Optimize OpenCL LUT function
Use 4 pixels for one unit. Some ocl code refactoring
Optimize OpenCL LUT function
Optimize OpenCL LUT function
Fix some errors
Fix some errors
Fix kernel by comments
Read 4 pixel for aligned data with 1 channel
If lut table has one channel and src aligned to 4, work with src as with one channel matrix
Merge pull request #2755 from vbystricky:oclopt_LUT