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Description
Describe the feature and motivation
Thank you for your work, but I tested and found that the speed of this function in version 4.11 is slower than in version 4.7.
Here are the test images and test results.
#include<opencv2/opencv.hpp>usingnamespacestd;usingnamespacecv;intmain(){Mat img =imread("111.bmp", cv::IMREAD_GRAYSCALE);cv::Mat mask;inRange(img,110,120, mask);std::vector<std::vector<cv::Point>> v_cont;for (int i =0; i <10; i++){v_cont.clear();auto start =chrono::system_clock::now();cv::findContours(mask, v_cont, cv::RETR_EXTERNAL, cv::CHAIN_APPROX_SIMPLE);auto end =chrono::system_clock::now();auto duration = chrono::duration_cast<chrono::microseconds>(end - start) /1000.;cout <<"4.11 findContours cost" <<double(duration.count()) <<"ms" << endl;}}
Additional context
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