公开(公告)号：US20180205960A1

公开(公告)日：2018-07-19

申请号：US15919008

申请日：2018-03-12

Applicant: MediaTek Inc.

Inventor： Tzu-Der Chuang ,  Zhenzhong Chen ,  Shan Liu ,  Ching-Yeh Chen ,  Chih-Wei Hsu

IPC: H04N19/30 ,  H04N19/61 ,  H04N19/52 ,  H04N19/50 ,  H04N19/105 ,  H04N19/176 ,  H04N19/134 ,  H04N19/12 ,  H04N19/187

CPC classification number: H04N19/30 ,  H04N19/105 ,  H04N19/12 ,  H04N19/134 ,  H04N19/176 ,  H04N19/187 ,  H04N19/50 ,  H04N19/52 ,  H04N19/61

Abstract: Methods of adaptive transform type based on transform unit (TU) size for enhancement layer (EL) coding and multiple motion candidates for EL coding based on corresponding base layer (BL) video data are provided. One method selects a transform type from multiple allowable transform types based on the TU size and applies the selected transform type to the transform units of the inter-layer prediction processed data. Another method derives multiple motion candidates for the EL video data coded in Merge mode or Inter mode based on motion information associated with the corresponding BL video data.

公开(公告)号：US20150281708A1

公开(公告)日：2015-10-01

申请号：US14378965

申请日：2013-03-19

Applicant: MEDIATEK INC.

Inventor： Tzu-Der Chuang ,  Ching-Yeh Chen ,  Yu-Wen Huang ,  Jian-Liang Lin ,  Yi-Wen Chen ,  Shih-Ta Hsiang ,  Shan Liu ,  Shaw-Min Lei

IPC: H04N19/33 ,  H04N19/577 ,  H04N19/52

CPC classification number: H04N19/33 ,  H04N19/52 ,  H04N19/577 ,  H04N19/96

Abstract: A method and apparatus for coding video data using Inter prediction mode or Merge mode in a video coding system are disclosed, where the video data is configured into a Base Layer (BL) and an Enhancement Layer (EL), and the EL has higher spatial resolution or better video quality than the BL. In one embodiment, at least one information piece of motion information associated with one or more BL blocks in the BL is identified. A motion vector prediction (MVP) candidate list or a Merge candidate list for the selected block in the EL is then determined, where said at least one information piece associated with said one or more BL blocks in the BL is included in the MVP-candidate list or a Merge candidate MVP candidate list or the Merge candidate list. The input data associated with the selected block is coded or decoded using the MVP candidate list or the Merge candidate list.

Abstract translation: 公开了一种在视频编码系统中使用帧间预测模式或合并模式对视频数据进行编码的方法和装置，其中将视频数据配置为基本层（BL）和增强层（EL），并且EL具有较高的空间 分辨率或更好的视频质量比BL。 在一个实施例中，识别与BL中的一个或多个BL块相关联的运动信息的至少一个信息片段。 然后确定EL中所选块的运动矢量预测（MVP）候选列表或合并候选列表，其中与BL中的所述一个或多个BL块相关联的所述至少一个信息片段被包括在MVP候选中 列表或合并候选MVP候选列表或合并候选列表。 与所选择的块相关联的输入数据使用MVP候选列表或合并候选列表进行编码或解码。

公开(公告)号：US20150222912A1

公开(公告)日：2015-08-06

申请号：US14422051

申请日：2013-07-30

Applicant: MediaTek Inc.

