OpenCV mit Laplace-Formel Bild zu erkennen ist, verschwimmen oder nicht in Android

Question

In Ios wir können:

Is there a way to detect if an image is blurry?

Ich weiß nicht, wie Bild zu erkennen ist unscharf oder nicht in Android oder Java?

Answer 1

private void opencvProcess() { 
    BitmapFactory.Options options = new BitmapFactory.Options(); 
    options.inDither = true; 
    options.inPreferredConfig = Bitmap.Config.ARGB_8888; 
    Bitmap image = decodeSampledBitmapFromFile(picFilePath, options, 2000, 2000); 
    int l = CvType.CV_8UC1; //8-bit grey scale image 
    Mat matImage = new Mat(); 
    Utils.bitmapToMat(image, matImage); 
    Mat matImageGrey = new Mat(); 
    Imgproc.cvtColor(matImage, matImageGrey, Imgproc.COLOR_BGR2GRAY); 

    Bitmap destImage; 
    destImage = Bitmap.createBitmap(image); 
    Mat dst2 = new Mat(); 
    Utils.bitmapToMat(destImage, dst2); 
    Mat laplacianImage = new Mat(); 
    dst2.convertTo(laplacianImage, l); 
    Imgproc.Laplacian(matImageGrey, laplacianImage, CvType.CV_8U); 
    Mat laplacianImage8bit = new Mat(); 
    laplacianImage.convertTo(laplacianImage8bit, l); 

    Bitmap bmp = Bitmap.createBitmap(laplacianImage8bit.cols(), laplacianImage8bit.rows(), Bitmap.Config.ARGB_8888); 
    Utils.matToBitmap(laplacianImage8bit, bmp); 
    int[] pixels = new int[bmp.getHeight() * bmp.getWidth()]; 
    bmp.getPixels(pixels, 0, bmp.getWidth(), 0, 0, bmp.getWidth(), bmp.getHeight()); // bmp为轮廓图 

    int maxLap = -16777216; // 16m 
    for (int pixel : pixels) { 
     if (pixel > maxLap) 
      maxLap = pixel; 
    } 

    int soglia = -6118750; 
    if (maxLap <= soglia) { 
     System.out.println("is blur image"); 
    } 
    soglia += 6118750; 
    maxLap += 6118750; 
    LogUtil.log("图片位置=" + picFilePath 
      + "\nimage.w=" + image.getWidth() + ", image.h=" + image.getHeight() 
      + "\nmaxLap= " + maxLap + "(清晰范围:0~6118750)" 
      + "\n" + Html.fromHtml("<font color='#eb5151'><b>" + (maxLap <= soglia ? "模糊" : "清晰") + "</b></font>")); 
    opencvEnd = true; 
    isBlur = maxLap <= soglia; 
}