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I am doing subtraction of grayscale images. i want to keep negative values. but subtract method in opencv replace negative values with zeros. User Mat types are CV_32S, CV_32F.

public double corr2(Mat img1, Mat img2){

        Mat grayImg1,grayImg2;
        grayImg1=new Mat(300,300,CV_32S);
        grayImg2=new Mat(300,300,CV_32S);
        Imgproc.cvtColor(img1,grayImg1,COLOR_RGB2GRAY);
        Imgproc.cvtColor(img2,grayImg2,COLOR_RGB2GRAY);
        Scalar img1mean=Core.mean(grayImg1);
        Scalar img2mean=Core.mean(grayImg2);
        Core.subtract(grayImg1,img1mean,grayImg1);

thanks. it works

any alternative of corr2 in opencv to measure similarity of two images i have used corr2 in matlab. it shows similarity

subtract method replace negative values with zeros I am doing subtraction of grayscale images. i want to keep negative v

subtract method replace negative values with zeros I am doing subtraction of grayscale images. i want to keep negative v