Inventor： Tzu-Der Chuang ,  Zhenzhong Chen ,  Shan Liu ,  Ching-Yeh Chen ,  Chih-Wei Hsu

IPC: H04N19/187 ,  H04N19/70 ,  H04N19/50 ,  H04N19/176 ,  H04N19/31

CPC classification number: H04N19/187 ,  H04N19/176 ,  H04N19/31 ,  H04N19/33 ,  H04N19/36 ,  H04N19/463 ,  H04N19/50 ,  H04N19/70

Abstract: A method and apparatus for coding video data in a scalable or three-dimensional video coding system are disclosed. In one embodiment, context for the input data associated with an inter-layer or inter-view coding syntax element of a current block in an enhancement-layer (EL) or a dependent view is formed or the input data is parsed to identify the context based on information associated with one or more neighboring blocks, information associated with the current block, or both. In another embodiment, encoding or decoding is applied to the input data associated with the current block in the EL using inter-layer texture prediction based on the BL block in the BL, wherein a flag indicating whether there is any transform coefficient coded for the current block is signaled.

Abstract translation: 公开了一种用于对可缩放或三维视频编码系统中的视频数据进行编码的方法和装置。 在一个实施例中，形成与增强层（EL）或从属视图中的当前块的层间或视图间编码语法元素相关联的输入数据的上下文，或者解析输入数据以识别上下文 基于与一个或多个相邻块相关联的信息，与当前块相关联的信息，或两者。 在另一个实施例中，使用基于BL中的BL块的层间纹理预测将编码或解码应用于与EL中的当前块相关联的输入数据，其中指示是否存在针对当前的编码的任何变换系数的标志 信号通知。

公开(公告)号：US20150139325A1

公开(公告)日：2015-05-21

申请号：US14406529

申请日：2013-06-13

Applicant: MEDIATEK INC.

Inventor： Tzu-Der Chuang ,  Yu-Wen Huang ,  Ching-Yeh Chen ,  Chia-Yang Tsai ,  Chih-Ming Fu ,  Shih-Ta Hsiang

IPC: H04N19/30 ,  H04N19/52 ,  H04N19/50

CPC classification number: H04N19/30 ,  H04N19/31 ,  H04N19/33 ,  H04N19/36 ,  H04N19/50 ,  H04N19/51 ,  H04N19/52 ,  H04N19/587 ,  H04N19/59 ,  H04N19/593

Abstract: A method and apparatus for inter-layer prediction for scalable video coding are disclosed. Embodiments of the present invention utilize weighted prediction for scalable coding. The weighted prediction is based on the predicted texture data and the inter-layer Intra prediction data derived from BL reconstructed data. The inter-layer Intra prediction data corresponds to the BL reconstructed data or up-sampled BL reconstructed data. The predicted texture data corresponds to spatial Intra prediction data or motion-compensated prediction data based on the second EL video data in the same layer as the current EL picture. Embodiments of the present invention also utilize the reference picture list including an inter-layer reference picture (ILRP) corresponding to BL reconstructed texture frame or up-sampled BL reconstructed texture frame for Inter prediction of EL video data. The motion vector is limited to a range around (0,0) when the ILRP is selected as a reference picture.

Abstract translation: 公开了一种用于可分级视频编码的层间预测的方法和装置。 本发明的实施例利用可扩展编码的加权预测。 加权预测基于从BL重建数据导出的预测纹理数据和层间Intra预测数据。 层内帧内预测数据对应于BL重构数据或上采样BL重构数据。 预测纹理数据对应于基于与当前EL图像相同的层中的第二EL视频数据的空间帧内预测数据或运动补偿预测数据。 本发明的实施例还使用包括对应于BL重构纹理帧或上采样BL重建纹理帧的层间参考图片（ILRP）的参考图片列表，用于EL视频数据的帧间预测。 当选择ILRP作为参考图像时，运动矢量被限制在大约（0,0）的范围内。

公开(公告)号：US20150010055A1

公开(公告)日：2015-01-08

申请号：US14371404

申请日：2012-11-16

Applicant: MEDIATEK INC.

