Image Processing Algorithms
From Avisynth wiki
Contents |
Image Dithering
Error Diffusion
Image Formats
- v210 v210 is a Quicktime format for storing 10bit YUV video. It's supported by qtinput and deepcolor tools.
- Apple ProRes White Paper | Mirror
Image Denoising
False Contour
Also known as Color Banding and Posterization. Posterization and false contouring are definitely the same thing. Banding can absolutely be used in the same way, but is also used to describe a very different phenomenon where vertical or horizontal "bands" are seen on screen (sort of delineated by differing amounts of darkness/lightness). But yes, they can be all used to describe the same phenomenon.[1]
- Composite Model-Based DC Dithering for Suppressing Contour Artifacts in Decompressed Video.pdf | mirror
- Multi-Scale Probabilistic Dithering for Suppressing Contour Artifacts in Digital Images.pdf | mirror
Fractal and Wavelet Denoising
Mosquito Noise
NL Means
- Bayesian Non-Local Means Filter, Image Redundancy and Adaptive Dictionaries for Noise Removal | mirror
Salt and Pepper Noise
- A Recursive Gaussian Weighted Filter for Impulse Noise Removal.pdf | mirror | Doom9 Forum discussion
Image Inpainting
- Object Removal by Exemplar-Based Inpainting. A. Criminisi, P. Perez, K. Toyama | Source code from Qiushuang Zhang
- ExInPaint by Fizick - An AviSynth plugin based on the above papers | ExInPaint discussion
- Fast Image Inpainting Based on Coherence Transport - Homepage
- Fast Image Inpainting Based on Coherence Transport - High quality version of paper, pdf. Based on a detailed analysis of stationary first order transport equations the current paper develops a fast noniterative method for image inpainting. It traverses the inpainting domain by the fast marching method just once while transporting, along the way, image values in a coherence direction robustly estimated by means of the structure tensor. Depending on a measure of coherence strength the method switches continuously between diffusion and directional transport. It satisfies a comparison principle.
- Discussion of AVSInPaint - AVSInPaint is based on the above papers.
- Digital inpainting: a tutorial - This tutorial will cover the most recent contributions in image inpainting / image completion, video inpainting, and 3-D surface completion. (from 2007)
Image Scaling
- Subpixel Image Scaling for Color Matrix Displays, Michiel A. Klompenhouwer, Gerard de Haan - Subpixel rendering’ algorithms are being used to convert an input image to subpixel-corrected display images. This paper deals with the consequences of the subpixel structure, and the theoretical background of the resolution gain. We will show that this theory allows a low-cost implementation in an image scaler. This leads to high ?exibility, allowing di?erent subpixel arrangements and a simple control over the trade-o? between perceived resolution and color errors.
Edge Directed Interpolation
Spline Scaling
- Doom9 Discussion:
Image Deblurring
Standardized Video Test Patterns
The colorbars values are listed below:
Rec. ITU-R BT.801-1 Description of encoded colour-bar signals according to the 4:2:2 level of Recommendation ITU-R BT.601 100/0/75/0 colour bars color Y Cb Cr white 235 128 128 yellow 162 44 142 cyan 131 156 44 green 112 72 58 magenta 84 184 198 red 65 100 212 blue 35 212 114 black 16 128 128
Description of encoded colour-bar signals according to the 4:2:2 level of Recommendation ITU-R BT.601 100/0/100/0 colour bars AND Rec. ITU-R BT.1729 Appendix 2 100% colorbars color Y Cb Cr white 235 128 128 yellow 210 16 146 cyan 170 166 16 green 145 54 34 magenta 106 202 222 red 81 90 240 blue 41 240 110 black 16 128 128
Discussion of standards references
SuperResolution
- http://auricle.dyndns.org/ALE/
- http://www.soe.ucsc.edu/~milanfar/software/superresolution.html
- http://www.ece.lsu.edu/ipl/Demos.html
- http://ericpbennett.com/VideoEnhancement/BennettMcMillanSIGGRAPH.pdf
- http://www.imse.cnm.es/Xfuzzy/xfpapers.html
- http://www.imse.cnm.es/online/2005/ANNIE2005.JGR.pdf
- http://www.escet.urjc.es/~asanz/investigacion_en.html
- http://www.hindawi.com/GetArticle.aspx?doi=10.1155/2009/381673
- http://www.faculty.idc.ac.il/toky/Publications/Journal/superRes.pdf
- http://www.utia.cas.cz/files/Soutez_08/Aplikace/Sroubek/gui_help_v12.pdf
- further links and discussion on SuperResolution
Image Registration
Deinterlacing
- A Total Variation Motion Adaptive Deinterlacing Scheme | Mirror
- Classification Based Data Mixing for Hybrid De-Interlacing Techniques | Mirror
- High Quality Deinterlacing Using Inpainting and Shutter-Model Directed Temporal Interpolation | Mirror
- Short discussion on deinterlacing
Image Rotation
These are based on the fast 3 shear methods:
First shear : x' = x - tan (theta/2) * y Second shear : y' = y + sin(theta) * x Third shear : x' = x - tan (theta/2) * y
- Convolution-Based Interpolation for Fast, High-Quality Rotation of Images.pdf | Mirror
- Fast and High Quality True-Color Bitmap Rotation Function | Mirror
- Rotation | Mirror
- Rotation by Shearing
- Further discussion and links
Image Sharpening
Warp Sharpening
Seam Carving
- Geometrically Consistent Stereo Seam Carving.pdf | Mirror
- Improved Seam Carving for Video Retargeting | Mirror | PDF | Mirror
- Optimized Image Resizing using Piecewise Seam Carving.pdf | Mirror
- Seam Carving for Content-Aware Image Resizing | Mirror | PDF | Mirror
- Seam Carving with Improved Edge Preservation.pdf | Mirror
- Visibility Maps for Improving Seam Carving.pdf | Mirror
- Short Discussion - AviSynth has a ReTarget plugin for this.
High Dynamic Range (HDR)
TODO
- move to different section and category
- fixed all dead links
