Kharoud's profile - activity

As only mean of rectangular region in image is required, so rectangular region should be cropped before applying meanStdDev.

Firstly store rectangular region in another matrix and then you can use meanStdDev to calculate mean value of matrix.

Try OpenCV findcontours function to find contour of each line and then using contour properties you can easily find all point coordinates in each line (contour).

Example if you firstly find contours of all lines using following function:

findContours(input_image, contours_all, hierarchy, CV_RETR_TREE, CV_CHAIN_APPROX_SIMPLE, cv::Point(0, 0));

Then use following code to store all points of ith line in image:

std::vector<cv::point> points = contours_all[i];