公开(公告)号：US10511859B2

公开(公告)日：2019-12-17

申请号：US15404313

申请日：2017-01-12

Applicant: MEDIATEK INC.

Inventor： Li-Heng Chen ,  Tung-Hsing Wu ,  Han-Liang Chou

IPC: H04N19/593 ,  H04N19/174 ,  H04N19/182 ,  H04N19/105 ,  H04N19/147 ,  H04N19/91 ,  H04N19/124 ,  H04N19/14

Abstract: A method and apparatus of image coding including a no-residue prediction mode are disclosed. At the encoder side, current predictors for a current coding unit are determined according to a target prediction process associated with a target prediction mode. The current predictors are determined based on pixel data including reconstructed pixels in the current slice or the current image. The target prediction process is applied to the current coding unit using the current predictors to generate prediction residues. A distortion condition or a cost measure for the prediction residues is determined. If the distortion condition is satisfied or the cost measure favors coding without the prediction residues, the current coding unit is encoded into current compressed bits of the current coding unit without compressed data associated with the prediction residues. A corresponding decoding method and apparatus are also disclosed.

公开(公告)号：US20190007680A1

公开(公告)日：2019-01-03

申请号：US16004419

申请日：2018-06-10

Applicant: MEDIATEK INC.

Inventor： Li-Heng Chen ,  Lien-Fei Chen ,  Tung-Hsing Wu ,  Han-Liang Chou

IPC: H04N19/119 ,  H04N19/174 ,  H04N19/159 ,  H04N19/184 ,  H04N19/147 ,  H04N19/91 ,  H04N19/436

Abstract: A video encoder includes a video encoding circuit and a slice decision circuit. The video encoding circuit encodes a first slice in a frame according to a first coding unit boundary between an end of the first slice and a start of a second slice in the frame, and outputs a first bitstream of the first slice. The slice decision circuit predicts the first coding unit boundary before a bitstream of a last coding unit of the first slice is generated by the video encoding circuit, and informs the video encoding circuit of the first coding unit boundary. The video encoding circuit refers to the first coding unit boundary predicted by the slice decision circuit to ensure that a bitstream size of the first bitstream is constrained by a predetermined bitstream size threshold.

公开(公告)号：US20170339423A1

公开(公告)日：2017-11-23

申请号：US15595933

申请日：2017-05-15

Applicant: MEDIATEK INC.

Inventor： Li-Heng Chen ,  Tung-Hsing Wu ,  Han-Liang Chou

IPC: H04N19/50 ,  H04N19/70 ,  H04N19/436 ,  H04N19/124 ,  H04N19/103 ,  H04N19/184 ,  H04N19/176 ,  H04N19/182 ,  H04N19/186

CPC classification number: H04N19/176 ,  H04N19/103 ,  H04N19/147 ,  H04N19/436

Abstract: One exemplary image encoding method for encoding an image includes following steps: calculating a mean value of each color channel of a plurality of reconstructed pixels; determining a first predictor used by a first candidate coding mode of a current coding block according to mean values of color channels of the reconstructed pixels; determining a second predictor used by a second candidate coding mode of the current coding block according to the mean values of the color channels of the reconstructed pixels, wherein determining the first predictor and determining the second predictor are performed in a parallel manner; determining a coding mode selected from candidate coding modes including at least the first candidate coding mode and the second candidate coding mode; and encoding the current coding block into a part of a bitstream according to at least the determined coding mode.

公开(公告)号：US20170311003A1

公开(公告)日：2017-10-26

申请号：US15490920

申请日：2017-04-19

Applicant: MEDIATEK INC.

Inventor： Tung-Hsing Wu ,  Li-Heng Chen ,  Han-Liang Chou

IPC: H04N19/91 ,  H04N19/124 ,  H04N19/182 ,  H04N19/44

CPC classification number: H04N19/91 ,  H04N19/124 ,  H04N19/182 ,  H04N19/436 ,  H04N19/44

Abstract: An entropy encoding method includes following steps: receiving symbols of a pixel group; entropy encoding data derived from the symbols of the pixel group to generate a first bitstream portion and a second bitstream portion, wherein the first bitstream portion includes encoded magnitude data of the symbols of the pixel group, and the second bitstream portion includes encoded sign data of at least a portion of the symbols of the pixel group; and generating a bitstream segment of the pixel group by combining at least the first bitstream portion and the second bitstream portion. The pixel group includes a plurality of pixels, and the symbols of the pixel group have a plurality of symbol values of the pixels, respectively. When a first symbol value has a zero magnitude value, a sign value of the first symbol value is not entropy encoded into the second bitstream portion.

公开(公告)号：US20170105011A1

公开(公告)日：2017-04-13

申请号：US15210903

申请日：2016-07-15

Applicant: MEDIATEK INC.

Inventor： Li-Heng Chen ,  Tung-Hsing Wu ,  Han-Liang Chou

IPC: H04N19/186 ,  H04N19/70 ,  H04N19/44 ,  H04N19/182

CPC classification number: H04N19/176 ,  H04N19/103 ,  H04N19/136

Abstract: A method and apparatus of coding using multiple coding modes with multiple color spaces are provided. For the encoder side, a coding mode is selected from a coding mode group. A corresponding color domain is associated with the coding mode and the corresponding color domain is selected from a color-domain group including at least two different color domains. The current coding unit is then encoded in the corresponding color domain using the coding mode. Furthermore, the syntax of the corresponding color domain is signaled in current coding unit syntaxes. The different color domains may include RGB color domain and YCoCg color domain. According to another method, if the midpoint prediction (MPP) mode is selected, a current block is color transformed into another color domain and the MPP coding process is performed in said another color domain.