Method, apparatus and system for encoding and decoding video data

A coding and coefficient technology, applied in the direction of digital video signal modification, image communication, selective content distribution, etc., can solve existing problems

Active Publication Date: 2020-02-04
CANON KK
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  • Abstract
  • Description
  • Claims
  • Application Information

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However, decisions about quantification remain

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  • Method, apparatus and system for encoding and decoding video data
  • Method, apparatus and system for encoding and decoding video data
  • Method, apparatus and system for encoding and decoding video data

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Embodiment Construction

[0075] Where reference is made to steps and / or features with the same reference number in any one or more figures, such steps and / or features have the same function or operation for the purposes of this description unless an intention to the contrary appears.

[0076] figure 1 is a schematic block diagram showing the functional modules of the subframe delay video encoding and decoding system 100 . The rate control and buffer management mechanisms in the encoding and decoding system 100 ensure that for incoming video data towards the video encoder 114 no changes occur (e.g., due to variations in complexity and time required for an encoder search of possible modes). ) buffer underrun and resulting failure to transmit decoded video, such that decoded video frames from video decoder 134 are transmitted according to the timing of the interface via which the video frames are transmitted. The rate control mechanism can reduce encoder complexity by utilizing the estimated (worst case...

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Abstract

A method of encoding video data into a video bitstream having a plurality of precincts. The method comprises generating a plurality of coding cost estimates (1106) for a current precinct of the plurality of precincts by testing a corresponding candidate coefficient truncation level for the current precinct, each of the coding cost estimates being an over estimate of an encoded data size for codingthe current precinct at the candidate truncation level and being determined using a most significant bit plane index, wherein each of the coding cost estimates is independent of a value of coefficient bits in the current precinct. The method also comprises selecting (1110) one of the candidate truncation levels according to the corresponding coding cost estimate and a budgeted coding cost for thecurrent precinct, the budgeted coding cost representing an allowable size of encoding the precinct; and encoding (1113) the current precinct of video data into the video bitstream using the selectedtruncation level to generate the video bitstream.

Description

technical field [0001] The present invention relates generally to digital video signal processing, and more particularly to methods, devices and systems for encoding and decoding video data. The invention also relates to a computer program product comprising a computer readable medium on which a computer program for encoding and decoding video data is recorded. Background technique [0002] There are currently many applications for video encoding including applications for transmitting and storing video data. A number of video coding standards have also been developed and others are currently under development. Video compression research has focused on "distribution codecs" (ie, codecs for distributing compressed video data to geographically dispersed audiences). However, an emerging field of research is directed to "mezzanine codecs". Mezzanine codecs are used for highly localized distribution, ie within broadcast studios. Mezzanine codecs are characterized by ultra-low...

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Application Information

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IPC IPC(8): H04N21/234H04N19/132H04N19/645
CPCH04N19/124H04N19/146H04N19/174H04N19/645H04N21/234H04N21/236
Inventor克里斯托弗·詹姆斯·罗斯沃恩安德鲁·J·朵莱尔
OwnerCANON KK