公开(公告)号：US20200374545A1

公开(公告)日：2020-11-26

申请号：US16968295

申请日：2019-02-11

Applicant: MEDIATEK INC.

Inventor： Chen-Yen LAI ,  Zhi-Yi LIN ,  Ching-Yeh CHEN ,  Tzu-Der CHUANG

IPC: H04N19/52 ,  H04N19/70 ,  H04N19/176

Abstract: Methods and apparatus for a video coding system with the current picture referencing (CPR) mode enabled are disclosed. According to one method, when the current reference picture is equal to the current picture, an integer motion vector flag is inferred to be true without signalling the integer or parsing the motion vector flag. In another method, when all motion vector differences for the current block are equal to zero, an integer motion vector flag is inferred to be true without signalling the integer or parsing the motion vector flag. In yet another method, when all reference pictures for the current block are equal to the current picture: the sub-block prediction coding mode is disabled; and the current block is encoded or decoded by disabling the sub-block prediction coding mode. Alternatively, derived motion vectors associated with sub-blocks for the current block can be converted into integer motion vectors.

公开(公告)号：US20200322602A1

公开(公告)日：2020-10-08

申请号：US16304203

申请日：2017-05-27

Applicant: MEDIATEK INC.

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

IPC: H04N19/119 ,  H04N19/46 ,  H04N19/96 ,  H04N19/186 ,  H04N19/176 ,  H04N19/174

Abstract: Processing methods and apparatuses for video data of a color component comprise receiving input data associated with a current coding block (CB) in a current slice, where the video data is partitioned into multiple CBs according to a partitioning method. A Quantization Parameter (QP) minimum block area or a depth flag is determined and an area of the current CB according to a width and a height or a combined depth of the current CB is calculated and compared with the QP minimum block area or the depth flag. Signaling of QP information for the current CB is conditioned by the comparing result. The QP information for the current CB is used to quantize a residual signal of the current CB or recovering a quantized residual signal of the current CB.

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.