OPENCV：计算图像左边缘的像素

Question

i want to know how to make a loop to count image pixel start counting pixels from the left edge of the image

how to make this using c++ opencv

Answer 1

you don't need to build the loop yourself, it is all already done for you.

cv::Mat img = cv::imread("img.jpg");
std::cout << img.total() << std::endl;

The first line loads your image into the standard C++ OpenCV container Mat . The second line prints the number of elements in the underlaying array of the Mat , in case of an image, this is equal to the total number of pixels of that image.

If those constructs were new to you, you should start with reading these tutorials.