US 12,219,152 B2
Image decoding device and image decoding method deriving block filtering strength parameter
Shunichi Sekiguchi, Tokyo (JP); Kazuo Sugimoto, Tokyo (JP); Hiroharu Sakate, Tokyo (JP); Tokumichi Murakami, Tokyo (JP); and Akira Minezawa, Tokyo (JP)
Assigned to MITSUBISHI ELECTRIC CORPORATION, Tokyo (JP)
Filed by Mitsubishi Electric Corporation, Tokyo (JP)
Filed on Oct. 20, 2023, as Appl. No. 18/490,939.
Application 18/490,939 is a division of application No. 18/093,082, filed on Jan. 4, 2023, granted, now 11,831,881.
Application 18/093,082 is a division of application No. 17/083,441, filed on Oct. 29, 2020, granted, now 11,575,906, issued on Feb. 7, 2023.
Application 17/083,441 is a division of application No. 16/399,178, filed on Apr. 30, 2019, granted, now 10,863,180, issued on Dec. 8, 2020.
Application 16/399,178 is a division of application No. 15/868,253, filed on Jan. 11, 2018, granted, now 10,334,251, issued on Jun. 25, 2019.
Application 15/868,253 is a division of application No. 15/479,584, filed on Apr. 5, 2017, granted, now 9,906,795, issued on Feb. 27, 2018.
Application 15/479,584 is a division of application No. 14/707,940, filed on May 8, 2015, granted, now 9,654,773, issued on May 16, 2017.
Application 14/707,940 is a division of application No. 14/110,366, granted, now 9,210,426, issued on Dec. 8, 2015, previously published as PCT/JP2012/003680, filed on Jun. 5, 2012.
Claims priority of application No. 2011-145612 (JP), filed on Jun. 30, 2011.
Prior Publication US 2024/0048720 A1, Feb. 8, 2024
This patent is subject to a terminal disclaimer.
Int. Cl. H04N 19/82 (2014.01); H04N 19/117 (2014.01); H04N 19/14 (2014.01); H04N 19/154 (2014.01); H04N 19/159 (2014.01); H04N 19/176 (2014.01); H04N 19/186 (2014.01); H04N 19/593 (2014.01); H04N 19/61 (2014.01); H04N 19/86 (2014.01); H04N 19/46 (2014.01)
CPC H04N 19/154 (2014.11) [H04N 19/117 (2014.11); H04N 19/14 (2014.11); H04N 19/159 (2014.11); H04N 19/176 (2014.11); H04N 19/186 (2014.11); H04N 19/593 (2014.11); H04N 19/61 (2014.11); H04N 19/82 (2014.11); H04N 19/865 (2014.11); H04N 19/46 (2014.11)] 2 Claims
OG exemplary drawing
 
1. An image decoding device that carries out a decoding process on a coded data obtained by performing a block based coding process on an image, the image decoding device comprising:
a coded data decoder to decode the coded data to acquire compressed data of a difference image, a coding mode associated with each of coding blocks, and an offset, the coding mode indicating a prediction mode and prediction blocks in each of the coding blocks;
a prediction image generator to carry out a prediction process for each of the coding blocks according to the coding mode to generate a prediction image of each of the coding blocks;
a decoded image generator to add a decompressed difference image to the prediction image for each of the coding blocks to generate a decoded image;
an image distortion remover to carry out a filtering process on the decoded image to remove a block distortion occurring at a boundary between adjacent prediction blocks of the decoded image, the prediction block corresponding to the coding block hierarchically divided from a maximum size of a coding block; and
a memory to store decoded pixel values for outputting the decoded image on which the filtering process has been carried out,
wherein the image distortion remover determines whether a vertical edge or a horizontal edge of the coding block expressed by K*K pixel grid overlaps the boundary, and derives, in a case that the vertical edge or the horizontal edge overlaps the boundary, a parameter of the coding block specifying filtering strength as a default value for the offset according to a set of conditions including whether the coding mode corresponding to at least one of the adjacent prediction blocks to which the filtering process is to be applied is intra prediction mode, and the offset is added to a value of the parameter in a process of selecting from different filtering processes.