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Bit rate reduction method by requantization

A bit rate, dequantization technology, applied in the direction of image communication, television, electrical components, etc., can solve the problem of large amount of calculation, and achieve the effect of attenuating the degradation of image quality

Inactive Publication Date: 2008-08-20
THOMSON LICENSING SA
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, especially for the bitrate reduction solution, it is very computationally expensive in the presence of a decoder and an encoder

Method used

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  • Bit rate reduction method by requantization

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Embodiment Construction

[0050] In the following, for the sake of precision, terms and acronyms of the AVC standard are mentioned in parentheses, other terms are only approximate. Terms in parentheses are terms defined in this standard (particularly in Part 3).

[0051] The AVC standard provides several coding modes called "skip" mode or "skipped macroblock" mode, for which the macroblock residue is not coded and is considered to be empty:

[0052] - "P_Skip" mode for macroblocks belonging to slices of type P (P slices), or slices of type SP (SP slices).

[0053] - "B_Skip" mode for macroblocks belonging to slices of type B (B slices).

[0054] However, these modes which are economical in terms of encoding costs are only possible under the specific condition that only the decoder at the end of the system is made to reconstruct the macroblock without further information. In standards, for example in the document "Draft of version 4 of H.264 / AVC (ITU-T Recommendation H.264 and ISO / IEC 14496-10 (MPEG-4...

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Abstract

The method is characterized in that: - if the current macroblock was coded according to the "skipped macroblock" mode and if at least one corrected coefficient block of said macroblock has coefficients non-null or greater than a predefined threshold, the coding mode of the macroblock is modified (50) into a mode other than "skipped macroblock" and the data of the data stream is modified or added (50) to specify this mode and the value of the coefficients.

Description

technical field [0001] The invention relates to a method for reducing the bit rate of an encoded video data stream based on encoding using intra and inter modes in reference pictures. Background technique [0002] The invention applies more particularly to video streams of type H.264 or AVC or MPEG-4. This standard is described, for example, in the document ITU-T Rec. H264 / ISO / IEC 14496-10 AVC (MPEG4). [0003] The field is the field of broadcasting television programs over radio, satellite or cable channels (referred to as "broadcasting"), or broadcasting of television programs according to Internet Protocol or IP, over fixed lines or over the air, over ADSL (also referred to as called "broadband"). [0004] A bit-rate reduction method or "transrating" as defined herein involves changing the transmission bit-rate of a data stream encoded according to a standard to another encoded data stream, usually according to the same standard, the bit-rate reduction being performed i...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04N7/26H04N7/30H04N7/50H04N19/50
CPCH04N19/00278H04N19/00127H04N19/008H04N19/00472H04N19/00036H04N19/00139H04N19/109H04N19/132H04N19/136H04N19/176H04N19/40H04N19/619
Inventor 菲利普·博尔德阿尼塔·奥汗德
Owner THOMSON LICENSING SA
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