無法複製裁剪圖像（opencv墊）到位圖

Question

我有一個輸入圖像sourceMat。

作物位於（10,10）一個40×40的ROI：

Mat roi = sourceMat.submat(10, 50, 10, 50); 

創建大小40×40的一個位圖：

Bitmap tempBitmap = Bitmap.createBitmap(40, 40, thumbnail.getConfig()); 

轉換的墊爲位圖並在ImageView的設置：

Utils.matToBitmap(roi, tempBitmap); 
imageView.setImageBitmap(tempBitmap); 

而不是顯示裁剪的圖像，它顯示整個原始圖像縮小到40x40位圖。

我與openCVLibrary320和Android SDK版本工作25

Answer 1

替換：

Bitmap tempBitmap = Bitmap.createBitmap(40, 40, thumbnail.getConfig()); 

使用任一下列操作之一：

Bitmap.createBitmap(40, 40, Bitmap.Config.RGB_565); 
Bitmap.createBitmap(40, 40, Bitmap.Config.ARGB_8888); 

見documentation。

Answer 2

代碼工作正常，代碼會有小的變化。

private void showDialog(File pictureFile) { 
    // custom dialog 
    final Dialog dialog = new Dialog(this, android.R.style.Theme_Black_NoTitleBar_Fullscreen); 
    dialog.setContentView(R.layout.image_dialog); 
    dialog.setTitle("Image"); 
    // find the imageview and draw it! 
    ImageView image = (ImageView) dialog.findViewById(R.id.image); 
    Bitmap thumbnail; 
    try { 
     thumbnail = MediaStore.Images.Media.getBitmap(
       getContentResolver(), Uri.fromFile(pictureFile)); 
     cropImage(image, thumbnail); 
//   Imgproc.threshold(tmp, tmp, 60, 100, Imgproc.THRESH_BINARY); 
//   Utils.matToBitmap(tmp, image1); 
//   Imgproc.threshold(tmp, tmp, 1, 255, Imgproc.THRESH_OTSU); 
     //using floodfill and watershed to remove noise 
//   Mat mask = new Mat(tmp.rows() + 2, tmp.cols() + 2, CvType.CV_8UC1); 
//   Imgproc.floodFill(tmp, mask, new Point(tmp.cols() - 10, 10), new Scalar(255.0, 255.0, 255)); 
     image.setImageBitmap(thumbnail); 
    } catch (IOException e) { 
     e.printStackTrace(); 
    } 
    Button dialogButton = (Button) dialog.findViewById(R.id.dialogButtonOK); 
    // if button is clicked, close the custom dialog 
    dialogButton.setOnClickListener(new View.OnClickListener() { 
     @Override 
     public void onClick(View v) { 
      dialog.dismiss(); 
     } 
    }); 
    dialog.show(); 
} 

private void cropImage(ImageView image, Bitmap thumbnail) { 
    Mat src = new Mat(); 
    Utils.bitmapToMat(thumbnail, src); 
    //converts mat color 
    Imgproc.cvtColor(src, src, Imgproc.COLOR_RGBA2BGR); 
    Rect roi = new Rect(40, 100, 100, 120); 
    Mat cropped = new Mat(src, roi); 
    Bitmap tempBmp1 = Bitmap.createBitmap(100, 120, Bitmap.Config.ARGB_8888); 
    Utils.matToBitmap(cropped, tempBmp1); 
    image.setImageBitmap(tempBmp1); 
}