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

FIG. 5 is a diagram schematically illustrating an example of a method of adaptively dividing an intensity range of the total pixels and applying the band offset thereto. FIG. 5 illustrates an example where pixels are concentrated on the central part.

In the example illustrated in FIG. 5, when the pixel value range, that is, the pixel intensity range have 256 (0 to 28?1) pixel values, the first group in the central part may be densely divided into 16 bands by 4 pixel values (for example, four intensity intervals) and the second group in the side parts may be roughly divided into 12 bands by 16 pixel values.

When histograms of the picture of the corresponding block are concentrated on the side parts in the entire intensity range, the first group in the central part is divided into 12 bands by 16 pixel values and the second group in the side parts may be divided into 16 bands by 4 pixel values.

權(quán)利要求

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