rayxie29 / yuvconverter Goto Github PK

YUV format is a color encoded system, it can be transformed by RGB format.
The concept of YUV format is to separate the color information and luminance information. The Y channel is for luminance value and U&V channels are for color value. YUV format usually has smaller bandwidth than RGB format, because it reduced the chrominance information. But it can still perform good quality after decoding.

RGB to YUV conversion formula:

Y = 0.299R + 0.587G + 0.114B
U = -0.169R -0.331G +0.5B +128
V = 0.5R - 0.419G - 0.081*B + 128

There are two major types of YUV format
1.planer: each Y, U and V put separately in the momory
ex:
YYYYY
YYYYY
UUUUU
VVVVV
2.semi-planer:Y and UV put separately in memory, the difference between planer and semi-planer is that UV format put together in semi-planer.
ex:
YYYYY
YYYYY
UVUVU
VUVUV

This repo include:

RGB -> YUV444 planer
RGB -> YUV444 semi-planer
RGB -> YUV422 planer R
RGB -> YUV422 planer YV16
RGB -> YUV420 planer I420
RGB -> YUV420 planer NV12
RGB -> YUV420 semi-planer

Also from above YUV format to RGB fomat