Android调用OpenCV2.4.10实现二维码区域定位

package cn.hjq.android_capture; import java.io.BufferedWriter; import java.io.File; import java.io.FileOutputStream; import java.io.IOException; import java.io.OutputStreamWriter; import java.util.ArrayList; import java.util.List; import org.opencv.android.BaseLoaderCallback; import org.opencv.android.LoaderCallbackInterface; import org.opencv.android.OpenCVLoader; import org.opencv.core.*; import org.opencv.highgui.*; import org.opencv.imgproc.*; import org.opencv.utils.Converters; import android.graphics.Bitmap; import android.graphics.BitmapFactory; import android.graphics.Matrix; import android.hardware.Camera; import android.hardware.Camera.AutoFocusCallback; import android.hardware.Camera.Parameters; import android.hardware.Camera.PictureCallback; import android.os.Bundle; import android.os.Environment; import android.os.Handler; import android.app.Activity; import android.content.pm.ActivityInfo; import android.view.MotionEvent; import android.view.SurfaceHolder; import android.view.SurfaceHolder.Callback; import android.view.SurfaceView; import android.view.View; public class capture extends Activity { private SurfaceView picSV; private Camera camera; private String strPicPath; //OpenCV类库加载并初始化成功后的回调函数，在此我们不进行任何操作 private BaseLoaderCallback mLoaderCallback = new BaseLoaderCallback(this) { @Override public void onManagerConnected(int status) { switch (status) { case LoaderCallbackInterface.SUCCESS:{ } break; default:{ super.onManagerConnected(status); } break; } } }; @SuppressWarnings("deprecation") @Override protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); this.setRequestedOrientation(ActivityInfo.SCREEN_ORIENTATION_LANDSCAPE); setContentView(R.layout.main); picSV = (SurfaceView) findViewById(R.id.picSV); picSV.getHolder().setType(SurfaceHolder.SURFACE_TYPE_PUSH_BUFFERS); picSV.getHolder().addCallback(new MyCallback()); } private class MyCallback implements Callback{ //我们在SurfaceView创建的时候就要进行打开摄像头、设置预览取景所在的SurfaceView、设置拍照的参数、开启预览取景等操作 @Override public void surfaceCreated(SurfaceHolder holder) { try { camera = Camera.open();//打开摄像头 camera.setPreviewDisplay(picSV.getHolder());//设置picSV来进行预览取景 Parameters params = camera.getParameters();//获取照相机的参数 params.setPictureSize(800, 480);//设置照片的大小为800*480 params.setPreviewSize(800, 480);//设置预览取景的大小为800*480 params.setFlashMode("auto");//开启闪光灯 params.setJpegQuality(50);//设置图片质量为50 camera.setParameters(params);//设置以上参数为照相机的参数 camera.startPreview(); } catch (IOException e) { //开始预览取景，然后我们就可以拍照了 e.printStackTrace(); } } @Override public void surfaceChanged(SurfaceHolder holder, int format, int width, int height) { } @Override public void surfaceDestroyed(SurfaceHolder holder) { //当SurfaceView销毁时，我们进行停止预览、释放摄像机、垃圾回收等工作 camera.stopPreview(); camera.release(); camera = null; } } public void takepic(View v){ //在我们开始拍照前，实现自动对焦 camera.autoFocus(new MyAutoFocusCallback()); } private class MyAutoFocusCallback implements AutoFocusCallback{ @Override public void onAutoFocus(boolean success, Camera camera) { //开始拍照 camera.takePicture(null, null, null, new MyPictureCallback()); } } private class MyPictureCallback implements PictureCallback{ @Override public void onPictureTaken(byte[] data, Camera camera) { try { Bitmap bitmap = BitmapFactory.decodeByteArray(data, 0, data.length); Matrix