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Apparatus and method for macro block based rate control in coding system

A technology for encoding images and bit rates, applied in image encoding, character and pattern recognition, pulse modulation TV signal transmission, etc., can solve the problem of expensive rate control at the macroblock level, and achieve the best effect of encoding rate

Inactive Publication Date: 2005-10-19
MEDIATEK INC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, rate control at the macroblock level is generally more expensive due to the additional workload if the quantization parameter (quantizer level) varies within the frame

Method used

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  • Apparatus and method for macro block based rate control in coding system
  • Apparatus and method for macro block based rate control in coding system
  • Apparatus and method for macro block based rate control in coding system

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Embodiment Construction

[0022] To facilitate understanding, identical reference numerals have been used, where possible, to denote identical elements that are common to the drawings.

[0023] figure 1 A block diagram showing the apparatus 100 of the present invention for deriving the number of quantizer levels for each macroblock within each frame to maintain the overall quality of the video image while controlling the encoding rate. Although the invention is described below with reference to MPEG-enabled encoders, those skilled in the art will appreciate that the invention can be used with other encoders as permitted by other encoding / decoding standards.

[0024] In a preferred embodiment of the invention, the apparatus 100 is an encoder or part of a more complex block-based motion compensated encoding system. The device 100 includes a motion estimation module 140, a motion compensation module 150, a rate control module 130, a DCT module 160, a quantization (Q) module 170, a variable length coding ...

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Abstract

A method and apparatus for selecting a quantizer scale for each macroblock within a frame to optimize the coding rate is presented. A quantizer scale is selected for each macroblock within each frame such that the target bit rate for the frame is achieved while maintaining a uniform visual quality over the entire frame.

Description

[0001] This application claims the benefit of US Provisional Application No. 60 / 052437, filed July 14, 1997, which is incorporated herein by reference. technical field [0002] The present invention relates to an apparatus and method for optimizing motion picture coding. In particular, the present invention relates to an apparatus and method for properly adjusting the number of quantizer levels for each macroblock within a frame to maintain the overall quality of motion pictures while optimizing the encoding rate. Background technique [0003] The Motion Picture Experts Group (MPEG) established by ISO / IEC International Standards 11172 and 13818 (commonly referred to as MPEG-1 and MPEG-2 formats, respectively) establishes standards for encoding / decoding strategies. While these MPEG standards specify a general encoding method and syntax for generating MPEG-enabled bitstreams, many variations are permitted to accommodate many different applications and are used, for example, in...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G06T9/00H04N7/26H04N7/50
CPCH04N19/00781H04N19/00278H04N7/26164H04N7/26053H04N19/0006H04N7/5046H04N7/26244H04N7/26132H04N19/00145H04N19/00096H04N7/26154H04N7/50H04N19/00193H04N7/26074H04N7/26085H04N19/00266H04N19/00169H04N19/00175H04N19/00381H04N7/26271H04N19/00369H04N19/176H04N19/147H04N19/172H04N19/196H04N19/115H04N19/61H04N19/126H04N19/137H04N19/146H04N19/152H04N19/198G06F18/00
Inventor 蒂浩·张翰久·李亚钦·章
Owner MEDIATEK INC