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Variable bit rate video encoding method

A technology of video coding and coding method, applied in the field of MPEG-2 encoder

Inactive Publication Date: 2005-01-19
KONINK PHILIPS ELECTRONICS NV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] However, there is another difficulty in maintaining consistent quality when considering the encoding of video sequences: the encoded sequence must fit within a fixed bit budget

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Embodiment Construction

[0011] As mentioned above, one of the challenges of a real-time VBR encoder is that the encoded sequence (of known duration) must fit within a limited bit budget. Best assuming that for a sufficiently long sequence, the proportion of hard and easy pictures to be encoded is substantially the same, the invention now described is based on the fact that the modification of the quantization step of the MPEG-2 encoding process is performed at a regular rate.

[0012] refer to figure 1 The described encoding method and device proposed by the present invention are based on the following two operations. The first step (the analysis step) is used to determine the reserved bits, which are updated every frame and used to indicate whether the number of used bits is too high. The reservation determination step 11 also includes the following sub-steps: sub-step 111, can calculate the total The fixed bit budget TFBB, and sub-step 112, is used to calculate said number of reserved bits ROB(cu...

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Abstract

The DVD standard, with which a very good quality is required all along the recording step, allows for variable bit rate transmission of data, according to which more bits are spent when the pictures are more complex. As the encoded sequence must fit into a fixed bit budget, the invention relates to an encoding method in which, thanks a first analysis step, corrective modifications of the quantization step of the encoding process are carried out at regular intervals during a second control step. These changes are made regarding the state of a reserve of bits, periodically computed and updated, but preferably only when said reserve reaches critical values, and in order to maintain said reserve at a value as close to 0 as possible.

Description

technical field [0001] The present invention relates to a video encoding method with a variable code rate. In order to encode an input code stream corresponding to a frame sequence, the method at least includes a step of quantizing the input code stream, and a step of encoding the quantized code stream. , and the step of controlling the quantization step size according to the buffer occupancy and the corresponding encoding means at the output of said encoding step. The present invention is mainly used in MPEG-2 encoders. Background technique [0002] The MPEG-2 data compression standard is not just for digital video broadcasting, as stated, for example, in BBC Research and Development Report, BBC-RD-1996 / 3, "MPEG Video Coding: An Introduction to Basic Guidance" by S.R.Ely It is also a storage standard for digital video discs (DVD). In a traditional compact disc (CD), the transmission of bits is fixed and the image can be CBR (Constant Bit Rate) encoded. However, two diffe...

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H04N5/92G06T9/00H03M7/40H04N19/115H04N19/126H04N19/15H04N19/152H04N19/172H04N19/60H04N19/61
CPCH04N19/00781H04N7/26164H04N7/5046H04N7/305H04N19/0006H04N19/00266H04N19/00775H04N19/00096H04N19/115H04N19/126H04N19/15H04N19/152H04N19/172H04N19/60H04N19/61H04N19/14
Inventor P·戈蒂尔T·莱德鲁
Owner KONINK PHILIPS ELECTRONICS NV