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Conditional signaling of reference picture list modification information

一种信号通知、参考图片的技术，应用在图像通信、数字视频信号修改、电气元件等方向，能够解决消耗、大比特量等问题

Active Publication Date: 2018-01-02
MICROSOFT TECH LICENSING LLC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Signaling modifications for RPL can consume a considerable amount of bits

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  • Conditional signaling of reference picture list modification information
  • Conditional signaling of reference picture list modification information
  • Conditional signaling of reference picture list modification information

Examples

Experimental program
Comparison scheme
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Embodiment Construction

[0026] This detailed description presents innovations in signaling reference picture list ("RPL") modification information. These innovations may help to avoid signaling RPL modification information when the RPL modification information would be useless or when the value of such information can be inferred.

[0027]In some recent codec standards, a reference picture set ("RPS") is a set of reference pictures available for use in motion compensated prediction, and the RPL is constructed from the RPS. For the decoding process of predicted ("P") slices, there is one RPL, referred to as RPL 0. For the decoding process of bidirectionally predicted ("B") slices, there are two RPLs, referred to as RPL 0 and RPL 1 . At the beginning of the decoding process for a P slice, from information available about RPL 0 (such as the reference picture set available at the Modifications signaled in the stream to derive RPL 0. Likewise, at the beginning of the decoding process for a B slice, fro...

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Abstract

Innovations in signaling reference picture list ("RPL") modification information. For example, a video encoder evaluates a condition that depends at least in part on a variable indicative of a number of total reference pictures. Depending on the result of the evaluation, the encoder signals in the bitstream a flag indicating whether the RPL is modified according to syntax elements explicitly signaled in the bitstream. The video decoder evaluates this condition and, depending on the result of the evaluation, parses from the bitstream a flag indicating whether the RPL is modified according to syntax elements explicitly signaled in the bitstream. The condition may be evaluated as part of the processing for the RPL modification structure including flags, or as part of the processing for the slice header. The encoder and decoder may also evaluate other conditions affecting the syntax elements of the list items for RPL modification information.

Description

Background technique [0001] Engineers use compression (also known as source encoding) to reduce the bit rate of digital video. Compression reduces the cost of storing and transmitting video information by converting it to a lower bit rate form. Decompression (also known as decoding) reconstructs a version of the original information from the compressed form. A "codec" is an encoder / decoder system. [0002] Over the past two decades, various video codec standards have been adopted, including H.261, H.262 (MPEG-2 or ISO / IEC 13818-2), H.263 and H.264 (AVC or ISO / IEC 14496-10) standard and MPEG-1 (ISO / IEC11172-2), MPEG-4 Visual (ISO / IEC 14496-2) and SMPTE 421M standards. Recently, the HEVC standard is under development. Video codec standards typically specify options for the syntax of an encoded video bitstream, specifying parameters in the bitstream when specific features are used in encoding and decoding. In many cases, video codec standards also provide details about the d...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H04N19/51H04N19/583H04N19/70H04N19/134H04N19/109H04N19/503
CPCH04N19/105H04N19/46H04N19/503H04N19/70H04N19/134H04N19/109H04N19/573H04N19/58H04N19/174H04N19/85
Inventor G.J.萨利文S.卡努穆里
Owner MICROSOFT TECH LICENSING LLC