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A bit late... I don't know which error you get (please paste the error) but if the error was like as in:

assertion ... depth == CV_32F || depth == CV_64F in function pow


You need to make sure that the image was in CV_32F or CV_64F format. To do it you can do img8bits.convertTo(imgc, CV_32FC3) for example (for 3-channel).

A bit late... I don't know which error you get (please paste the error) but if the error was is like as in:

assertion ... depth == CV_32F || depth == CV_64F in function pow


You need to make sure that the image was is in CV_32F or CV_64F format. To do it you can do img8bits.convertTo(imgc, CV_32FC3) for example (for 3-channel).