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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

Inactive Publication Date: 2003-10-22
GK BRIDGE 1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Block-based coding can cause blocking artifacts and ringing noise when images are highly compressed

Method used

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

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Embodiment Construction

[0020] The present invention provides a technique (eg, an algorithm) to reduce ringing noise in highly compressed image / video coding. This technique uses adaptive filtering to reduce ringing noise in image / video data. For each reconstructed frame block (ie, pixel block), the algorithm adaptively filters selected block regions based on some computed differences to reduce ringing artifacts. Such as figure 1 This technique is applied to each reconstructed frame output from decoder 10 as shown. The reconstructed frames from the decoder 10 are stored in a frame buffer 11 . A post-processor 12 accesses the frames from the frame buffer 11 and processes them according to the invention as detailed below.

[0021] Such as figure 2 The flow diagram shown illustrates an algorithm according to an embodiment of the invention. The algorithm starts by obtaining a digital input representation of a reconstructed frame block from the decoder (step 21). From this block, unprocessed pixels ...

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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.

Description

[0001] Continue to apply for information [0002] This application claims the benefit of 35 U.S.C. § 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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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G06T5/00H04N1/41H04N7/26H04N7/30H04N7/50
CPCH04N19/00781H04N19/00303H04N19/00157H04N7/50G06T5/001H04N19/00066G06T5/002H04N7/26058H04N7/26127H04N7/26888H04N19/0089H04N7/26377G06T5/20G06T2207/20021H04N19/00909H04N7/26255H04N19/117H04N19/14H04N19/182H04N19/61H04N19/80H04N19/86
Inventor C·金
Owner GK BRIDGE 1
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