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Refinement coefficient coding based on history of corresponding transform coefficient values

A technology for refining coefficients and refining coefficients, which is applied in the field of digital video decoding and can solve problems such as reducing the bit rate

Inactive Publication Date: 2013-01-30
QUALCOMM INC
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Problems solved by technology

[0008] Video encoders typically apply transform, quantization, and transform coefficient decoding processes to further reduce the bit rate associated with the communication of residual blocks

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  • Refinement coefficient coding based on history of corresponding transform coefficient values
  • Refinement coefficient coding based on history of corresponding transform coefficient values
  • Refinement coefficient coding based on history of corresponding transform coefficient values

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Embodiment Construction

[0030] This disclosure describes techniques for coding refinement coefficients of an enhancement layer in a scalable video coding (SVC) scheme. A refinement coefficient refers to a transform coefficient of an enhancement layer for which a corresponding coefficient of a previous layer in the SVC scheme has a non-zero value. In contrast, important coefficients refer to transform coefficients of an enhancement layer for which corresponding coefficients of previous layers in the SVC scheme have zero values. The term "transform coefficients" is used herein to refer to both refinement coefficients and significant coefficients, and generally refers to coefficients produced by a transform process such as discrete cosine transform (DCT). Coding of refinement coefficients may be performed separately from coding of important coefficients. Coding of refinement and significant coefficients typically involves variable length coding (VLC) methods, where different sets of coefficients are ma...

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Abstract

This disclosure describes techniques for coding of refinement coefficients of an enhancement layer in a scalable video coding (SVC) scheme. According to this disclosure, a method may comprise evaluating a history of transform coefficient values associated with one or more previous layers of the SVC scheme, and estimating one or more refinement coefficient values associated with a current layer ofthe SVC scheme based on the history. On the encoding side, the coding process may include excluding information for one or more refinement coefficient values from the bitstream and signaling to the decoder that such information is excluded from the bitstream. On the decoding side, coding process include parsing the bitstream to identify information that signals to the decoder that information is excluded from the bitstream, and generating such information based on the history associated with one or more previous layers of the SVC scheme.

Description

[0001] This application claims the benefit of the following U.S. Provisional Applications, each of which is incorporated herein by reference in its entirety: [0002] U.S. Provisional Application No. 60 / 829,274, filed October 12, 2006, [0003] U.S. Provisional Application No. 60 / 883,741 filed January 5, 2007, and [0004] U.S. Provisional Application No. 60 / 829,276, filed October 12, 2006. technical field [0005] This disclosure relates to digital video coding, and more particularly, to coding transform coefficients in enhancement layers of scalable video coding (SVC) schemes. Background technique [0006] Digital video capabilities can be incorporated into a wide range of devices, including digital television, digital broadcast systems, wireless communication devices, wireless broadcast systems, personal digital assistants (PDAs), laptop or desktop computers, digital cameras, digital recording devices , video game devices, video game consoles, cellular or satellite radi...

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H04N7/26H04N7/50H04N19/13H04N19/187H04N19/33H04N19/34
Inventor 马尔塔·卡切维奇
Owner QUALCOMM INC
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