公开(公告)号：US20200068218A1

公开(公告)日：2020-02-27

申请号：US16611611

申请日：2018-05-08

Applicant: MEDIATEK INC.

Inventor： Chun-Chia CHEN ,  Chih-Wei HSU ,  Ching-Yeh CHEN ,  Yu-Wen HUANG ,  Tzu-Der CHUANG

IPC: H04N19/56 ,  H04N19/52 ,  H04N19/82 ,  H04N19/176 ,  H04N19/139 ,  H04N19/105

Abstract: Method and apparatus of Inter prediction for video coding performed by a video encoder or a video decoder that utilizes motion vector prediction (MVP) to code a motion vector (MV) associated with a block coded with Inter mode are disclosed. According to one method, an initial MVP candidate list is generated for the current block. When candidate reordering is selected for the current block, target candidates within a selected candidate set are reordered to generate a reordered MVP candidate list and then the current block is encoded at the video encoder side or decoded at the video decoder sider using the reordered MVP candidate list, where the selected candidate set comprises at least partial candidates of the initial MVP candidate list.

公开(公告)号：US20190342582A1

公开(公告)日：2019-11-07

申请号：US16341189

申请日：2017-10-12

Applicant: MEDIATEK INC.

Inventor： Yu-Chi SU ,  Tzu-Der CHUANG ,  Ching-Yeh CHEN ,  Chih-Wei HSU ,  Yu-Wen HUANG

IPC: H04N19/86 ,  H04N19/82 ,  H04N19/117 ,  H04N19/176 ,  H04N19/159

Abstract: Methods and apparatus for video coding using ringing smoothing filter (RSF) are disclosed. According to one method, ringing smoothing filter (RSF) is applied to the reconstructed residuals to form smoothed reconstructed residuals or applied to an in-loop-filtered reconstructed block to form a smoothed-filtered reconstructed block for the current block, where the RSF corresponds to an edge-preserving filter. The ringing smoothing filter (RSF) may correspond to a bilateral filter. According to another method, adaptive RSF is derived based on information comprising Intra prediction mode or Inter prediction mode. In yet another method, whether to apply ringing smoothing filter (RSF) to a current block in the current image is determined based on one or more control flags. If the control flag(s) indicates the RSF being on for the current block, the RSF is applied to the current block.

公开(公告)号：US20190273923A1

公开(公告)日：2019-09-05

申请号：US16319917

申请日：2017-07-26

Applicant: MEDIATEK INC.

Inventor： Han HUANG ,  Ching-Yeh CHEN ,  Tzu-Der CHUANG ,  Yu-Wen HUANG

IPC: H04N19/124 ,  H04N19/96 ,  H04N19/176 ,  H04N19/174

Abstract: Processing methods and apparatuses for video data comprise receiving input data associated with a current coding block (CB) in a current slice, deriving a top-left location of a current quantization group containing the current CB using a recursive process or a tracking process, and determining a reference quantization parameter (QP) according to the top-left location of the current quantization group. The current CB is encoded or decoded according to the reference QP. The reference QP may be further derived based on a previous QP determined by a tracking method.

公开(公告)号：US20190149824A1

公开(公告)日：2019-05-16

申请号：US16243432

申请日：2019-01-09

Applicant: MEDIATEK INC.

Inventor： Tzu-Der CHUANG ,  Ching-Yeh CHEN ,  Yu-Wen HUANG

IPC: H04N19/13 ,  H04N19/423 ,  H04N19/196 ,  H04N19/91

Abstract: A method and apparatus of entropy coding for a video encoder or decoder using multiple-table based Context-Based Adaptive Binary Arithmetic Coder (CABAC) are disclosed. In one embodiment, a current bin of a binary data of a current coding symbol is encoded or decoded according to a probability of a binary value of the current bin and the probability of the binary value is updated according to the binary value of the current bin for a next bin by using multiple-parameter probability models. Each multiple-parameter probability model is updated using at least one lookup table with the individual set of probability state as a table index to access contents of said at least one lookup table. In another embodiment, the range update is calculated for a range interval based on middle value of the range interval.

公开(公告)号：US20190082191A1

公开(公告)日：2019-03-14

申请号：US16083662

申请日：2017-03-13

Applicant: MEDIATEK INC.

Inventor： Tzu-Der CHUANG ,  Ching-Yeh CHEN ,  Han HUANG ,  Xiaozhong XU ,  Shan LIU

IPC: H04N19/513 ,  H04N19/58 ,  H04N19/119 ,  H04N19/176

Abstract: A method and apparatus for video encoding and decoding with affine motion compensation are disclosed. An embodiment of the method receives input data associated with a current block coded or to be coded in an affine mode. Two or more motion vectors of a neighboring block are retrieved from a buffer, where at least one of the retrieved motion vectors is not corresponding to a sub-block in a first neighboring block row or a first neighboring block column. The method derives an affine candidate including affine motion vectors using the retrieved two or more motion vectors, and encodes or decodes the current block by predicting the current block using one or more motion compensated blocks by the derived affine candidate. The buffer for affine candidate derivation stores selective motion vectors less than all motion vectors of coded blocks in the current picture.

公开(公告)号：US20190075328A1

公开(公告)日：2019-03-07

申请号：US16084778

申请日：2017-03-10

Applicant: MEDIATEK INC.

