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Quantization based on rate-distortion modeling for cabac coders

A technology for encoding and quantizing coefficients, which is applied in the field of quantization technology in the video encoding process and can solve problems such as complex processing

Inactive Publication Date: 2010-12-08
QUALCOMM INC
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

CABAC generally compresses data more efficiently than other entropy coding techniques such as Content Adaptive Variable Length Coding (CAVLC) techniques, but may require significantly more complex processing on the decoder side

Method used

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  • Quantization based on rate-distortion modeling for cabac coders
  • Quantization based on rate-distortion modeling for cabac coders
  • Quantization based on rate-distortion modeling for cabac coders

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Embodiment Construction

[0022] figure 1 is a block diagram illustrating one exemplary video encoding and decoding system 10 that may implement techniques of this disclosure. Such as figure 1As shown in , system 10 includes source device 12 that transmits encoded video to destination device 16 via communication channel 15 . Source device 12 and destination device 16 may comprise any of a wide range of devices. In some cases, source device 12 and destination device 16 comprise wireless communication devices, such as wireless handsets, so-called cellular or satellite radiotelephones, or any wireless device that can transmit video information over communication channel 15, in which case , the communication channel 15 is wireless. However, the techniques of this disclosure, which relate to quantization, are not necessarily limited to wireless applications or settings.

[0023] exist figure 1 In an example, source device 12 may include video source 20 , video encoder 22 , modulator / demodulator (modem)...

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Abstract

This disclosure describes techniques for quantizing coefficients of a video block for a video coding process that supports context-based adaptive binary arithmetic coding (CABAC). A method may comprise generating a plurality of sets of quantized coefficients for the video block, wherein each of the sets of quantized coefficients is defined based on an assumption that a particular one of the coefficients of the video block corresponds to a last non-zero coefficient of the video block, estimating a plurality of costs associated with coding the video block via the CABAC, wherein the estimated costs are based respectively on different ones of the sets of quantized coefficients, and selecting a given one of the sets of quantized coefficients associated with a lowest cost.

Description

[0001] This application claims the benefit of U.S. Provisional Application No. 61 / 019,830, filed January 8, 2008, and U.S. Provisional Application No. 61 / 030,454, filed February 21, 2008, both of which The entire contents are incorporated herein by reference. technical field [0002] The present invention relates to digital video coding, and more particularly to quantization techniques for video coding processes supporting Context-Based Adaptive Binary Arithmetic Coding (CABAC). Background technique [0003] Digital video capabilities can be incorporated into a wide range of devices, including digital television, digital broadcast systems, wireless broadcast systems, personal digital assistants (PDAs), laptop or desktop computers, digital cameras, digital recording devices, video games devices, video game consoles, cellular or satellite radiotelephones, and the like. Digital video devices implement video compression techniques such as MPEG-2, MPEG-4 or ITU-T H.264 / MPEG-4, P...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04N7/26
CPCH04N7/26079H04N7/26308H04N7/26244H04N7/26154H04N7/26111H04N19/124H04N19/132H04N19/147H04N19/176H04N19/18H04N19/19H04N19/91H04N19/13
Inventor 马尔塔·卡切维奇叶琰
Owner QUALCOMM INC
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