Inventor： Chih-Wei Hsu ,  Tzu-Der Chuang ,  Yu-Wen Huang

IPC: H04N19/13 ,  H04N19/196 ,  H04N19/18

CPC classification number: H04N19/196 ,  H04N19/13 ,  H04N19/18 ,  H04N19/463 ,  H04N19/91

Abstract: A method and apparatus for significance map coding for 4×4 TUs (transform units) and 8×8 TUs of video data are disclosed. The method comprises receiving at least one context selection table for a first TU associated with a first color component and generating a derived context selection table for a second TU associated with a second color component from said at least one context selection table. The first TU has a first size comprising of 4×4 and 8×8. The second TU has a second size comprising of 4×4 and 8×8. The second size is different from the first size, the second color component is different from the first color component, or both the second size is different from the first size and the second color component is different from the first color component. The derived context selection table is then used for significance map processing of the second TU.

Abstract translation: 公开了一种用于4×4TU（变换单元）和8×8TU视频数据的重要地图编码的方法和装置。 所述方法包括：接收与第一颜色分量相关联的第一TU的至少一个上下文选择表，并且从所述至少一个上下文选择表生成与第二颜色分量相关联的第二TU的导出上下文选择表。 第一TU具有包括4×4和8×8的第一尺寸。 第二TU具有包括4×4和8×8的第二尺寸。 第二尺寸与第一尺寸不同，第二颜色分量不同于第一颜色分量，或者第二尺寸不同于第一尺寸，并且第二颜色分量与第一颜色分量不同。 然后将导出的上下文选择表用于第二TU的显着性映射处理。

公开(公告)号：US20140247884A1

公开(公告)日：2014-09-04

申请号：US14353025

申请日：2012-11-07

Applicant: MEDIATEK INC.

Inventor： Tzu-Der Chuang ,  Jian-Liang Lin ,  Ching-Yeh Chen ,  Yi-Wen Chen ,  Yu-Wen Huang

IPC: H04N19/51 ,  H04N19/583 ,  H04N19/30

CPC classification number: H04N19/52 ,  H04N19/105 ,  H04N19/172 ,  H04N19/176 ,  H04N19/42 ,  H04N19/513 ,  H04N19/567 ,  H04N19/58 ,  H04N19/91

Abstract: A method and apparatus for deriving a scaled MV (motion vector) for a current block based on a candidate MV associated with a candidate block are disclosed. Embodiments according to the present invention increase effective scaling factor of motion vector scaling. In one embodiment, a distance ratio of a first picture distance between a current picture and a target reference picture pointed to by a current motion vector of the current block to a second picture distance between a candidate picture corresponding to the candidate block and a candidate reference picture pointed to by the candidate MV is computed. The scaled MV is then generated based on the candidate MV according to the distance ratio, where the scaled MV has an effective scaling ratio between −m and n, and wherein m and n are positive integers greater than 4. The values of m and n can be 8, 16 or 32.

Abstract translation: 公开了一种用于基于与候选块相关联的候选MV导出当前块的缩放MV（运动矢量）的方法和装置。 根据本发明的实施例增加了运动矢量缩放的有效缩放因子。 在一个实施例中，由当前块的当前运动矢量指向的当前画面和目标参考画面之间的第一画面距离与候选块对应的候选画面与候选画面之间的第二画面距离的距离比 计算由候选MV指向的图片。 然后根据距离比，基于候选MV生成缩放的MV，其中缩放的MV具有-m和n之间的有效缩放比率，并且其中m和n是大于4的正整数。m和n的值 可以是8,16或32。

公开(公告)号：US12120293B2

公开(公告)日：2024-10-15

申请号：US17977466

申请日：2022-10-31

Applicant: MediaTek Inc.

Inventor： Cheng-Yen Chuang ,  Man-Shu Chiang ,  Chun-Chia Chen ,  Chih-Wei Hsu ,  Tzu-Der Chuang ,  Ching-Yeh Chen ,  Yu-Wen Huang

IPC: H04N19/105 ,  H04N19/117 ,  H04N19/176 ,  H04N19/423 ,  H04N19/52

CPC classification number: H04N19/105 ,  H04N19/117 ,  H04N19/176 ,  H04N19/423 ,  H04N19/52

