如何在灰色区域中增加明亮的像素？ OpenCV C ++

Question

How can I grow bright pixel in grey region?

Input: image

Output: image

Answer 1

My answer is somewhat less helpful than my usual efforts, but it is hard to get up enthusiasm for questions with so little effort...

You can solve your issue by using OpenCV findContours() - documentation here . You will need to be sure to use the retrieval mode CV_RETR_TREE .

You then need to write a loop, iterating through all the contours found. In the loop, you need to look for a contour that:

• a) has a colour of white and,
• b) which has a parent with colour grey .

There is a decent explanation of how the hierarchy works here .

Answer 2

Mat im = imread("ask.png", 0);
Mat mat;
mat = im==255;
    findContours( mat, contours, hierarchy, RETR_TREE, CHAIN_APPROX_SIMPLE);
    for( size_t i = 0; i< contours.size(); i++ )
      {
        floodFill(mat, contours[i].at(0), 255, 0, Scalar(128), Scalar(255), FLOODFILL_FIXED_RANGE);
      }
    mat = mat==255;                // output image