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Block distortion reduction method and device and method and device for coding data

A data block and block distortion technology, which is applied in the field of coded data, can solve the problem of prominent data block noise

Inactive Publication Date: 2004-01-28
SONY CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Therefore, when re-encoding or encoding for format is performed by using an encoding method in which the position of the boundary between blocks is the same so that block noise in an image is not eliminated, data Block noise is particularly prominent in reproduced images

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  • Block distortion reduction method and device and method and device for coding data
  • Block distortion reduction method and device and method and device for coding data
  • Block distortion reduction method and device and method and device for coding data

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Embodiment Construction

[0047] Embodiments of the present invention will now be described with reference to the accompanying drawings.

[0048] FIG. 1 shows a schematic structure of a data block distortion reducing device 1 according to the first embodiment. The block distortion reducing apparatus 1 shown in FIG. 1 is an example including an MPEG decoder apparatus for decoding an MPEG bit stream. That is, the block distortion reducing means 1 reduces block distortion which occurs when image data is subjected to decoding processing in an MPEG decoder.

[0049] The data block distortion reduction device 1 comprises: an MPEG decoder 2 for decoding processing of provided image data; a coding difficulty evaluation circuit 3 for evaluating the coding difficulty of the image data for decoding processing; A parameter calculation circuit 4 for calculating the parameters required for determining the distortion of the data block; a vertical correlation detection circuit 5 for detecting the correlation of the i...

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Abstract

An apparatus incorporates encoding-degree-of difficulty detecting means 3 for detecting a parameter indicating an encoding degree of difficulty from supplied image data; parameter calculating means 4 for calculating a parameter required to determine block distortion from supplied image data; block distortion determining means 6 for determining block distortion in accordance with a result of detection of the parameter indicating the encoding degree of difficulty and a result of the calculation for obtaining the parameter; correction-value calculating means 7 for calculating a correction value for reducing block distortion; and means for subjecting supplied image data to a correction using a correction value corresponding to a result of the determination of block distortion so as to produce an output.

Description

technical field [0001] The present invention relates to a method and apparatus for reducing block distortion generated in block encoding of input data such as still image data or moving image data to be subjected to a DCT encoding process and relates to Methods and apparatus for encoding data while reducing data block distortion. Background technique [0002] Hitherto, a block encoding method, such as a block DCT (Discrete Cosine Transform) method, has been known as an encoding method for efficiently compressing and encoding like still image data, moving image data, and the like. [0003] When image data or the like is compressed / decompressed by a block encoding method, block distortion (block noise) sometimes occurs. Proportional to the compression ratio, distortion is easy to produce. Since the DCT coding process is arranged for transformation in a block in a closed space, the correlation across the block boundary is not considered, and the continuity across the block bo...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H04N5/21G06T9/00H04N19/00
CPCH04N19/00781H04N19/00151H04N19/00278H04N19/00157H04N19/00472H04N7/26244H04N7/26127H04N7/26941H04N7/50H04N7/26888H04N19/0089H04N7/26138H04N7/26377H04N7/362H04N19/00733H04N19/00909H04N19/139H04N19/176H04N19/51H04N19/61H04N19/14H04N19/80H04N19/86H04N19/40H04N5/21
Inventor 福田京子小林博伊木信弥小幡功史加藤元树
Owner SONY CORP