Opencv findcontours CV_RETR_EXTERNAL not working
Opencv findcontours CV_RETR_EXTERNAL not working
我有这个图像:
编辑抱歉,我不得不删除这些图片!
我需要提取非黑色图片的轮廓,所以我使用了带有CV_RETR_EXTERNAL参数的findcontour,但我得到了这个:
这是代码:
static Mat canny_output, grey,draw;
vector<vector<Point>> contours;
cvtColor(final_img, grey, CV_BGR2GRAY);
Canny(grey, canny_output, 100, 200);
findContours(canny_output, contours, CV_RETR_EXTERNAL, CV_CHAIN_APPROX_SIMPLE);
draw = Mat::zeros(canny_output.size(), CV_8UC3);
for (size_t i = 0; i < contours.size(); i++)
{
drawContours(draw, contours, i, Scalar(255, 0, 0));
}
我该如何解决?
只需添加一个具有最小阈值的二值化,并删除Canny:
cvtColor(final_img, grey, CV_BGR2GRAY);
//Threshold=1: very low value, anyway the rest of the image is pure black
threshold(grey, binary, 1, 255, CV_THRESH_BINARY);
findContours(binary, contours, CV_RETR_EXTERNAL, CV_CHAIN_APPROX_SIMPLE);
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