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You use CV_8UC1 in normalize(). Because of this image_norm should be CV_8UC1 and image_scaled should be CV_8UC1, too. But you use image_scaled.at<float> !

A good practice is do use the Wrapper Mat_<uchar> image_scaled. Because:

You can use a shorter method to access the elements (image_scaled(j,i))
The types can be tested at compile time.

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