CUDA Convolution
https://www.evl.uic.edu/sjames/cs525/final.html
Improve Image Processing Using GPU Computing on Mali™
https://www.arm.com/files/event/2014_ARM_Multimedia_Seminar_Arcsoft.pdf
GPU Computing: Image Convolution
http://cg.ivd.kit.edu/downloads/assignment3_GPUC.pdf
CUDA Pro Tip: Increase Performance with Vectorized Memory Access
https://devblogs.nvidia.com/cuda-pro-tip-increase-performance-with-vectorized-memory-access/