How to print out a pixel value in a Mat image

问题

I have a question about how to cout a pixel value in an image.

For example: I have image and size is 10*10, I want to cout the pixel value at row 5 and column 5 in the image, here is what I code.

Mat img;
cout << img.at<uchar>(5,5) << endl;

But the result is in the following image

I'm wondering why it prints such strange symbol?

Can anyone help me? Thanks a lot!!!!

回答1:

You are printing char value. So the value will translate into ANSI representation of that value. If you want to see a number, cast the result:

static_cast<int>(img.at<uchar>(5,5))

来源：https://stackoverflow.com/questions/36281362/how-to-print-out-a-pixel-value-in-a-mat-image