some mainstream image filter: boxfilter, fast guided filter, fast bilateral filter, permutohedral bilateral filter and propagated filter

• boxfilter
• fast guided filter
• fast bilateral filter
• permutohedral bilateral filter
• propagated filter

All original dependencies have been removed. Code could be run independently.

BOXFILTER

@param src                         image,single channel.
@param dst                      output image,single channel.
@param w                           width of image.
@param h                           height of image.
@param c                          channel of image, only c = 1.
@param r                          local window radius.
@return                            0:ok; 1:error
int BoxfilterFilter(unsigned char *src, unsigned char *dst, int w, int h, int c, int r);

Fast Guided Filter

@param src                         image,single channel.
@param guidance                   guided image,single channel.
@param dst                      output image,single channel.
@param w                           width of image.
@param h                           height of image.
@param c                          channel of image, only c = 1.
@param r                          local window radius.
@param rp                          regularization parameter:eps.
@param sr                          subsampling ratio, sr>1:downscale; 0<sr<1:upscale.
@return                            0:ok; 1:error
int FastGuidedFilter(unsigned char *src, unsigned char *guidance, unsigned char *dst, int w, int h, int c, int r, float rp, float sr);

FastBilateralFilter

@param src                         input image.
@param guidance                   guided image,single channel, only single channel is valid; invalid parameter in three channels.
@param dst                      output image.
@param w                           width of image.
@param h                           height of image.
@param c                          channel of image, only c = 1 or c = 3.
@param sigma_s                  filter sigma in the coordinate space. A larger value of the parameter means that farther pixels will influence each other as long as their colors are close enough (see sigmaColor ). When d>0, it specifies the neighborhood size regardless of sigmaSpace. Otherwise, d is proportional to sigmaSpace.
@param sigma_r                  filter sigma in the color space. A larger value of the parameter means that farther colors within the pixel neighborhood (see sigmaSpace) will be mixed together, resulting in larger areas of semi-equal color.
@return                            0:ok; 1:error
int FastBilateralFilter(unsigned char *src, unsigned char *guidance, unsigned char *dst, int w, int h, int c, float sigma_s, float sigma_r);

PermutohedralBilateralFilter

@param src                         input image.
@param guidance                   guided image. 
@param dst                      output image.
@param w                           width of image.
@param h                           height of image.
@param c                          channel of image, only c = 1 or c = 3.
@param sigma_s                  filter sigma in the coordinate space. A larger value of the parameter means that farther pixels will influence each other as long as their colors are close enough (see sigmaColor ). When d>0, it specifies the neighborhood size regardless of sigmaSpace. Otherwise, d is proportional to sigmaSpace.
@param sigma_r                  filter sigma in the color space. A larger value of the parameter means that farther colors within the pixel neighborhood (see sigmaSpace) will be mixed together, resulting in larger areas of semi-equal color.
@return                            0:ok; 1:error
int PermutohedralBilateralFilter(unsigned char *src, unsigned char *guidance, unsigned char *dst, int w, int h, int c, float sigma_s, float sigma_r);

PropagatedFilter

@param src                         input image.
@param guidance                   guided image. 
@param dst                      output image.
@param w                           width of image.
@param h                           height of image.
@param c                          channel of image, only c = 1 or c = 3.
@param r                          local window radius.
@param sigma_s                  filter sigma in the coordinate space. A larger value of the parameter means that farther pixels will influence each other as long as their colors are close enough (see sigmaColor ). When d>0, it specifies the neighborhood size regardless of sigmaSpace. Otherwise, d is proportional to sigmaSpace.
@param sigma_r                  filter sigma in the color space. A larger value of the parameter means that farther colors within the pixel neighborhood (see sigmaSpace) will be mixed together, resulting in larger areas of semi-equal color.
@return                            0:ok; 1:error
int PropagatedFilter(unsigned char *src, unsigned char *guidance, unsigned char *dst, int w, int h, int c, int r, float sigma_s, float sigma_r);

Reference

• OpenCV
• Guided Image Filter
• Propagated Image Filtering
• Propagated Image Filtering code
• Fast High-Dimensional Filtering Using the Permutohedral Lattice