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I am pretty sure that your problem is the C-api... apart that you are displaying a white image instead of crop; so:

Switch to C++:

void main(){ std::string imagine = "C:\Users\Silvia\Desktop\procesare imagini\images2\T4.png"; cv::Mat img = cv::imread(imagine); cv::Scalar currPixel; cv::Mat imgLUM = cv::imreadimagine); for (int y = imgLUM.rows/1.3; y > 0; y--) { for (int x = imgLUM.cols/1.3; x < imgLUM.cols; x++) { // ??? } } cv::imshow("Image", img); cv::imshow("Image2", imgLUM); cv::waitKey(0); }
Then do a crop:

cv::Mat image = cv::imread(imagine); cv::Rect cropArea(image.cols/3, image.rows/3, image.cols/3, image.rows/3); // play with values to obtain what you need, now it is the meddle of the image cv::Mat croppedImage = image(cropArea); cv::imshow("image", image); cv::imshow("cropped image", croppedImage); cv::waitKey();
If you want to remove the cropped area of the image, then just do

image(cropArea).setTo(cv::Scalar(0, 0, 0, 0));

I am pretty sure that your problem is the C-api... apart that you are displaying a white image instead of crop; so:

1: Switch to C++:

void main(){ std::string imagine = "C:\Users\Silvia\Desktop\procesare imagini\images2\T4.png"; cv::Mat img = cv::imread(imagine); cv::Scalar currPixel; cv::Mat imgLUM = cv::imreadimagine); for (int y = imgLUM.rows/1.3; y > 0; y--) { for (int x = imgLUM.cols/1.3; x < imgLUM.cols; x++) { // ??? } } cv::imshow("Image", img); cv::imshow("Image2", imgLUM); cv::waitKey(0); }

}
2: Then do a crop:

cv::Mat image = cv::imread(imagine); cv::Rect cropArea(image.cols/3, image.rows/3, image.cols/3, image.rows/3); // play with values to obtain what you need, now it is the meddle middle of the image cv::Mat croppedImage = image(cropArea); cv::imshow("image", image); cv::imshow("cropped image", croppedImage); cv::waitKey();

cv::waitKey();
3: If you want to remove the cropped area of the image, then just do

~~image(cropArea).setTo(cv::Scalar(0, 0, 0, 0));~~

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