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Filtering method and filetring device for digital images

A digital image, image technology, applied in the field of visible artifacts

Inactive Publication Date: 2009-12-09
高智资产72有限责任公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0024] It has been found that prior art methods also have a tendency to delete lines belonging to the actual content of the image
On the other hand, state-of-the-art methods do not always remove all block artifacts or block-related artifacts

Method used

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  • Filtering method and filetring device for digital images
  • Filtering method and filetring device for digital images
  • Filtering method and filetring device for digital images

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Experimental program
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Embodiment Construction

[0056] The following main reference Figures 2 to 6 The present invention and its preferred embodiments are described.

[0057] The operation of the digital image decoder will be described below. In the digital image transmission system based on the present invention, for example Figure 5 As shown in , the order of block and block boundary scan used in encoder and decoder is the same, i.e. known to both encoder and decoder. However, no specific scan order selection is necessary for implementing the method according to the invention. figure 2 Shown is the favorable scanning order of a frame containing groups of blocks (eg macroblocks). First, the upper left block B1 is decoded, ie the pixel values ​​representing (for example) the brightness information of the block are reconstructed and stored in the frame buffer. Then the upper right block B2 is decoded and stored in the frame buffer. Now, there is one decoding block on each side of the first vertical boundary R12 betwe...

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Abstract

The invention relates to a method for reducing visual artefacts in a digital image, which is coded by blocks (B 1 , B 2 , B 3 , B 4 ) and then decoded. In the method filtering is performed to reduce visual artefacts due to a boundary (R 12 , R 13 , R 24 , R 34 ) between a current block and an adjacent block (B 1 , B 2 , B 3 , B 4 ). The filtering is performed after the current block (B 1 , B 2 , B 3 , B 4 ) is decoded and there is a boundary available for filtering between the current block and a previously decoded block.

Description

technical field [0001] The present invention relates to a method of reducing visible artifacts in block encoded and decoded digital images. Filtering is implemented in the method to attenuate visible artifacts originating from boundaries between the current block and neighboring blocks. The invention also relates to a device for reducing visible artifacts in a digital image coded in blocks and decoded, comprising means for performing filtering to reduce visible artifacts originating from boundaries between a current block and adjacent blocks. The invention also relates to an encoder comprising an encoding device and a device for in-situ decoding of digital images block by block. The encoder includes means for performing filtering to reduce visible artifacts originating from boundaries between the current block and neighboring blocks. The invention also relates to a decoder comprising a device for decoding digital images block by block. The decoder includes means for perform...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H04N7/30H04J3/00H04N1/409H04N1/41H04N19/80H04N19/86H04N19/89H04N19/895
CPCH04N19/00939H04N19/00593H04N19/00909H04N19/527H04N19/86H04N19/895H04N19/80
Inventor J·莱尼马B·-P·多布林M·卡策维茨
Owner 高智资产72有限责任公司