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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
技術領域
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

The offset values of the indices (1, 2, . . . , K) allocated to the respective bands may be transmitted from the encoder to the decoder. The indices of the offset values for the side bands to which the band offset is not applied may be set to 0 and the offset for the chroma pixels may not be indicated. An index having a value of 0 may indicate that the band offset should not be applied thereto, or may indicate that the offset value of the band offset is 0.

FIG. 13 is a diagram schematically illustrating another example where a band offset is applied to only some bands of the total bands for the chroma pixels.

Referring to FIG. 12, chroma pixels may be allocated to the remaining band including K bands at the sides out of the total 2*K bands and the band offset may be applied thereto.

The offset values of the indices (1, 2, . . . , K/2, K/2+1, . . . , K) allocated to the respective bands may be transmitted from the encoder to the decoder. The indices of the offset values for the central bands to which the band offset is not applied may be set to 0 and the offset for the chroma pixels may not be indicated. An index having a value of 0 may indicate that the band offset should not be applied thereto, or may indicate that the offset value of the band offset is 0.

In the examples illustrated in FIGS. 12 and 13, when it is assumed that the value of K is set to 16, the entire pixel value range may be divided into 32 bands, the bands may be classified into two groups of 16 bands at the center and the 16 bands at the side, and the band offset may be applied thereto.

權利要求

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