我有这张图片:
编辑
抱歉,但是我必须删除图像!
我需要提取非黑色图片的轮廓,因此我将findcontour与CV_RETR_EXTERNAL参数一起使用,但是我得到了以下信息:
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?
最佳答案
只需添加最小阈值的二值化,然后删除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);
关于c++ - OpenCV的findcontours CV_RETR_EXTERNAL不起作用,我们在Stack Overflow上找到一个类似的问题:https://stackoverflow.com/questions/29395771/