Inventor： Han HUANG ,  Tzu-Der CHUANG ,  Ching-Yeh CHEN ,  Yu-Wen HUANG

IPC: H04N19/96 ,  H04N19/176 ,  H04N19/70

Abstract: A video data processing method comprises receiving input data associated with a current picture, determining a size for a current coding tree unit (CTU) or a current coding unit (CU) in the current CTU, and if the size, a width, or a height of the current CTU or CU is greater than a threshold, the encoder or decoder splits the current CTU or CU into multiple blocks until each block is not greater than the threshold. The current CTU or CU is processed for prediction or compensation and transform or inverse transform. The current CTU is processed according to CTU-level syntaxes signaled in a video bitstream. The encoder or decoder encodes or decodes the current CTU. The threshold corresponds to a maximum supported transform unit (TU) size for the encoder or decoder.

公开(公告)号：US20180249172A1

公开(公告)日：2018-08-30

申请号：US15754683

申请日：2016-08-31

Applicant: MEDIATEK INC.

Inventor： Ching-Yeh CHEN ,  Tzu-Der CHUANG ,  Yi-Wen CHEN ,  Yu-Chen SUN ,  Yu-Wen HUANG

IPC: H04N19/513 ,  H04N19/182 ,  H04N19/176

CPC classification number: H04N19/513 ,  G06T7/269 ,  H04N19/176 ,  H04N19/182 ,  H04N19/521 ,  H04N19/53 ,  H04N19/54 ,  H04N19/577

Abstract: A method and apparatus of motion compensation using the bi-directional optical flow (BIO) techniques are disclosed. According to one method, the use of BIO is extended to general bi-prediction motion compensation by including the case that two reference pictures correspond to two previously coded pictures. According to another method, the use of BIO is adaptively applied depending on the linearity of the two motion vectors associated with the two reference blocks or depending on block size of the current block. According to yet another method, the refined motion vectors by compensating the original motion vectors with the respective x-offset values and y-offset values are stored in a motion-vector buffer for motion vector prediction of one or more following blocks.

公开(公告)号：US20180199046A1

公开(公告)日：2018-07-12

申请号：US15863547

申请日：2018-01-05

Applicant: MEDIATEK INC.

Inventor： Tzu-Der CHUANG ,  Ching-Yeh CHEN

IPC: H04N19/192 ,  H04N19/13 ,  H04N19/157

CPC classification number: H04N19/192 ,  H03M7/4006 ,  H03M7/4018 ,  H04N19/13 ,  H04N19/157 ,  H04N19/91

Abstract: A method and apparatus of entropy coding of coding symbols using Context-Based Adaptive Binary Arithmetic Coder (CABAC) are disclosed. According to the present invention, CABAC encoding or decoding is applied to a current bin of a binary data of a current coding symbol according to a current probability for a binary value of the current bin and a current range associated with the current state of arithmetic coder. An LPS probability index corresponding to an inverted current probability or the current probability is derived depending on whether the current probability is greater than 0.5. A range index is derived for identifying one range interval containing the current range. An LPS range is then derived using one or more mathematical operations comprising calculating a multiplication of a first value related to the LPS probability index and a second value related to the range index n.

公开(公告)号：US20170339419A1

公开(公告)日：2017-11-23

申请号：US15672401

申请日：2017-08-09

Applicant: MediaTek Inc.

Inventor： Tzu-Der CHUANG ,  Yu-Wen HUANG ,  Ching-Yeh CHEN

IPC: H04N19/176 ,  H04N19/463 ,  H04N19/167 ,  H04N19/159 ,  H04N19/13 ,  H04N19/91 ,  H04N19/102

CPC classification number: H04N19/176 ,  H04N19/102 ,  H04N19/13 ,  H04N19/159 ,  H04N19/167 ,  H04N19/463 ,  H04N19/91

Abstract: A method for encoding luma intra mode using context adaptive entropy processing determines a current luma intra mode for a current block and determines whether a neighboring block of the current block within a region of an independently coded slice is on a different side of a boundary of the region from the current block. The method replaces prediction mode information associated with the neighboring block by DC mode if the neighboring block is on the different side of the boundary of the region from the current block, and forms data for processing a current syntax element associated with the current luma intra mode based on the prediction mode information associated with the neighboring block. In addition, the method performs context adaptive entropy encoding processing on the current syntax element according to the formed data.

公开(公告)号：US20160337649A1

公开(公告)日：2016-11-17

申请号：US15111296

申请日：2015-01-29

Applicant: MEDIATEK INC.

Inventor： Tzu-Der CHUANG ,  Ching-Yeh CHEN

IPC: H04N19/176 ,  H04N19/102 ,  H04N19/46 ,  H04N19/523 ,  H04N19/105 ,  H04N19/159

CPC classification number: H04N19/176 ,  H04N19/102 ,  H04N19/105 ,  H04N19/134 ,  H04N19/159 ,  H04N19/46 ,  H04N19/523

Abstract: A method for adaptive MV precision is disclosed. According to one embodiment, whether to use or not to use the adaptive MV precision for a current block is determined according to a prediction mode/partition type of the current block. If the adaptive MV precision is used, a current MV precision is determined for a current MV of the current block, and the current MV is encoded or decoded at the current MV precision. If the adaptive MV precision is not used, the current MV is encoded or decoded at a finer MV precision. In another embodiment, a value of a current adaptive MV precision flag is selected for a current block to indicate whether to use or not to use the adaptive MV precision for a current block according to a prediction mode/partition type of the current block.

Abstract translation: 公开了一种自适应MV精度的方法。 根据一个实施例，根据当前块的预测模式/分区类型确定是否使用当前块的自适应MV精度。 如果使用自适应MV精度，则针对当前块的当前MV确定当前MV精度，并且以当前MV精度对当前MV进行编码或解码。 如果不使用自适应MV精度，则以更精细的MV精度对当前MV进行编码或解码。 在另一个实施例中，根据当前块的预测模式/分区类型，为当前块选择当前自适应MV精度标志的值，以指示是否使用当前块的自适应MV精度。