩空间转换，QRcode识别

模板识别训练过程使用opencv3自带的模板训练工具

主要实现了1：使用直方图方式训练模板与模板匹配，见MainActivity

2：yuv格式图像转换为RGB，对接大疆设备，见yuvConvter

3：使用opencv多二维码识别与定位，见QRActivity

Android与OpenCV454项目demo-Android文档类资源-CSDN下载

模式识别代码:
public class TargetDetec {private static TargetDetec ins=null;private static boolean CVLOADED=false;private static final   String TAG="TargetDetec";public static Context context;CascadeClassifier cascade;/**** 单例方法* @return*/public  static  TargetDetec getInstance(){if(ins==null){ins=new TargetDetec();}if(!CVLOADED){ins.initOpencv();//初始opencv}return ins;}public TargetDetec(){if(CVLOADED){initTemplate();}else{initOpencv();}}/*** 初始化opencv*/public void initOpencv(){if (!OpenCVLoader.initDebug()) {Log.d(TAG, "Internal OpenCV library not found. Using OpenCV Manager for initialization");OpenCVLoader.initAsync(OpenCVLoader.OPENCV_VERSION, context, mLoaderCallback);} else {Log.d(TAG, "OpenCV library found inside package. Using it!");mLoaderCallback.onManagerConnected(LoaderCallbackInterface.SUCCESS);}}/*** yuv 数据转换为bitmap* @param buf* @return*/public Bitmap getBitmap(byte[] buf){if(cascade==null || !CVLOADED)return  null;Mat mat=new Mat(1080,1280, CvType.CV_8UC1);mat.put(0,0,buf);Mat img=new Mat();Imgproc.cvtColor(mat,img,Imgproc.COLOR_YUV2BGR_NV21);Bitmap bmp=Bitmap.createBitmap(1280,720, Bitmap.Config.ARGB_8888);Utils.matToBitmap(img,bmp);img.release();mat.release();return  bmp;}/*** 进行检测* @param buf* @return*/public List<Point> doDetect(byte[] buf){if(cascade==null || !CVLOADED)return  null;List<Point> ps=new ArrayList<Point>();//Mat yuv=new Mat(1080,1280, CvType.CV_8UC1);yuv.put(0,0,buf);Mat rgb=new Mat();Imgproc.cvtColor(yuv,rgb,Imgproc.COLOR_YUV2BGR_NV21);MatOfRect rst = new MatOfRect();//Log.i("start",System.currentTimeMillis()+"");cascade.detectMultiScale(rgb,rst,1.1,70,0);//Log.i("end",System.currentTimeMillis()+"");List<Rect> rects=rst.toList();for (Rect r: rects ) {Point p=new Point(r.x+r.width/2,r.y+r.height/2);ps.add(p);}return  ps;}private BaseLoaderCallback mLoaderCallback = new BaseLoaderCallback(context) {@Overridepublic void onManagerConnected(int status) {switch (status) {case LoaderCallbackInterface.SUCCESS:{Log.i(TAG, "OpenCV loaded successfully");CVLOADED=true;// mOpenCvCameraView.enableView();initTemplate();//必须在这里初始化opencv对象} break;default:{super.onManagerConnected(status);} break;}}};void initTemplate(){String path=getTemplate("cascade.xml");//初始化分类器cascade=new CascadeClassifier();Log.i("opencv","start load cascaed file "+path);cascade.load(path);Log.i("opencv","cascaed file load ok");}//assets文件到缓存路径private String getTemplate(String fileName){try {File cacheDir=context.getCacheDir();if (!cacheDir.exists()){cacheDir.mkdirs();}File outFile =new File(cacheDir,fileName);if (!outFile.exists()){boolean res=outFile.createNewFile();if (!res){return null;}}InputStream is=context.getAssets().open(fileName);FileOutputStream fos = new FileOutputStream(outFile);byte[] buffer = new byte[1024];int byteCount;while ((byteCount = is.read(buffer)) != -1) {fos.write(buffer, 0, byteCount);}fos.flush();is.close();fos.close();return outFile.getAbsolutePath();} catch (IOException e) {e.printStackTrace();}return null;}

色彩空间转换

public  class YuvConverter extends AppCompatActivity implements View.OnClickListener {ImageView imgview;@Overrideprotected void onCreate(Bundle savedInstanceState) {super.onCreate(savedInstanceState);setContentView(R.layout.activity_yuv_converter);imgview=findViewById(R.id.img);imgview.setOnClickListener(this);//loadyuv();}@Overridepublic void onResume(){super.onResume();TargetDetec.context=this;//context 赋值进去TargetDetec.getInstance();//初始化}void loadyuv(){try {InputStream is = getAssets().open("test.yuv");Log.i("yue","size"+is.available());byte[] buffer=new byte[is.available()];is.read(buffer);/*Bitmap bmp=TargetDetec.getInstance().getBitmap(buffer);imgview.setImageBitmap(bmp);*/List<Point> ps=TargetDetec.getInstance().doDetect(buffer);if(ps!=null){Log.i("yuv test",ps.size()+" points ");}else{Log.i("yuv error","load opencv error");}}catch (Exception e){e.printStackTrace();}}@Overridepublic void onClick(View view) {loadyuv();}

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Android 与OpenCV454，实现模式匹配，色彩空间转换，QRcode识别

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