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Time-domain gradable video encoding method for implementing real-time double-frame reference

A video coding and time-domain technology, applied in the field of video coding, to achieve the effect of flexible expansion and delay limitation

Inactive Publication Date: 2008-07-16
WUHAN UNIV
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Problems solved by technology

[0009] (1) Compatibility with non-scalable coding standards
[0010] (2) Reference frame management issues
[0011] (3) Coding efficiency and delay issues

Method used

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  • Time-domain gradable video encoding method for implementing real-time double-frame reference
  • Time-domain gradable video encoding method for implementing real-time double-frame reference
  • Time-domain gradable video encoding method for implementing real-time double-frame reference

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Embodiment Construction

[0029] The present invention provides a time-domain scalable video coding method that realizes real-time double-frame reference, specifically: the video image coding sequence is consistent with the display sequence, and the current frame uses at most two reference frames during the coding process, and the coded The code stream is hierarchical in the time domain. When encoding, first calculate the temporal layer of the current image according to the display order of the currently encoded image, and then obtain the reference image of the current frame according to the reference frame selection strategy. After the current image is encoded, update the reference frame buffer according to the reference frame update strategy.

[0030] The present invention will be further described below in conjunction with the embodiments and accompanying drawings, but the present invention is not limited.

[0031]The invention provides a real-time dual-frame reference implementation method of time-...

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Abstract

The invention discloses a time domain gradable video coding method which can realize the real time dual frame reference. The method does not use or seldom uses a bidirectional prediction frame in the coding process. In the coding process, a current frame can use two reference frames at most; therefore, a coded bit rate has the hierarchy on the time domain and can satisfy the requirements of the frame rate adjustment and the time delay limitation. The realization method is as follows: according to the display sequence of a current coding image, the time domain level of the current image is calculated; next, according to a reference frame choosing strategy in the invention, a reference image of the current frame is obtained; after the current image is coded, a reference frame cache is updated according to a reference frame updating strategy in the invention. The invention can realize the time domain gradable coding of the real time dual frame reference video stream and ensures that the frame rate of the bit rate can be flexed flexibly; moreover, compared with the prior coding standard, the invention can limit the time delay.

Description

technical field [0001] The invention belongs to the field of video coding, in particular to a method for implementing low-delay time-domain scalable video coding. Background technique [0002] With the continuous development of Internet technology, the ubiquitous Internet provides a broad platform for video services, but the Internet itself has the characteristics of network heterogeneity, bandwidth fluctuation, and unreliability in transmission. , which poses a new challenge to video coding technology. In order to overcome these shortcomings of the Internet, Scalable Video Coding (SVC, Scalable Video Coding) is a good choice. The scalability of scalable video coding techniques generally includes temporal scalability, spatial scalability, quality scalability and a combination of these options (see reference 1). [0003] Scalability in the time domain requires that the code stream has frame rate variability to meet different network conditions and different terminal equipme...

Claims

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Application Information

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IPC IPC(8): H04N7/26H04N7/32H04N19/30H04N19/31
Inventor 胡瑞敏牟晓弦王启军兰诚栋刘琼
Owner WUHAN UNIV
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