填充OpenCV中的洞 [英] Fill the holes in OpenCV
问题描述
我有一个从 OpenCV (canny edge detection)中的边缘检测模块提取的边缘图。我想做的是填补边缘地图中的洞。
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.
我使用的是 C ++ 和 OpenCV 库。在OpenCV中有一个 cvFloodFill()函数,它将填充空洞种子(有一个位置开始泛滥)。然而,我试图填充所有的内部洞,而不知道种子(类似于 imfill() in MATLAB)
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:如何找到所有种子,以便我可以应用cvFloodFill
Q2:如何实现一个'imfill()'等价?
Q1: how to find all the seeds, so that I could apply 'cvFloodFill()'?
Q2: how to implement a 'imfill()' equivalent?
OpenCV中的新手, / p>
Newbie in OpenCV, and any hint is appreciated.
推荐答案
根据 imfill
在MATLAB中:
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.
因此要获取hole像素,请调用 cvFloodFill
将图片的左角像素作为种子。
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.
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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