Itseez/opencv — pull request #925 by pengx17 (2013-05-29 06:22:18+00:00)
Title: Fix ocl Canny.

This fix is a workaround for current 2.4 branch without introducing an
additional oclMat buffer into CannyBuf object.
Test case is cleaned up.
Volatile keywords in kernels are removed for performance concern.