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Hi! As I see, you declare a 2 dimensional Mat, so you can use Mat.at<>() like this:

downSize.at<float>(row, column)

Hi! As I see, you declare a 2 dimensional Mat, your source has type CV_U8C1, so you can should use Mat.at<>() like this:

downSize.at<float>(row, Mat.at<unsigned char>(row, column)

.

Hi! As I see, your source has type CV_U8C1, so you should use Mat.at<unsigned char>(row, column). Destination type isn't taken into account, as described here: resize.

Hi! As I see, your source has type CV_U8C1, so you should use Mat.at<unsigned downSize.at<unsigned char>(row, column). Destination type isn't taken into account, as described here: resize.