https://github.com/frotms/image-filter

some filters (boxfilter, fast bilateral filter, fast guided filter and permutohedral bilateral filter)
https://github.com/frotms/image-filter

bilateral-filter boxfilter code-could-be-run-independently fast-bilateral-filter fast-guided-filter guided-filter permutohedral-bilateral-filter permutohedral-lattice-algorithm propagated-filter

Last synced: about 2 months ago
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some filters (boxfilter, fast bilateral filter, fast guided filter and permutohedral bilateral filter)

• Host: GitHub
• URL: https://github.com/frotms/image-filter
• Owner: frotms
• Created: 2017-03-18T08:51:51.000Z (about 8 years ago)
• Default Branch: master
• Last Pushed: 2021-03-16T17:11:02.000Z (about 4 years ago)
• Last Synced: 2025-03-29T13:22:21.853Z (2 months ago)
• Topics: bilateral-filter, boxfilter, code-could-be-run-independently, fast-bilateral-filter, fast-guided-filter, guided-filter, permutohedral-bilateral-filter, permutohedral-lattice-algorithm, propagated-filter
• Language: C++
• Homepage:
• Size: 53.7 KB
• Stars: 56
• Watchers: 1
• Forks: 22
• Open Issues: 0
• Metadata Files:
  • Readme: README.md

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README

        
# 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; 00, 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](https://opencv.org/)

- [Guided Image Filter](http://kaiminghe.com/eccv10/)

- [Propagated Image Filtering](http://mml.citi.sinica.edu.tw/papers/CVPR_2015_Chang.pdf)

- [Propagated Image Filtering code](http://mml.citi.sinica.edu.tw/papers/PFilter_direct_color_MEX.zip)

- [Fast High-Dimensional Filtering Using the Permutohedral Lattice](http://graphics.stanford.edu/papers/permutohedral/)