如何在opencv中裁剪矩形？

Question

我设法从捕获的图像中绘制两个矩形。 问题是，如何裁剪它们并单独保存它们，以便我可以在每个OCR中执行我的OCR？ 我尝试搜索，但找不到想要的东西...

到目前为止我所做的..

  Mat imageMat = new Mat();
  Mat resizeImg = new Mat();
  Mat hierarchy = new Mat();

  //Size(width,height)
  Size imageSize = new Size(1000,800); 

  Utils.bitmapToMat(image, imageMat);
  //Resize Image

  Imgproc.resize(imageMat,resizeImg,imageSize);

  //convert the resized image to bitmap
  image = Bitmap.createBitmap(resizeImg.cols(), resizeImg.rows(), 
  Bitmap.Config.ARGB_8888);

  //convert back to Mat
  Utils.bitmapToMat(image, imageMat);

  //Create rectangles
  Imgproc.rectangle(imageMat,new Point(0,150), new Point(500,250), new Scalar(255, 0, 255),1);
   Imgproc.rectangle(imageMat,new Point(0,500), new Point(650,650), new Scalar(255, 0, 255),1);

 //What I have tried doing
 Rect rectCrop = new Rect(0,150,500,250);
 Mat image_output= imageMat.submat(rectCrop);

 Bitmap Cropimage = Bitmap.createBitmap(imageMat.cols(), imageMat.rows(), Bitmap.Config.ARGB_8888);
Utils.bitmapToMat(Cropimage, image_output);

  //TODO: save only the content in the rectangles to MAT 

//testing purpose 
 Utils.matToBitmap(imageMat,image);
 imageView.setImageBitmap(image);

Answer 1

这是获取矩形裁剪图像的方法。

Rect rect = new Rect(x1, y1, x2, y2); 
Mat cropedMat = new Mat(mat, rect);

如果需要，可以将裁剪的垫转换为位图

Bitmap Cropedimage = Bitmap.createBitmap(cropedMat.cols(), cropedMat.rows(), Bitmap.Config.ARGB_8888);
Utils.matToBitmap(cropedMat, Cropedimage);