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Reduction of compression artefacts in displayed images, analysis of encoding parameters

A technology for encoding parameters and images, applied in display devices, reducers, encoding parameters for analyzing encoded image data streams, and analyzers for encoding parameters, and can solve problems such as side effects

Inactive Publication Date: 2009-03-11
KONINKLIJKE PHILIPS ELECTRONICS NV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Known artifact suppression methods do not reduce the problem, or have severe side effects

Method used

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  • Reduction of compression artefacts in displayed images, analysis of encoding parameters
  • Reduction of compression artefacts in displayed images, analysis of encoding parameters
  • Reduction of compression artefacts in displayed images, analysis of encoding parameters

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Embodiment Construction

[0061] Aspects of the invention will now be described more fully hereinafter with reference to the accompanying drawings, in which preferred embodiments of the invention are shown. However, the present invention may be embodied in various forms and should not be limited to the examples set forth herein; while these examples are provided to make the description clear, the present invention will fully cover the scope of the present invention to those skilled in the art. Similar symbols denote similar elements throughout.

[0062] Compression techniques are often used to compress data streams, ie to reduce the amount of data in a data stream. In particular, consumer recording devices (DVD recorders, hard disk recorders, etc.) use digital compression algorithms to provide digitally compressed streams, such as MPEG2 streams. This compression technique may be the less lossy one, but generally some data loss is considered acceptable when using an appropriate amount of compression. ...

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PUM

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Abstract

A hither before unknown cause of image artefacts has been identified. Encoders such as MPEG encoders may use two picture structures: Field pictures and frame pictures. For a frame picture both frame and field-based DCT (and other types) of coding may be used. The decision whether to use frame or field based coding is not always made correctly. In the decoded image this leads to an image artefact visible as stripped blocks. The invention reduces, in one aspect of the invention, these artefacts by analyzing the block content on the presence of such artefacts and if the analysis proof the existence of such artefacts applying a vertical low pass filter to the data in the block. In another aspect of the invention encoding parameters are checked for combination of encoding parameters for which the artefact may occur and such blocks are indicated. The invention may be embodied in a method as well as in a device such as a receiver, encoder, decoder, display device etc.

Description

technical field [0001] The invention relates to a method of processing a compressed image data stream in which compression artifacts are reduced. [0002] The invention also relates to a reducer for reducing compression artifacts in a displayed decompressed image. [0003] The invention also relates to a receiver for receiving a compressed image data stream of a displayed image, said receiver comprising a reducer for reducing compression artifacts in the displayed decompressed image. [0004] The invention also relates to a display device comprising a receiver for receiving a compressed image data stream of a displayed image, said receiver comprising a reducer for reducing compression artifacts in the displayed decompressed image. [0005] The invention also relates to a transcoder for transcoding a compressed image data stream, wherein said transcoder comprises a reducer for reducing compression artifacts in a displayed decompressed image. [0006] The invention also relate...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G06T5/00H04N7/26
CPCH04N19/00781G06T5/20H04N19/00533H04N19/00593G06T5/002G06T5/001H04N19/00224H04N19/61H04N19/16H04N19/44H04N19/527G06T5/70H04N19/85
Inventor I·O·基伦科R·J·范德夫卢滕
Owner KONINKLIJKE PHILIPS ELECTRONICS NV