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Video codec method, device and generated video code stream

A coding method and code stream technology, applied in the field of video coding and decoding, can solve problems such as coding efficiency constraints, and achieve the effect of improving coding efficiency

Active Publication Date: 2019-12-31
ZHEJIANG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At the same time, in the HEVC marking method, the RADL image cannot be referenced by the post-image, which restricts the coding efficiency, and a new marking scheme is needed to remove this constraint

Method used

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  • Video codec method, device and generated video code stream
  • Video codec method, device and generated video code stream
  • Video codec method, device and generated video code stream

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0031] Such as image 3 As shown, a video encoding method of this embodiment includes the following steps:

[0032] Step 101: Determine whether each image in a certain segment of the image immediately after the random access point in the code stream can be decoded correctly;

[0033] Specifically, a certain segment of image refers to: if there is no other random access point between the random access point and the immediately following sequence end code, all images between the random access point and the immediately following sequence end code; otherwise , All images between the random access point and the next random access point; whether an image can be decoded correctly in this embodiment refers to whether the image can be correct when random access occurs at the random access point decoding. The random access point can be a sequence header or a special image type;

[0034] Step 102: For each image that can be decoded correctly, constrain the selectable range of each reference i...

Embodiment 2

[0045] Such as Figure 4 As shown, a video encoding method of this embodiment includes the following steps:

[0046] Step 201: Determine whether the current image can be decoded correctly;

[0047] Specifically, in this embodiment, whether an image can be decoded correctly refers to whether the image can be decoded correctly when random access occurs to the random access point corresponding to the image, and the corresponding random access point refers to the current The nearest random access point before the image; the judgment method is if each reference image of each inter-image prediction unit of the current image meets the following three conditions in turn: a. When encoding the image, the reference image has a decoded image buffer In the area and can be referenced, b. At the position in the code stream, there is no random access point between the reference image and the current image, c. If the reference image is an image that can be decoded correctly, the current image can b...

Embodiment 3

[0051] Such as Figure 5 As shown, a video decoding method of this embodiment includes the following steps:

[0052] Step 301: Decode information from the image header in the code stream;

[0053] Specifically, the information indicates whether the image corresponding to the image header can be decoded correctly. In this embodiment, whether an image can be decoded correctly refers to whether the image can be correctly decoded when the random access point corresponding to the image is randomly accessed. For decoding, the corresponding random access point refers to the nearest random access point before the current image in the bitstream. If the information indicates that the image can be decoded correctly, the image can be used as a reference image for the subsequent decoded image, and every Each reference picture of an inter-picture prediction unit must meet the following three conditions in turn: a. When decoding the picture, the reference picture is stored in the decoded picture ...

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Abstract

The invention provides a method which can identify whether an image to be decoded after a random access point can be correctly decoded, wherein whether one image can be decoded correctly means whether the image can be decoded correctly when a random access occurs at a random access point corresponding to the image; the corresponding access point means one random access point which is the nearest random access point before the current image in a code stream; and according to the identifier the method can determine whether or not to decode one image and to output the reconstruction sample of the image. By means of the method, a decoding end can jump over the images which cannot be correctly decoded to decode, so that the decoding time is saved, and during the displaying process, can quickly judge which one among the images can be correctly decoded, so that the images which can be displayed can be quickly found out. Compared with an existing identification method, the identification method is more flexible.

Description

Technical field [0001] The invention belongs to the technical field of video coding and decoding, and particularly relates to a video coding and decoding method, device and generated video code stream. Background technique [0002] Random access capability is a necessary capability for the video coding sequence. Users can watch from the random access point of the video, thus enhancing the flexibility of using video streams. A reasonable video stream should be sufficient to discard the data before the random access point, and the subsequent video stream can still be played correctly from a certain point in time. [0003] With the continuous improvement of video coding technology and the continuous enhancement of inter-frame prediction technology, a large amount of redundant information in the video can be well removed. However, due to the flexible reference relationship, the image decoded after the random access point may refer to the data before the random access point. If this k...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H04N19/587H04N19/46H04N19/44
Inventor 虞露何至初
Owner ZHEJIANG UNIV