blur with mak

gistfile1.txt

    Mat m = imread("g:/lib/opencv/samples/data/lena.jpg", IMREAD_GRAYSCALE);

    Mat mask = Mat::zeros(m.size(), CV_8UC1), maskBlur, mc;
    // mask is a contour
    vector<vector<Point>> c = { {Point(200,100),Point(250,100),Point(350,250),Point(350,300),Point(150,350) } };
    drawContours(mask, c, 0, Scalar(255), -1);
    Mat negMask;
    // neg mask
    bitwise_not(mask, negMask);
    Mat md, mdBlur, mdint;

    m.copyTo(md);

    // All pixels outside mask set to 0
    md.setTo(0, negMask);
    imshow("mask image", md);
    // Convert image to int
    md.convertTo(mdint, CV_32S);
    Size fxy(41, 41);
    blur(mdint, mdBlur, fxy);
    mask.convertTo(maskBlur, CV_32S);

    blur(maskBlur, maskBlur, fxy);
    Mat mskB;
    mskB.setTo(1, negMask);
    Mat m1, m2, maskFloat,mweight;
    maskBlur.convertTo(maskFloat, CV_32F,1/255.);
    pow(maskFloat,4, maskFloat);
    normalize(maskFloat, mweight, 1, NORM_MINMAX);
    multiply(mdBlur, 1 - maskFloat, m1, 1, CV_32F);
    multiply(m, maskFloat, m2,1, CV_32F);
    mc = (m1 + m2);
    mc.convertTo(mc, CV_8U);
//    resize(mc, mc, Size(), 0.5, 0.5);
    imshow("Blur with mask", mc);
    imwrite("testBlur.png", mc);
    waitKey();