如何使用坐标捕获android中的图像
我是Android新手，我想把问题摆在你面前，
我想在四个坐标之间捕获图像，如下所示。
首先，我将图像转换为位图，然后将其设置为相对布局的背景。 我知道这四个坐标。
那我怎么能得到框内的图像并将其设置为另一个布局作为背景。
伙计们，请让我从这个逻辑中解脱出来……
最后我找到了我的问题的解决方案，我和你分享了，
首先，这是基于+12水平的转换理论完成的。 好的，我的问题在“OpenCv for Android”的帮助下得到了解决
这是代码..
public class MainActivity extends Activity implements CvCameraViewListener2,OnTouchListener { Bitmap sourceBitmap,descBitmap,sourceBitmap1; ImageView view,view2; SurfaceView amSurfaceView ; Mat mRgba; private CameraBridgeViewBase mOpenCvCameraView; private BaseLoaderCallback mLoaderCallback = new BaseLoaderCallback(this) { @Override public void onManagerConnected(int status) { switch (status) { case LoaderCallbackInterface.SUCCESS: { Log.i("Yesssssssss", "OpenCV loaded successfully"); mOpenCvCameraView.enableView(); } break; default: { super.onManagerConnected(status); } break; } } }; @Override protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.activity_main); // initialise bitmap for crop is here Bitmap bitmap_source=BitmapFactory.decodeResource(getResources(), R.drawable.quadone); if(bitmap_source==null) Log.e("bitmap Null","nulllllll"); // these values should not exceed the limits of bitmap.. Log.e("Bitmap"," "+bitmap_source.getWidth()+" "+bitmap_source.getHeight()); sourceBitmap =BitmapFactory.decodeResource(getResources(), R.drawable.quadone); sourceBitmap1 =BitmapFactory.decodeResource(getResources(), R.drawable.quadone); descBitmap =BitmapFactory.decodeResource(getResources(), R.drawable.ic_launcher); view = (ImageView) findViewById(R.id.imageView1); view2=(ImageView) findViewById(R.id.imageView2); view.setImageBitmap(sourceBitmap1); view.setOnTouchListener(this); mOpenCvCameraView = (CameraBridgeViewBase) findViewById(R.id.color_blob_detection_activity_surface_view); mOpenCvCameraView.setCvCameraViewListener(this); Log.e("MAtt","Startttttttttmmmmmmmmmtttttttt"); sourceBitmap =bitmap_source; if (!OpenCVLoader.initDebug()) { // Handle initialization error } Mat inputMat = new Mat(); Mat outputMat = new Mat(); descBitmap=sourceBitmap; Utils.bitmapToMat(sourceBitmap, inputMat); List src_pnt = new ArrayList (); Point p0 = new Point(0, 0); src_pnt.add(p0); Point p1 = new Point(10, 100); src_pnt.add(p1); Point p2 = new Point(100, 125); src_pnt.add(p2); Point p3 = new Point(90, 20); src_pnt.add(p3); Mat startM = Converters.vector_Point2f_to_Mat(src_pnt); List dst_pnt = new ArrayList (); Point p4 = new Point(0.0, 0.0); dst_pnt.add(p4); Point p5 = new Point(0.0, sourceBitmap.getHeight()); dst_pnt.add(p5); Point p6 = new Point(sourceBitmap.getWidth(), sourceBitmap.getHeight()); dst_pnt.add(p6); Point p7 = new Point(sourceBitmap.getWidth(), 0); dst_pnt.add(p7); Mat endM = Converters.vector_Point2f_to_Mat(dst_pnt); Mat perspectiveTransform = Imgproc.getPerspectiveTransform(startM, endM); Size size = new Size(sourceBitmap.getWidth(), sourceBitmap.getHeight()); Scalar scalar = new Scalar(50.0); Imgproc.warpPerspective(inputMat, outputMat, perspectiveTransform, size, Imgproc.INTER_LINEAR + Imgproc.CV_WARP_FILL_OUTLIERS, Imgproc.BORDER_DEFAULT, scalar); Log.e("1=",""+inputMat.cols()+" "+inputMat.rows()); Log.e("outmat.."," "+outputMat.cols()+" "+outputMat.rows()); Utils.matToBitmap(outputMat, descBitmap); view2.setImageBitmap(descBitmap); // ram@san } @Override public void onCameraViewStarted(int width, int height) { // TODO Auto-generated method stub Log.e("onCameraViewStarted","onCameraViewStarted"); } @Override public void onCameraViewStopped() { // TODO Auto-generated method stub Log.e("onCameraViewStopped","onCameraViewStopped"); } @Override public Mat onCameraFrame(CvCameraViewFrame inputFrame) { // TODO Auto-generated method stub mRgba= new Mat(); Utils.bitmapToMat(sourceBitmap, mRgba); Utils.matToBitmap(mRgba, descBitmap); view2.setImageBitmap(sourceBitmap); return mRgba; } @Override public boolean onTouch(View v, MotionEvent event) { // TODO Auto-generated method stub return false; } } 如果有人有疑问请把它放在这里..
有一个快乐的编码，拉姆..
至于在坐标内获取图像
Bitmap croppedBmp = Bitmap.createBitmap(originalBmp, startx, starty, endx, endy);
这将创建一个像你之后的裁剪位图
这将（很可能）从4,5,6等点创建一个图像，您可以在ImageView上手动单击以获取该ImageView 。 这应该适用于超过4个选定的点。
@Override protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.activity_main); ImageView imageView = (ImageView) findViewById(R.id.img); compositeImageView = (ImageView) findViewById(R.id.imageView); Bitmap bitmap1=BitmapFactory.decodeResource(getResources(), R.drawable.drawable_android); Bitmap bitmap2=BitmapFactory.decodeResource(getResources(), R.drawable.drawable_android_cr); Bitmap resultingImage=Bitmap.createBitmap(320, 480, bitmap1.getConfig()); Canvas canvas = new Canvas(resultingImage); Paint paint = new Paint(); paint.setAntiAlias(true); Path path=new Path(); imageView.setOnTouchListener(new View.OnTouchListener() { @Override public boolean onTouch(View v, MotionEvent event) { if (event.getAction() == MotionEvent.ACTION_DOWN){ // textView.setText("Touch coordinates : " +String.valueOf(event.getX()) + "x" + String.valueOf(event.getY())); Log.e("X",String.valueOf(event.getX())+""); Log.e("y",String.valueOf(event.getY())+""); path.lineTo(String.valueOf(event.getX()), String.valueOf(event.getY())); } if(/*Touch count == 4 or 5 or 6 etc.*/){ canvas.drawPath(path, paint); paint.setXfermode(new PorterDuffXfermode(Mode.SRC_IN)); canvas.drawBitmap(bitmap2, 0, 0, paint); compositeImageView.setImageBitmap(resultingImage); return true; } } }); }