Improvements of winner_takes_all.cu

[KeoChi]

Hello！ Recently, I have been studying Semi-Global Matching of NVIDIA VisionWorks https://developer.nvidia.com/embedded/visionworks . And I compared the running time of this code with your code. I found that the runnning time of the step winner_takes_all.cu is twice the runtime of corresponding step nvxComputeDisparityNode() in Semi-Global Matching code. I'm thinking about how to improve the ‘winner_takes_all.cu’ code. Do you have some improvement plans or suggestions? Thank you.