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Efficient rate control techniques for video encoding

A technology of video coding and rate control, applied in the direction of pulse modulation TV signal transmission, etc., can solve the problem of damage to the transmission frame and so on

Inactive Publication Date: 2006-01-18
QUALCOMM INC
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Problems solved by technology

However, if the QP is too small, the number of bits encoded per second can exceed the allocated bandwidth and impair the ability to transmit frames within the finite amount of bandwidth

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  • Efficient rate control techniques for video encoding
  • Efficient rate control techniques for video encoding
  • Efficient rate control techniques for video encoding

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Embodiment Construction

[0027]This disclosure describes rate control techniques that may be used to improve video encoding. These techniques can be used in any of various video coding standards, such as MPEG-4 standard, ITU H.263 standard, ITU H.264 standard, or other standards. Specifically, these techniques exploit the relationship between the number of bits encoded per frame (the encoding rate) and the number of non-zero coefficients of the quantized frame's video blocks. The number of non-zero coefficients of a video block of a quantized frame is called p. The value of p is generally proportional to the quantization parameter (QP) used in video coding. Therefore, the present disclosure exploits the relationship between p and QP to enable rate-controlled video coding. More specifically, this disclosure provides techniques for generating a look-up table (LUT) that maps values ​​of p to different QPs. The described techniques can simplify video encoders and greatly reduce the number of computatio...

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Abstract

This disclosure describes rate control techniques that can improve video encoding. In particular, the described rate control techniques exploit relationships between the number of bits encoded per frame and the number of non-zero coefficients of the video blocks after quantization. The number of number of non-zero coefficients of the video blocks after quantization is referred to as rho. The value of rho is generally proportional to the number of bits used in the video encoding. This disclosure utilizes a relationship between rho and a quantization parameter (QP) in order to achieve rate controlled video encoding. More specifically, this disclosure provides techniques for generating a lookup table (LUT) that maps values of rho to different QP s.

Description

technical field [0001] This application claims priority to US Provisional Application Patent No. 60 / 586,963, filed July 8,2004. [0002] The present disclosure relates to digital video processing, and more particularly to rate-controlled coding of video sequences. Background technique [0003] Digital video capabilities can be incorporated into a wide range of devices, including digital televisions, digital broadcast systems, wireless communication devices, personal digital assistants (PDAs), laptop computers, desktop computers, digital cameras, digital recording devices, cellular modem or satellite radiotelephone, etc. Digital video equipment offers significant improvements over conventional analog video systems in the creation, modification, transmission, storage, recording and playback of full-motion video sequences. [0004] Many different video coding standards have been established for coding digital video sequences. For example, the Moving Picture Experts Group (MP...

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Application Information

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IPC IPC(8): H04N7/24
Inventor N・马拉亚斯S・莫洛伊Y・常
Owner QUALCOMM INC
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