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Method and apparatus for manipulating bit streams

A technology of macroblock and rate conversion, which is applied in the direction of TV, electrical components, pulse modulation TV signal transmission, etc.

Inactive Publication Date: 2010-03-31
THOMSON LICENSING SA
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although the T1 algorithm provides decent video quality for MPEG-2 encoded video bitstreams, the algorithm produces unacceptable quality video for input streams encoded using the H.264 encoding standard

Method used

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  • Method and apparatus for manipulating bit streams

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Embodiment Construction

[0010] According to the present principle, a technique for transrating consecutive macroblocks in a bitstream (in particular, a video bitstream coded according to the H.264 standard) is provided. Before discussing the transrating technique of the present principles, a brief description of the H.264 coding standard will be useful.

[0011] The H.264 coding standard includes advanced video compression standards that use a set of progressive tools to achieve optimal video quality at lower bit rates. Due to the complexity associated with the H.264 video compression standard (mainly due to the spatial dependence between compression of intra macroblocks), T1 transrating algorithms will generally provide poor quality results.

[0012] The H.264 compression standard contains certain features that adversely affect the output video quality after the T1 algorithm is applied. In addition to the quality degradation of the macroblock itself due to higher quantization, features in the H.264...

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Abstract

Trans-rating of successive macroblocks in a video stream occurs in accordance with the block type. For example, an (Inter) Intra-coded macroblock will generally get trans-rated using first algorithm partly decodes the macroblock and modifies coded residual coefficients by raising coefficient quantization. Intra-coded macroblocks generally get trans-rated using a second technique that operates first to decode the macroblock and then derive all the main decisions therefrom to re-encode the stream using the original decisions. Separately trans-rating Inter-coded and Intra-coded macroblocks in this manner reduces computational complexity, as compared to the use of a single trans-rating algorithm, while still maintaining good video quality.

Description

[0001] Cross References to Related Applications [0002] This application claims priority under 35. U.S.C. 119(e) to U.S. Provisional Patent Application No. 60 / 863,645, filed October 31, 2007, the teachings of which are incorporated herein. technical field [0003] The invention relates to a technique for processing the bit rate of a bit stream, especially a video bit stream. Background technique [0004] Trans-rating algorithms, sometimes called Rate-Shaping algorithms, are real-time algorithms constructed to process the bit rate of a compressed digital video stream to a desired result. Transrating (rate shaping) algorithms are used in the broadcast television industry. For example, when using a statistical video multiplexer to combine multiple independent video bitstreams and output all of them on a fixed bandwidth channel, transrate the bitrates of the independent streams such that the bitrates of the independent streams are between and a constant bandwidth rate that do...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04N7/26
CPCH04N19/00545H04N7/26079H04N19/00781H04N19/00278H04N7/26053H04N19/00218H04N7/26313H04N7/26244H04N7/26212H04N19/0006H04N19/00472H04N7/26941H04N7/50H04N19/0009H04N19/115H04N19/124H04N19/159H04N19/176H04N19/40H04N19/46H04N19/61
Inventor 阿米特·波拉特
Owner THOMSON LICENSING SA