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Adaptive variable-length coding and decoding methods for image data

a technology of image data and variable length, applied in the field of adaptive variable length coding and decoding methods for digital image data, can solve problems such as large data quantity, and achieve the effect of improving the compression efficiency of data

Inactive Publication Date: 2006-07-11
SAMSUNG ELECTRONICS CO LTD
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  • Abstract
  • Description
  • Claims
  • Application Information

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Benefits of technology

[0028]Therefore, it is an object of the present invention to provide an adaptive variable-length coding method which improves compression efficiency of data by selecting an optimal variable-length coding table among a plurality of variable-length coding tables according to the current scanning position and quantization step size while scanning in a zigzag pattern by block type, i.e., inter / intra mode.

Problems solved by technology

However, in the case of coding a video signal into digital data, the data quantity is large.

Method used

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Embodiment Construction

[0048]Hereinbelow, a preferred embodiment of the present invention will be described with reference to the accompanying drawings.

[0049]In the adaptive variable-length coding method according to the present invention, a plurality of variable-length coding tables are used. The table is selected in accordance with a block type, quantization step size and a current scanning position while scanning a block in a zigzag pattern. This selection is in accordance with the statistical characteristics of [run, level] data which vary depending on block type, i.e., intra mode / inter mode or luminance signal / color signal, quantization step size and a current zigzag scanning position, and which will be described in more detail.

[0050]The inter mode for coding the differential signal between the current block data and motion compensated block data generates most of the DCT coefficients as “0” but scarcely generates larger values, compared to the intra mode for coding input block image data sequentiall...

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Abstract

An adaptive variable-length coding / decoding method performs an optimal variable-length coding and decoding depending on an intro mode / inter mode condition, quantization step size and a current zigzag scanning position, such that a plurality of variable-length coding tables having different patterns of a regular region and an escape region according to statistical characteristics of the run level data are set. One of the variable-length coding tables is selected according to mode, quantization step size and scanning position, and the orthogonal transform coefficients according to the selected variable-length coding table are variable-length-coded.

Description

[0001]More than one reissue application has been filed for the reissue of U.S. Pat. No. 5,793,897 filed Nov. 3, 1995. The reissue applications are application Ser. Nos. 09 / 638,796 (the present application) filed Aug. 11, 2000, 09 / 654,939 filed Dec. 22, 2000, 11 / 017,697 filed Dec. 22, 2004, and 11 / 017,698 filed Dec. 22, 2004. Application Ser. No. 09 / 638,796 is a reissue of U.S. Pat. No. 5,793,897. Application Ser. No. 09 / 654,939 is a divisional application of 09 / 638,796 and a reissue of U.S. Pat. No. 5,793,897. Application Ser. No. 11 / 017,697 is a divisional application of Ser. No. 09 / 654,939. Application Ser. No. 11 / 017,698 is a divisional application of Ser. No. 09 / 654,939 and a divisional application of Ser. No. 09 / 638,796.TECHNICAL FIELD[0002]The present invention relates to adaptive variablelength coding and decoding methods for digital image data, and more particularly, to adaptive variable-length coding and decoding methods which improve compression efficiency of transmission ...

Claims

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Application Information

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Patent Type & Authority Patents(United States)
IPC IPC(8): G06K9/36G06K9/46H04N5/92G06T9/00G11B20/10H03M7/42H04N19/13H04N19/134H04N19/157H04N19/167H04N19/176H04N19/186H04N19/46H04N19/503H04N19/51H04N19/60H04N19/61H04N19/625H04N19/70H04N19/91H04N19/93
CPCG11B20/10527H03M7/42H04N19/159H04N19/157H04N19/61H04N19/60H04N19/91H04N19/13H03M7/30
Inventor JO, JAE MOONJEONG, JECHANG
Owner SAMSUNG ELECTRONICS CO LTD
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