matrix = new Matrix(); matrix.preRotate(90); bitmap = Bitmap.createBitmap(bitmap ,0,0, bitmap.getWidth(), bitmap.getHeight(),matrix,true); strPicPath = Environment.getExternalStorageDirectory()+"/1Zxing/"+System.currentTimeMillis()+".jpg"; FileOutputStream fos = new FileOutputStream( strPicPath ); bitmap.compress(Bitmap.CompressFormat.PNG, 100, fos); fos.close(); Handler mHandler = new Handler(); mHandler.post(mRunnable); camera.startPreview(); } catch (Exception e) { e.printStackTrace(); } } } public boolean onTouchEvent (MotionEvent event) { int Action = event.getAction(); if ( 1 == Action ) { camera.autoFocus(new MyAutoFocusCallback1()); } return true; } private class MyAutoFocusCallback1 implements AutoFocusCallback { @Override public void onAutoFocus(boolean success, Camera camera) { } } @Override public void onResume(){ super.onResume(); //通过OpenCV引擎服务加载并初始化OpenCV类库，所谓OpenCV引擎服务即是 //OpenCV_2.4.3.2_Manager_2.4_*.apk程序包，存在于OpenCV安装包的apk目录中 OpenCVLoader.initAsync(OpenCVLoader.OPENCV_VERSION_2_4_10, this, mLoaderCallback); } Runnable mRunnable = new Runnable() { public void run() { List<MatOfPoint> contours = new ArrayList<MatOfPoint>(); String strMissingTime = null; Mat srcColor = new Mat(), srcColorResize = new Mat(); Mat srcGray = new Mat(), srcGrayResize = new Mat(), srcGrayResizeThresh = new Mat(); srcGray = Highgui.imread(strPicPath, 0); srcColor = Highgui.imread(strPicPath, 1); Imgproc.resize(srcGray, srcGrayResize, new Size(srcGray.cols()*0.2,srcGray.rows()*0.2)); Imgproc.resize(srcColor, srcColorResize, new Size(srcGray.cols()*0.2,srcGray.rows()*0.2)); long start = System.currentTimeMillis(); //二值化加轮廓寻找 Imgproc.adaptiveThreshold(srcGrayResize, srcGrayResizeThresh, 255, Imgproc.ADAPTIVE_THRESH_GAUSSIAN_C, Imgproc.THRESH_BINARY, 35, 5); Imgproc.findContours(srcGrayResizeThresh, contours, new Mat(), Imgproc.RETR_LIST, Imgproc.CHAIN_APPROX_NONE); long end = System.currentTimeMillis(); strMissingTime = String.valueOf( end - start ); strMissingTime = strMissingTime + "\r"; //轮廓绘制 for ( int i = contours.size()-1; i >= 0; i-- ) { MatOfPoint2f NewMtx = new MatOfPoint2f( contours.get(i).toArray() ); RotatedRect rotRect = Imgproc.minAreaRect( NewMtx ); Point vertices[] = new Point[4]; rotRect.points(vertices); List<Point> rectArea = new ArrayList<Point>(); for ( int n = 0; n < 4; n ++ ) { Point temp = new Point(); temp.x = vertices[n].x; temp.y = vertices[n].y; rectArea.add(temp); } Mat rectMat = Converters.vector_Point_to_Mat(rectArea); double minRectArea = Imgproc.contourArea( rectMat ); Point center = new Point(); float radius[] = {0}; Imgproc.minEnclosingCircle(NewMtx, center, radius); if( Imgproc.contourArea( contours.get(i)) < 300 || Imgproc.contourArea( contours.get(i)) > 3000 || minRectArea < radius[0]*radius[0]*1.57 ) contours.remove(i); } Imgproc.drawContours(srcColorResize, contours, -1, new Scalar(255,0,0)); Highgui.imwrite(Environment.getExternalStorageDirectory()+"/1Zxing/" +System.currentTimeMillis()+"contour.jpg", srcColorResize); File file=new File(Environment.getExternalStorageDirectory()+"/1Zxing/","log.txt"); BufferedWriter out = null; try { out = new BufferedWriter(new OutputStreamWriter(new FileOutputStream(file, true))); out.write(strMissingTime); out.close(); } catch (Exception e) { e.printStackTrace(); } } }; }

相关阅读