java code to find whether the image is blur or not?

java code to find whether the image is blur image or quality image? I didn't get the result for the following code

try {
    //in = new URL("http://ift.tt/1zzfBWH").openConnection().getInputStream();
    in = new FileInputStream(new File("/home/sys2023/Desktop/images/12.jpg"));
    //run(null, in, imageInfo, verbose);
    //My sample code
    BufferedImage targetImg = ImageIO.read(new File("/home/sys2023/Desktop/images/LakeInc.jpg"));
    int[] pixels = new int[targetImg.getHeight() * targetImg.getWidth()];
    int maxLap = 16777216;
    for (int i = 0; i < pixels.length; i++) {
        if (pixels[i] > maxLap)
        maxLap = pixels[i];
    }

    int soglia = 6118750;      

    if (maxLap < soglia || maxLap == soglia) {
        System.out.println("Its a blur image");
    }else{
        System.out.println("Its not a blur image");
    }

} catch (IOException ex) {
    Logger.getLogger(ImageInfo.class.getName()).log(Level.SEVERE, null, ex);ex = null;
}finally{
    try {
        in.close();
    } catch (IOException ex) {
        Logger.getLogger(ImageInfo.class.getName()).log(Level.SEVERE, null, ex);ex = null;
    }
}