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Image encoding/decoding method and device for limiting size of chroma block, and method for transmitting bitstream

An image decoding and image encoding technology, applied in image communication, digital video signal modification, electrical components and other directions, can solve the problems of transmission information or bit amount transmission cost and storage cost increase, improve encoding/decoding efficiency, reduce bit The effect of traffic

Pending Publication Date: 2022-03-04
LG ELECTRONICS INC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

An increase in the amount of transmitted information or bits leads to an increase in transmission costs and storage costs

Method used

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  • Image encoding/decoding method and device for limiting size of chroma block, and method for transmitting bitstream
  • Image encoding/decoding method and device for limiting size of chroma block, and method for transmitting bitstream
  • Image encoding/decoding method and device for limiting size of chroma block, and method for transmitting bitstream

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0269] As described above, the encoding device and the decoding device can limit the division of the chroma block into a size of 2×N. For example, an encoding / decoding device may limit the minimum width of a chroma block to a length of 4 samples. To this end, an encoding / decoding apparatus according to an embodiment may determine whether a predetermined partition mode is allowed for a current block based on whether the current block is a chroma block or a width of the current block. Hereinafter, a decoding device will be described, but the following description is correspondingly applicable to an encoding device.

[0270] Figure 23 is a view illustrating a method of determining whether vertical trident splitting (SPLIT_TT_VER) is permitted for a current block by a decoding device. The decoding device according to an embodiment may determine whether a current block is a chroma block (S2310). The decoding device may check a value of a cIdx parameter designating a color compo...

Embodiment 2

[0278] As mentioned above, the minimum height of a chroma block needs to be limited to a length of four samples. In the following, reference will be made to Figure 24 A method of restricting the horizontal trisection for the current block by the encoding / decoding apparatus according to the embodiment in order to restrict the minimum height of the chroma block is described. Hereinafter, a decoding device will be described, but the following description can also be applied to an encoding device.

[0279] Figure 24 is a view illustrating a method of determining whether horizontal trident splitting (SPLIT_TT_HOR) is permitted for a current block by a decoding device. The decoding device according to an embodiment may determine whether a current block is a chroma block (S2410). As described above, the decoding apparatus may check the value of the cIdx parameter designating the color component of the current block to determine whether the current block is a chroma block.

[02...

Embodiment 3

[0286] As mentioned above, the minimum height of a chroma block needs to be limited to a length of four samples. In the following, reference will be made to Figure 25 A method of restricting the horizontal binary segmentation of the current block so as to restrict the minimum height of the chroma block by the encoding / decoding apparatus according to the embodiment is described. Hereinafter, a decoding device will be described, but the following description can also be applied to an encoding device.

[0287] Figure 25 is a view illustrating a method of determining whether horizontal binary splitting (SPLIT_BT_HOR) is permitted for a current block by a decoding device. The decoding device according to an embodiment may determine whether a current block is a chroma block (S2510). As described above, the decoding apparatus may check the value of the cIdx parameter designating the color component of the current block to determine whether the current block is a chroma block.

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Abstract

An image encoding / decoding method and apparatus are provided. An image decoding method performed by an image decoding apparatus includes determining a division type of a current block, dividing the current block into a plurality of lower layer blocks based on the division type, and decoding the lower layer blocks. In this case, the current block may be a chroma block, and determination of a partition type of the current block may be performed by not allowing a predetermined type in which a width or height of a lower block among a plurality of partition types is a predetermined value.

Description

technical field [0001] The present disclosure relates to an image encoding / decoding method and apparatus, and more particularly, to a method and apparatus for encoding / decoding an image using size constraints of chroma blocks, and an image encoding method transmitted by the present disclosure. Method / means for generating bitstreams. Background technique [0002] Recently, demands for high-resolution and high-quality images, such as high-definition (HD) images and ultra-high-definition (UHD) images, are increasing in various fields. As the resolution and quality of image data increase, the amount of information or bits to be transmitted relatively increases compared with existing image data. An increase in the amount of transmitted information or bits leads to an increase in transmission costs and storage costs. [0003] Therefore, efficient image compression techniques are required to efficiently transmit, store, and reproduce information about high-resolution and high-qua...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04N19/122H04N19/176H04N19/186H04N19/44H04N19/503
CPCH04N19/122H04N19/176H04N19/186H04N19/44H04N19/503H04N19/119H04N19/96H04N19/70
Inventor 崔璋元许镇柳先美崔情娥金昇焕
Owner LG ELECTRONICS INC