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Hello,

I use an astronomy software that is call firecapture and you can add you own plug-in to the software.

To help, to learn and because plugin has to be in java, I try to add the BRISQUE quality image evaluation. https://www.learnopencv.com/image-quality-assessment-brisque/

I am stuck at the begining with an error:

Exception in thread "main" CvException [org.opencv.core.CvException: cv::Exception: OpenCV(4.2.0) C:\build\master_winpack-bindings-win64-vc14-static\opencv\modules\core\src\mathfuncs.cpp:1242: error: (-215:Assertion failed) depth == CV_32F || depth == CV_64F in function 'cv::pow'

/* premier essai de open CV et java*/

package HelloCv;

import org.opencv.core.Core;
import org.opencv.core.CvType;
import org.opencv.core.Mat;
import org.opencv.core.Size;
import org.opencv.imgcodecs.Imgcodecs;
import org.opencv.imgproc.Imgproc;

/**importation des classes**/

public class HelloCv {
    public static void main(String[] args){
        System.loadLibrary(Core.NATIVE_LIBRARY_NAME);
        String location = "resources/Poli.jpg";
        System.out.print("Convert the image at " + location + " in gray scale... ");
        Mat image = Imgcodecs.imread(location);
        Imgproc.cvtColor(image, image, Imgproc.COLOR_BGR2GRAY);
        Imgcodecs.imwrite("resources/Poli-gray.jpg", image);
        //nouvel objet de type mat
        Mat mu = new Mat(image.size(),CvType.CV_64F);
        //application d'un filtre gaussien et enregistrement dans l'objet mu
        Imgproc.GaussianBlur(image, mu, new Size(7, 7), 1.166);
        //mu square
        Mat mu_sq = new Mat(image.size(),CvType.CV_64F);
         mu_sq  = mu.mul(mu);
        // mu sigma
        Mat sigma = new Mat(image.size(), CvType.CV_64F);
        Mat sigma2 = new Mat(image.size(), CvType.CV_32F);
        sigma = image.mul(image);
        //gaussian blur
        Imgproc.GaussianBlur(sigma, sigma, new Size(7, 7), 1.166);
        Imgcodecs.imwrite("resources/Poli-gray2.jpg", sigma );
        Core.subtract(sigma,mu_sq,sigma);
        Core.sqrt(sigma, sigma2);
}
}

I have tried to put everything in CV_32F but the same error, I have tried with core.pow but the same issue...

Could you help me?

Thanks