https://blog.csdn.net/goodxin_ie/article/details/82856008

https://stackoverflow.com/questions/49816206/cmake-find-package-specify-path

https://gist.github.com/raulqf/f42c718a658cddc16f9df07ecc627be7

https://linuxize.com/post/how-to-install-opencv-on-ubuntu-20-04/

**OpenCV Error: Assertion failed (src.type() == CV_8UC1) in cv::findNonZero?**

cv::cvtColor(xrayImg,xray1Channel,CV_BGR2GRAY);