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Video decoding method and device for video encoding

A video decoding and encoding technology, applied in the field of digital video decoding

Active Publication Date: 2013-09-25
QUALCOMM INC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, full re-encoding of all video blocks during the second decoding pass is computationally intensive

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  • Video decoding method and device for video encoding
  • Video decoding method and device for video encoding
  • Video decoding method and device for video encoding

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Embodiment Construction

[0024] This disclosure describes techniques for second pass video coding in a multi-pass video coding scenario. The second video coding pass refines the video coding performed in the first pass to meet bit rate constraints, take advantage of unused bandwidth, or for other purposes. In this disclosure, the second decoding pass generally refers to any subsequent decoding pass after the first decoding pass. Thus, the term "second" in the phrase "second coding pass" does not imply any ordering relationship with other coding passes, except that the second pass is performed after the first coding pass. As described herein, the second coding pass may be virtually any subsequent coding pass, such as a third or fourth coding pass after the first coding pass.

[0025] According to this disclosure, the coding modes used for some video blocks in the second coding pass may be changed relative to the coding modes used in the first pass. However, for video blocks with mode changes, the mot...

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Abstract

This disclosure describes techniques for second pass video coding in a multi-pass video coding scenario. The coding modes for some video blocks encoded during a second pass may be changed relative to the coding modes used for such video blocks in the first pass. However, motion information does not change for those video blocks that have the changed modes. In particular, mode changes can be made in the second coding pass relative to the modes used in the first coding pass without changing the manner in which motion information will be derived at the decoder, e.g., due to similarities between the original modes of the first pass and changed modes used in the second pass. The second pass coding techniques may also include quantization parameter adjustments, and the mode changes can cause such quantization parameter adjustments to have more profound refinements effects on the second pass coding.

Description

[0001] Related applications [0002] This application claims the benefit of US Provisional Application No. 60 / 892,804, filed March 2, 2007, which is hereby incorporated by reference in its entirety. technical field [0003] The present invention relates to digital video coding, and more particularly, to multi-pass video coding where a first pass is used to code a video block and a second pass refines the coding to comply with bit rate constraints or for other purposes. . Background technique [0004] Digital video capabilities can be incorporated into a wide range of devices including digital television, digital live broadcast systems, wireless communication devices, wireless broadcast systems, personal digital assistants (PDAs), laptop or desktop computers, digital cameras, digital recording devices , video game equipment, video game consoles, cellular or satellite radiotelephones, etc. Digital video devices implement video compression techniques such as MPEG-2, MPEG-4 o...

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H04N7/26H04N7/50
CPCH04N19/00781H04N19/00278H04N19/00187H04N19/00236H04N19/0009H04N19/00175H04N19/00036H04N19/00351H04N19/00363H04N19/176H04N19/147H04N19/15H04N19/61H04N19/109H04N19/124H04N19/164H04N19/19H04N19/194H04N19/103H04N19/51
Inventor 陈培松帕尼库马尔·巴米迪帕提西塔拉曼·加纳帕蒂·苏布拉马尼安阿米特·罗哈吉塞伊富拉·哈利特·奥古兹斯科特·T·斯韦泽伊
Owner QUALCOMM INC