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Image information encoding and decoding method

專利號
US10091505B2
公開日期
2018-10-02
申請人
LG ELECTRONICS INC.（KR Seoul）
發(fā)明人
Seung Wook Park; Jae Hyun Lim; Jung Sun Kim; Joon Young Park; Young Hee Choi; Byeong Moon Jeon; Yong Joon Jeon
IPC分類
H04N19/117; H04N19/82; H04N19/70; H04N19/186; H04N19/176; H04N19/14; H04N19/139; H04N19/91; H04N19/13
技術(shù)領(lǐng)域
sao,offset,chroma,band,pixels,pixel,prediction,bands,picture,in
地域： Seoul

摘要

The present invention relates to an image information encoding and decoding method and a device for same. One embodiment of an image information encoding method according to the present invention, as an image information encoding method according to another embodiment of the present invention, includes the steps of: generating a restore block; applying a deblocking filter on the restore block; applying a Sample Adaptive Offset (SAO) on the restore block having the deblocking filter applied thereon; and transmitting information on the SAO application. During the applying of the SAO, the SAO is applied to chroma pixels, and during the transmitting of the information, in addition to information on whether the SAO is applied on the chroma pixels, at least one of area information, division information on the SAO coverage area, SAO type information, and SAO offset information is transmitted.

說明書

On the other hand, it may be considered that the SAO is adaptively applied depending on the region to which the SAO is applied, that is, the SAO application unit. Hereinafter, a method of performing an adaptive SAO in the system according to the invention will be described by the band offset and the edge offset.

<Adaptive Application of Band Offset>

FIG. 4 is a diagram illustrating an example of histograms based on characteristics of a predetermined picture. Specifically, FIG. 4 illustrates histograms based on luma characteristics as in FIG. 11(b).

Referring to FIG. 4, it can be seen that a histogram has various distributions depending on the characteristics of a picture. Therefore, a pixel range may be adaptively divided and the band offset may be applied thereto. That is, a method of adaptively setting bands of an intensity range of pixels and applying an offset may be considered.

For example, when histograms of a picture of a corresponding block are concentrated on the central part in the entire intensity range, a method of dividing the central part more densely to set the bands and dividing the side parts less densely to set the bands may be considered. Specifically, when pixels of N bits are concentrated on the central part in the entire intensity range (0 to 2N?1), M bands having small intensity intervals may be set in the central part and L bands having large intensity intervals may be set in the side part.

權(quán)利要求

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