US-12621488-B2 - Method and apparatus for decoding video signal

US12621488B2US 12621488 B2US12621488 B2US 12621488B2US-12621488-B2

Abstract

A method and apparatus for decoding a video signal are disclosed. A method for decoding a video signal includes obtaining block type information of a current block, confirming a prediction mode of the current block based on the block type information, obtaining, if the prediction mode of the current block is an intra prediction mode according to the prediction mode, at least one correlation parameter information using at least one neighboring pixel of the current block, obtaining an intra prediction value of the current block using the correlation parameter information, and reconstructing the current block using the intra prediction value of the current block.

Inventors

Jae Won Sung
Seung Wook Park
Yong Joon Jeon
Jung Sun Kim
Young Hee Choi
Byeong Moon Jeon
Joon Young Park

Assignees

LG ELECTRONICS INC.

Dates

Publication Date: 20260505
Application Date: 20240620
Priority Date: 20090507

Claims (3)

1 . An image decoding method performed by an image decoding apparatus, the image decoding method comprising: determining an intra prediction mode of a current block; and based on the intra prediction mode of the current block being a horizontal mode or a vertical mode, obtaining a prediction value of a current pixel within the current block based on a first reference pixel contiguous to a left side of the current block, a second reference pixel contiguous to an upper side of the current block and a third reference pixel contiguous to an upper-left side of the current block.
2 . An image encoding method performed by an image encoding apparatus, the image encoding method comprising: determining an intra prediction mode of a current block; and based on the intra prediction mode of the current block being a horizontal mode or a vertical mode, obtaining a prediction value of a current pixel within the current block based on a first reference pixel contiguous to a left side of the current block, a second reference pixel contiguous to an upper side of the current block and a third reference pixel contiguous to an upper-left side of the current block.
3 . A method for transmitting a bitstream which is generated by an image encoding method, the image encoding method comprising: determining an intra prediction mode of a current block; and based on the intra prediction mode of the current block being a horizontal mode or a vertical mode, obtaining a prediction value of a current pixel within the current block based on a first reference pixel contiguous to a left side of the current block, a second reference pixel contiguous to an upper side of the current block and a third reference pixel contiguous to an upper-left side of the current block.

Description

CROSS-REFERENCE TO RELATED APPLICATIONS This application is a continuation of U.S. application Ser. No. 17/831,919, filed on Jun. 3, 2022, which is a continuation of U.S. application Ser. No. 17/100,162, filed on Nov. 20, 2020, now U.S. Pat. No. 11,375,234, which is a continuation of U.S. application Ser. No. 16/780,336, filed on Feb. 3, 2020, now U.S. Pat. No. 10,880,575, which is a continuation of U.S. patent application Ser. No. 16/210,700, filed Dec. 5, 2018, now U.S. Pat. No. 10,555,003, which is a continuation of U.S. patent application Ser. No. 15/441,591, filed Feb. 24, 2017, now U.S. Pat. No. 10,306,263, which is a continuation of U.S. patent application Ser. No. 15/007,896, filed Jan. 27, 2016, now U.S. Pat. No. 9,756,358, which is a continuation of U.S. patent application Ser. No. 12/991,210, filed Dec. 21, 2010, now U.S. Pat. No. 9,277,244, which is a National Phase of International Patent Application No. PCT/KR2009/002403, filed May 7, 2009, which claims the benefit of U.S. Provisional Patent Application Nos. 61/051,343 and 61/102,012 filed on May 7, 2008 and Oct. 2, 2008, respectively, which claims the benefit of Korean Patent Application No. 10-2009-0039683 filed on May 7, 2009, all of which are incorporated by reference as if fully set forth herein. BACKGROUND OF THE INVENTION Field of the Invention The present invention relates to a method and apparatus for decoding a video signal. Discussion of the Related Art Generally, compression coding indicates a series of signal processing technologies which can transmit digitized information through a communication line or can store the digitized information in a specific form suitable for a storage medium. A variety of objects can be compression-coded, for example, sound data, image (or video) data, text data, etc. Particularly, technology for compression encoding image data is called image compression technology. Video data is characterized in that it has spatial redundancy and temporal redundancy. Likewise, if the spatial redundancy and the temporal redundancy are not fully removed, a compression rate is reduced while a video signal is coded. In addition, if the spatial redundancy and the temporal redundancy are excessively removed, it is impossible to generate information required for decoding the video signal, resulting in deterioration of a recovery rate. SUMMARY OF THE INVENTION Accordingly, the present invention is directed to a method and apparatus for decoding a video signal that substantially obviates one or more problems due to limitations and disadvantages of the related art. An object of the present invention is to provide a method and apparatus for decoding a video signal so as to increase coding efficiency of the video signal. Additional advantages, objects, and features of the invention will be set forth in part in the description which follows and in part will become apparent to those having ordinary skill in the art upon examination of the following or may be learned from practice of the invention. The objectives and other advantages of the invention may be realized and attained by the structure particularly pointed out in the written description and claims hereof as well as the appended drawings. To achieve these objects and other advantages and in accordance with the purpose of the invention, as embodied and broadly described herein, a method for decoding a video signal includes obtaining block type information of a current block, confirming a prediction mode of the current block based on the block type information, obtaining, if the prediction mode of the current block is an intra prediction mode according to the confirmed prediction mode, at least one correlation parameter information using a reference pixel, obtaining an intra prediction value of the current block using the correlation parameter information, and reconstructing the current block using the intra prediction value of the current block. The reference pixel may include at least one pixel which is adjacent to a left side, an upper side, a left upper side, and a right upper side of the current block. The reference pixel may be a filtering-processed pixel when the prediction mode of the current block is an intra 8×8 prediction mode. The correlation parameter information may be obtained using a difference between pixels adjacent to the current block. If the prediction mode of the current block is a vertical prediction mode, the correlation parameter information may be obtained using a pixel value adjacent to a left side of the current block. An intra prediction value of a current pixel in the current block may be obtained using vertical coordinates of the current pixel, the correlation parameter information, and a pixel value adjacent to an upper side of the current block. If the prediction mode of the current block is a horizontal prediction mode, the correlation parameter information may be obtained using a pixel value adjacent to an upper side of the current block.