Self-adaptive post-filtering for reducing noise in highly compressed image/video coding

An image medium and low-pass filter technology, applied in highly compressed image/video coding, in the field of improved algorithms for reducing ringing noise in image/video coding, and can solve problems such as artificial signals and ringing noise
CN1450811AInactive Publication Date: 2003-10-22GK BRIDGE 1
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Patent Information

Authority / Receiving Office
CN Ā· China
Patent Type
Applications(China)
Current Assignee / Owner
GK BRIDGE 1
Publication Date
2003-10-22
Estimated Expiration
Not applicable Ā· inactive patent

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Abstract

A technique to reduce ringing artifacts in highly compressed block-based image / video coding is applied to each reconstructed frame output from the decoder. For each pixel block of a reconstructed frame, low-pass filtering is then adaptively applied according certain calculated differences between adjacent pixel values. For each pixel, a determination is made as to what type of horizontal filter, if any, is to be applied. Depending on the results of that determination, the pixel may remain unfiltered or may have a 2- or 3-tap horizontal filter applied to it. A similar process is undertaken to determine what type of vertical filter, if any, is to be applied, no filter, a 2-tap or a 3-tap vertical filter.
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Description

[0001] Continue to apply for information

[0002] This application claims the benefit of 35 U.S.C. Ā§ 119(e) of US Provisional Application Serial No. 60 / 370643, filed April 5, 2002.

[0003] This application is related to US Application Serial No. 10 / 037767, filed October 23, 2001, and US Application Serial No. 10 / 176994, filed June 21, 2002, the contents of which are incorporated herein by reference. technical field

[0004] The present invention relates to image data filtering, and more particularly to an improved algorithm for reducing ringing noise in image / video coding. The present invention can be implemented as a device, a method or an instruction program, and is especially suitable for highly compressed image / video coding. Background technique

[0005] Most current video coding standards, such as MPEG-4 of the International Organization for Standardization (ISO) and H.263 of the International Telecommunication Union (ITU), employ block-based motion compensation and p...

Claims

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