問題描述
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I have an edge map extracted from edge detection module in OpenCV (canny edge detection). What I want to do is to fill the holes in the edge map.
I am using C++, and OpenCV libraries. In OpenCV there is a cvFloodFill() function, and it will fill the holes with a seed (with one of the location to start flooding). However, I am trying to fill all the interior holes without knowing the seeds.(similar to imfill() in MATLAB)
Q1: how to find all the seeds, so that I could apply 'cvFloodFill()'?
Q2: how to implement a 'imfill()' equivalent?
Newbie in OpenCV, and any hint is appreciated.
According to the documentation of imfill in MATLAB:
BW2 = imfill(BW,'holes');fills holes in the binary image
BW. A hole is a set of background pixels that cannot be reached by filling in the background from the edge of the image.
Therefore to get the "holes" pixels, make a call to cvFloodFill with the left corner pixel of the image as a seed. You get the holes by complementing the image obtained in the previous step.
MATLAB Example:
BW = im2bw( imread('coins.png') );
subplot(121), imshow(BW)
% used here as if it was cvFloodFill
holes = imfill(BW, [1 1]); % [1 1] is the starting location point
BW(~holes) = 1; % fill holes
subplot(122), imshow(BW)
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