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Encoding and decoding method and device for intra-frame division flag

An encoding method and marking technology, applied in the field of video encoding and decoding, can solve problems such as low compression encoding efficiency

Inactive Publication Date: 2017-09-26
ZTE CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] In view of this, the main purpose of the present invention is to provide a method and device for encoding and decoding intra-frame division flags, which are used to solve the technical problem of low compression encoding efficiency in existing encoding methods

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  • Encoding and decoding method and device for intra-frame division flag
  • Encoding and decoding method and device for intra-frame division flag
  • Encoding and decoding method and device for intra-frame division flag

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Embodiment 1

[0065] In this embodiment, for the problem of low compression efficiency of LCU division flags at depth 0, only LCU addresses or address differences with division flags of 0 are encoded for depth 0, effectively reducing the number of coded bits of division flags at depth 0, and improving compression coding efficiency. In order to implement this technical solution, two syntax elements, split_root_counter and split_root_addr, need to be added to the slice header syntax, wherein, split_root_counter represents the number of LCUs whose root layer LCU division flag of the coded image is 0, and split_root_addr represents the depth of 0 in the coded image The address difference of the LCU without quadtree division is different, and the coding tree syntax (Coding tree syntax) needs to be modified at the same time. The modifications mentioned above are shown in Table 1 and Table 2.

[0066] The Slice header syntax table of the method described in Table 1 Embodiment 1

[0067] ...

Embodiment 2

[0094] In this embodiment, for the problem of low compression efficiency of LCU depth 1 division flags, for depth 1, only the difference in the division mode of adjacent images is encoded, which can effectively reduce the number of coding bits of depth 1 division flags, thereby improving compression coding efficiency. In order to implement this technical solution, it is necessary to modify the Coding tree syntax and add the syntax element diff_split_sum, which represents the difference between the LCU depth 1 division flags at the common position of adjacent frames, as shown in Table 3.

[0095] The Coding tree syntax table of the method described in table 3 embodiment 2

[0096]

[0097] image 3 For the specific processing process of the encoding end of this embodiment, the specific steps are as follows:

[0098] Step 1: Initialize the first LCU address CurrLcuAddr of the current coded image to 0;

[0099] The second step: if each LCU row or column of the encoded image ...

Embodiment 3

[0116] This embodiment aims at the problem that the compression efficiency of LCU depth 0 and depth 1 division flags is not high. For depth 0, only the address or address difference of the LCU whose division flag is 0 is encoded, and for depth 1, only the difference in the division mode of adjacent images is encoded. It can effectively reduce the number of coding bits of division flags of depth 0 and 1, thereby improving compression coding efficiency. In order to implement this technical solution, it is necessary to add syntax elements split_root_counter and split_root_addr to the Slice header syntax, where the former indicates the number of LCUs that do not perform quadtree segmentation on the encoded image, and the latter indicates the number of LCUs that do not perform quadtree segmentation on the encoded image at depth 0 The LCU address is different. At the same time, the syntax element diff_split_sum needs to be added to the Coding tree syntax. This syntax element indicate...

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Abstract

The invention discloses an encoding method of an intra-frame division flag, which is used to solve the technical problem of low compression encoding efficiency of the existing encoding method. The present invention only encodes the LCU address or address difference with the division flag of 0 for depth 0, and only encodes the difference in the division mode of adjacent images for depth 1, thereby effectively reducing the number of coding bits for the division flags of depth 0 and 1, and improving compression coding efficiency .

Description

technical field [0001] The invention belongs to the field of video encoding and decoding, and in particular relates to an encoding and decoding method and device for an intra-frame division flag. Background technique [0002] In order to compress high-resolution video more efficiently, the concept of a coding unit is introduced into the next-generation international video standard - High Efficiency Video Coding (HEVC) under development (2010-2013). Specifically, a frame of image can be divided into several slices, each slice consists of a slice header and slice data, and a slice can include multiple Largest Coding Units (LCUs) ), each LCU can be further divided into smaller coding units CU according to the texture characteristics of the image area, and the division method adopts a recursive quadtree method. For each LCU, except for the maximum depth, there is a division flag for each depth to indicate whether the CU corresponding to the depth (layer) is quadtree-divided. Wh...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H04N19/51H04N19/42H04N19/169H04N19/184
Inventor 李振纲王宁左雯林聚财于培松
Owner ZTE CORP
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