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Method for intra-refresh coding of multiple image frames

An intra-frame coding and image frame technology, which is applied in image communication, digital video signal modification, electrical components, etc., can solve problems such as undesired bit rate costs, and achieve the effect of improving throughput and efficiency

Active Publication Date: 2021-03-26
AXIS
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Problems solved by technology

[0004] However, this approach comes with an undesirable bit rate penalty

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  • Method for intra-refresh coding of multiple image frames
  • Method for intra-refresh coding of multiple image frames
  • Method for intra-refresh coding of multiple image frames

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[0062] The present invention will now be described more fully hereinafter with reference to the accompanying drawings, in which embodiments of the invention are shown. The systems and devices that will be disclosed herein will be described as during operation.

[0063] As mentioned above, periodic intra refresh is an accepted method for removing bit rate spikes that occur once per GOP, ie when an image frame is encoded using intra coding. In an intra-refresh strategy, a periodic intra-refresh pattern is used to define which part of an image frame should be "refreshed" (ie coded without reference to any other image frame), and thus forced to be coded as an intra-coded region.

[0064] An example of this pattern is shown in figure 1 middle. Each example includes three image frames for the entire image frame to be refreshed, but it should be understood that in typical cases the intra-frame refresh pattern cycles over a larger number of image frames (such as 32 or 64, etc.).

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Abstract

The invention discloses a method for intra-frame refresh coding of multiple image frames. The present invention relates to video coding using periodic intra-frame refresh, and in particular to a method and encoder that can adaptively fill intra-coded regions between image frames based on motion in the image frames.

Description

technical field [0001] The present invention relates to video coding using periodic intra-refresh, and more particularly to a method and encoder that can adaptively fill intra-coded regions between image frames based on motion in the image frames. Background technique [0002] A common problem with H.264 encoding (and similar standards) is I-frame bitrate spikes. The problem is generally more severe for surveillance cameras, since there can be a large number of cameras on the same network and a typical surveillance scene has a very large (x10-x100) I-frame to P-frame size ratio. Ideally, the network will prefer a constant bit rate. [0003] One solution to reduce bit rate spikes for cameras is to extend I-frames over multiple image frames and instead force a part of each image frame (the intra-refresh region) to be encoded as an I-block. Moving the intra-frame refresh region across the image frames over a set of image frames, thereby "refreshing" the image. This method is...

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H04N19/107H04N19/176H04N19/583
CPCH04N19/107H04N19/176H04N19/583H04N19/137H04N19/174H04N19/57H04N19/593H04N19/59H04N19/172H04N19/105H04N19/139H04N19/521
Inventor 维克托·埃德帕尔姆玛雅·沙阿
Owner AXIS
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