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cv::sum() and cv::norm() for CV_U8...

result of cv::sum() is double - could you please tell how calculation is performed for CV_8U Matrix? Same question for cv::norm() please

Will it convert to double every element or only result?

Also could you please tell how to locate implementation in source code as direct search shows only *.hpp?

cv::sum() and cv::norm() for CV_U8...

result of cv::sum() is double - could you please tell how calculation is performed for CV_8U Matrix? Same question for cv::norm() please

Will it convert to double every element or only result? result only?

Also could you please tell how to locate implementation in source code as direct search shows only *.hpp?