Selection of motion vector precision

A precision, selected technology, applied in the direction of image communication, digital video signal modification, electrical components, etc.

Active Publication Date: 2016-08-24
MICROSOFT TECH LICENSING LLC
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Problems solved by technology

However, in certain encoding scenarios, the encoder-side decision about which MV precision to use cannot be efficiently made

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  • Selection of motion vector precision

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Embodiment Construction

[0023] The detailed description presents innovations in selecting motion vector ("MV") precision during encoding. These methods can facilitate compression that is efficient in terms of rate-distortion performance and / or computational efficiency. For example, a video encoder determines an MV precision for a unit of video from a plurality of MV precisions, including one or more of fractional sample MV precision and integer sample MV precision. The video encoder may identify a set of MV values ​​with fractional sample MV precision, and then select the MV precision for the unit based at least in part on the prevalence (within the set) of MV values ​​with fractional parts of zero. Alternatively, the video codec may perform rate-distortion analysis, where the rate-distortion analysis is biased towards integer-sample MV precision. Alternatively, the video codec may collect information about the video and select an MV precision for a unit based at least in part on the collected infor...

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Abstract

Approaches to selection of motion vector ("MV") precision during video encoding are presented. These approaches can facilitate compression that is effective in terms of rate-distortion performance and / or computational efficiency. For example, a video encoder determines an MV precision for a unit of video from among multiple MV precisions, which include one or more fractional-sample MV precisions and integer-sample MV precision. The video encoder can identify a set of MV values having a fractional-sample MV precision, then select the MV precision for the unit based at least in part on prevalence of MV values (within the set) having a fractional part of zero. Or, the video encoder can perform rate-distortion analysis, where the rate-distortion analysis is biased towards the integer-sample MV precision. Or, the video encoder can collect information about the video and select the MV precision for the unit based at least in part on the collected information.

Description

Background technique [0001] Engineers use compression (also known as source encoding or source decoding) to reduce the bit rate of digital video. Compression reduces the cost of storing and transmitting video information by converting the information to a lower bit rate form. Decompression (also called 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 ITU-TH.261, H.262 (MPEG-2 or ISO / IEC 13818-2), H.263 and H.264 (MPEG -4AVC or ISO / IEC 14496-10) standard, MPEG-1 (ISO / IEC 11172-2) and MPEG-4 Vision (ISO / IEC 14496-2) standard, and SMPTE 421M (VC-1) standard. Recently, the HEVC standard (ITU-T H.265 or ISO / IEC 23008-2) was approved. Extensions to the HEVC standard are currently being developed (for example, for scalable video encoding / decoding, for encoding / decoding video with higher fidelity in terms of sa...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04N19/109H04N19/136H04N19/174H04N19/42
CPCH04N19/109H04N19/136H04N19/174H04N19/42H04N19/139H04N19/147H04N19/177H04N19/17H04N19/179H04N19/523H04N19/105H04N19/52H04N19/70H04N19/169H04N19/142H04N19/521
Inventor G·J·沙利文Y·周李明杰C-L·林
Owner MICROSOFT TECH LICENSING LLC
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