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Rate control techniques for video encoding using parametric equations

A technology of video coding and equations, applied in the field of digital video processing, which can solve the problem of damaging transmission frames and so on

Inactive Publication Date: 2008-01-23
QUALCOMM INC
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  • Claims
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Problems solved by technology

However, if the QP is too small, the number of bits encoded per second may exceed the allocated bandwidth and impair the ability to transmit frames within that limited-sized bandwidth

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  • Rate control techniques for video encoding using parametric equations
  • Rate control techniques for video encoding using parametric equations
  • Rate control techniques for video encoding using parametric equations

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Embodiment Construction

[0021] This invention describes rate control techniques that can be used to improve video coding. The technology can be used with any of various video coding standards (for example, MPEG-4 standard, ITU H.263, ITU H.264 standard, or other standards). The technique utilizes the relationship between the number of bits (encoding rate) coded per frame and the number of non-zero coefficients of the video block of the quantized frame. The number of non-zero coefficients of the video block of the quantized frame is called rho(ρ). The value of ρ is roughly proportional to the quantization parameter (QP) used in video coding. Correspondingly, the present invention describes a technique for realizing rate-controlled video coding by using the relationship between p and QP.

[0022] More specifically, the technique described in the present invention utilizes a parameter equation that maps the predicted value of p to a quantization parameter (QP). Since ρ is roughly proportional to the coding ...

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Abstract

This disclosure describes rate control techniques that can improve video encoding. The described rate control techniques exploit relationships between the number of bits encoded per frame and the umber of non-zero coefficients of the video blocks after quantization is referred to as rho (p). The value of p is generally proportional to the number of bits used in the video encoding. This disclosure utilizes a relationship between p and a quantization parameter (QP) in order to achieve rate controlled video encoding. More specifically, this disclosure exploits a parametric equation to map a value oe a predicted p to a QP.

Description

Technical field [0001] This application claims the rights based on the U.S. Patent Application No. 60 / 631,835 filed on November 29, 2004. [0002] The present invention relates to digital video processing, and more specifically, to rate-controlled encoding of video sequences. Background technique [0003] Digital video functions can be included in a variety of devices, including digital televisions, digital direct broadcasting systems, wireless communication devices, personal digital assistants (PDAs), laptop computers, desktop computers, digital cameras, and digital recording devices , Mobile phones or satellite radio phones, and similar devices. Digital video devices can provide significant improvements over conventional analog video systems in terms of forming, modifying, transmitting, storing, recording, and playing full-motion video sequences. [0004] Several different video coding standards have been developed for coding digital video sequences. For example, the Moving Pic...

Claims

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Application Information

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IPC IPC(8): H04N7/26H04N7/30H04N19/124H04N19/14H04N19/149H04N19/172H04N19/176H04N19/192
Inventor 普拉桑吉特·潘达
Owner QUALCOMM INC
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