- setTo (mat, mask)
- noArray() = Mat()
이미지의 기하학적 변형 - gramman 0.1 documentation
https://opencv-python.readthedocs.io/en/latest/doc/10.imageTransformation/imageTransformation.html
Color
- normalize
- normalize norm
Brightness
- template inline uchar saturate_cast<uchar> (int v)
Histogram
Graph of same Pixel data count
- streching
just stretch 1 dimension
- equalization
take interval as how much thy are