Some image processing method with SSE/AVX optimization.
int FastBlur(unsigned char *img, unsigned char *dst, int width, int height, int roi_x, int roi_y, int roi_w, int roi_h, int radius);
int DownSampling2X(unsigned char *src, unsigned char *dst, int width, int height);
int DownSampling4X(unsigned char *src, unsigned char *dst, int width, int height);
int DownSampling8X(unsigned char *src, unsigned char *dst, int width, int height);
void SplitUV(unsigned char *src, unsigned char *dst, int size);
void MergeUV(unsigned char *src, unsigned char *dst, int size);
void Average(unsigned char *src1, unsigned char *src2, unsigned char *dst, int size);
Test environment: Intel Core i3-6100 @ 3.70GHz
The input image has the resolution of 1920*1090 and only 1 channel. The function is executed in single thread.
| Function | Time |
|---|---|
| FastBlur | 995 us |
| DownSampling2X | 241 us |
| DownSampling4X | 102 us |
| DownSampling8X | 92 us |
| SplitUV | 50 us |
| MergeUV | 40 us |
| Average | 235 us |
Part of the algorithm and code refer to Imageshop (https://www.cnblogs.com/Imageshop/) , and use AVX/AVX2 instruction set to optimize the code.