Patent
Non-linear image filter for filtering noise
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TLDR
In this paper, the authors proposed a recursive noise level estimation method for noise reduction based on fuzzy logic and filter out noise without smoothing the image's fine details using human visual system response to adjust brightness.Abstract:
A system and method for reducing noise using recursive noise level estimation. The system and method for noise reduction substitute a target pixel in a processing window with a weighted average of a plurality of neighboring pixels according to the degree of similarity between the target pixel and the neighboring pixels. The similarity is based on the noise level affecting the image and the local brightness of the processing window. The filter is based on fuzzy logic and filters out noise without smoothing the image's fine details. The filter uses a human visual system (HVS) response to adjust brightness.read more
Citations
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References
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Journal ArticleDOI
Nonlinear space-variant postprocessing of block coded images
B. Ramamurthi,Allen Gersho +1 more
TL;DR: A new nonlinear, space-variant filtering algorithm is proposed which smooths jagged edges without blurring them, and smooths out abrupt intensity changes in monotone areas.
Journal ArticleDOI
Reduction Of Blocking Effects In Image Coding
Howard C. Reeve,Jae Lim +1 more
TL;DR: Two methods are developed to reduce the blocking effect when the image is reconstructed at the decoder due to discontinuities between the subimages in transform coding.
Patent
Device and method for smoothing picture signal, device and method for encoding picture and device and method for decoding picture
Takaaki Hayashi,Minoru Etoh +1 more
TL;DR: In this article, a smoothing filter is used to improve the image quality by adding a certain number to a weight before taking its inverse number, which is controlled by the parameter.
Journal ArticleDOI
Second-generation image coding: an overview
TL;DR: This article gives an overview of a diverse selection of currently used second-generation image coding techniques, grouped into similar categories in order to allow a direct comparison among the varying methods.
Journal ArticleDOI
Post filtering methods for reducing blocking effects from coded images
T. Jarske,P. Haavisto,I. Defe'e +2 more
TL;DR: In this paper, simple post-filtering methods for block-coded image sequences are presented, which offer a feasible method to improve the subjective quality of image sequences coded at low bit rates.