The rgb2nv12/bgr2nv12/rgb2nv21/bgr2nv21 converts a
3-channel RGB/BGR image to NV12/NV21 (4:2:0) format. The function
outputs Y plane and interleaved UV/VU plane separately. NV12/NV21 holds
the subsampled data, Y is sampled for every RGB/BGR pixel and U, V are
sampled once for 2 rows and 2 columns (2x2) pixels. UV/VU plane is of
(rows/2)*(columns/2) size as U and V values are interleaved.
API Syntax