Incorrect calls to cv::Sobel() in PuRe? about eyerectoo

[tcsantini]

You are most definitely right: The delta parameter is missing, and as a result, the value 1 (the BORDER_REPLICATE macro) is being used for it and BORDER_DEFAULT for borderType.
Great spotting, thanks!

The consequence is a constant value being added to all the pixels, which doesn't really have any meaningful effect for our case. The fix is just adding delta as zero, i.e.:
Sobel(blurred, dx, dx.type(), 1, 0, 7, 1, 0, BORDER_REPLICATE);
Sobel(blurred, dy, dy.type(), 0, 1, 7, 1, 0, BORDER_REPLICATE);

C++ is not to blame though; blame me for my inattentiveness and OpenCV for not using a proper scoped enumeration for the parameter :-)