Video comfort noise addition technique

A technique for noisy, video streaming, applied in the area of ​​decoding related artifacts

Inactive Publication Date: 2006-11-01
INTERDIGITAL VC HLDG INC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Adding random noise to the decoded stream can make these compression artifacts less noticeable, but the large frame-to-frame variance caused by adding random noise can itself produce easily noticeable and unpleasant artifacts

Method used

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Embodiment Construction

[0011] In accordance with the principles of the present invention, subjective video quality can be improved by adding random noise, including a dither signal, to an already decoded signal in an amount related to the brightness of at least a portion of the current picture.

[0012] Adding noise to the decoded signal has hitherto been found to improve the quality of the video signal. The visual impact of adding a noise signal to a video sequence rather than just a single image becomes a consideration when determining the magnitude of the noise signal. The visual impact of adding a noise signal to a video sequence rather than just a single image is considered when determining the noise signal magnitude. The magnitude of the additive noise signal of a pixel in a picture may be related to the value of the additive noise signal of a pixel in a previously displayed picture, eg the noise signal is time correlated. Alternatively, the temporal correlation may be based on previously dec...

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Abstract

A decoding arrangement (10, 100, 1000) for decoding pictures in an incoming video stream includes a noise generator (16 ) for adding a dither signal containing random noise to the pictures after video decoding, to improve the subjective video quality. The noise generator adds noise to each pixel in an amount correlated to the luminance of at least a portion of the current picture.

Description

[0001] Cross References to Related Applications [0002] This application claims priority to US Provisional Patent Application Serial No. 60 / 505,254, filed September 23, 2003, the teachings of which are incorporated herein. technical field [0003] The present invention relates to a technique for reducing artifacts associated with the decoding of encoded video streams. Background technique [0004] Decoding of video streams compressed at low bit rates often produces visible artifacts that can be perceived by the viewer. Blockiness and structured noise patterns are common artifacts that appear when using block-based compression techniques. The human visual system is more sensitive to certain types of artifacts, and as such, these artifacts are more perceptible and objectionable than others. Adding random noise to the decoded stream can make these compression artifacts less noticeable, but the large frame-to-frame variance caused by adding random noise can itself produce eas...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04N7/26
CPCH04N5/21H04N19/85H04N19/86G06T5/001G06T2207/20204H04N21/426Y02E60/32
Inventor 亚历山德罗斯·M·图雷皮斯吉尔·M·博伊斯琼·拉克
Owner INTERDIGITAL VC HLDG INC
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