Itseez/opencv — pull request #3413 by wangyan42164 (2014-11-12 10:52:03+00:00)
Title: Improve the performance of fast_nlmeans_denoising_opencl.

1. Remove unnecessary barriers.
2. Adjust CTA_SIZE based on the following cases:
a) OCL_Photo_DenoisingGrayscale.DenoisingGrayscale
b) OCL_Photo_DenoisingColored.DenoisingColored