Abstract: A video coding system generating candidates for Merge Mode with Motion Vector Difference (MMVD) with reduced resource usage is provided. The system receives data to be encoded or decoded as a current block of a current picture of a video. The system identifies multiple MMVD candidates for different offset positions based on a merge candidate of the current block. The system generates reference samples for the identified MMVD candidates. The system reconstructs the current block or encodes the current block into a bitstream by using the generated reference samples. The system processes the MMVD candidates in separate groups: a first group of vertical MMVD candidates and a second group of horizontal MMVD candidates. The system generates the reference samples for the identified MMVD candidates by applying a vertical filter to source reference samples of horizontal MMVD candidates and then applying a horizontal filter to outputs of the vertical filter.

公开(公告)号：US11985330B2

公开(公告)日：2024-05-14

申请号：US17601964

申请日：2020-04-10

Applicant: MEDIATEK INC.

Inventor： Chen-Yen Lai ,  Tzu-Der Chuang ,  Ching-Yeh Chen

IPC: H04N19/00 ,  H04N19/105 ,  H04N19/109 ,  H04N19/12 ,  H04N19/139 ,  H04N19/159 ,  H04N19/167 ,  H04N19/172 ,  H04N19/176 ,  H04N19/182 ,  H04N19/61

CPC classification number: H04N19/159 ,  H04N19/105 ,  H04N19/109 ,  H04N19/12 ,  H04N19/139 ,  H04N19/167 ,  H04N19/172 ,  H04N19/176 ,  H04N19/182 ,  H04N19/61

Abstract: Methods and apparatus of for video coding using sub-block based affine mode are disclosed. In one method, if affine fallback is used or the control-point motion vectors are the same, the sub-block based affine mode is disabled in order to reduce computational complexity. According to another method for video coding using a coding tool belonging to a coding tool group comprising Prediction Refinement with Optical Flow (PROF) and Bi-Directional Optical Flow (BDOF), predictor refinement is derived for pixels of a target subblock of the current block, where a step to derive the predictor refinement comprises to derive gradients for the pixels of the target subblock of the current block and to right-shift the first gradients by a common shift.

公开(公告)号：US11856227B2

公开(公告)日：2023-12-26

申请号：US17825269

申请日：2022-05-26

Applicant: MEDIATEK INC.

Inventor： Chih-Hsuan Lo ,  Man-Shu Chiang ,  Chun-Chia Chen ,  Chih-Wei Hsu ,  Tzu-Der Chuang ,  Ching-Yeh Chen ,  Yu-Wen Huang

IPC: H04N19/625 ,  H04N19/124 ,  H04N19/122 ,  H04N19/18 ,  H04N19/176 ,  H04N19/423

CPC classification number: H04N19/625 ,  H04N19/122 ,  H04N19/124 ,  H04N19/176 ,  H04N19/18 ,  H04N19/423

Abstract: Video encoding methods and apparatuses in a video encoding system receive an input residual signal of a current block by a shared transform circuit, apply horizontal transform and vertical transform by a shared transform circuit to generate transform coefficients, apply quantization and inverse quantization to generate recovered transform coefficients, apply inverse vertical transform and inverse horizontal transform to the recovered transform coefficients by the shared transform circuit to generate a reconstructed residual signal for the current block, and encode the current block based on quantized levels of the current block. The shared transform circuit and a coefficient buffer in the folded 4-time transform architecture reuse computation resources in each transform stage. In some embodiments of the folded 4-time transform architecture, a hierarchical design for block size grouping is implemented with fixed throughput for uniform hardware scheduling.

公开(公告)号：US20230199171A1

公开(公告)日：2023-06-22

申请号：US17994400

申请日：2022-11-28

Applicant: MediaTek Inc.

Inventor： Yu-Ling Hsiao ,  Chun-Chia Chen ,  Chih-Wei Hsu ,  Tzu-Der Chuang ,  Ching-Yeh Chen ,  Yu-Wen Huang

IPC: H04N19/105 ,  H04N19/137 ,  H04N19/176 ,  H04N19/172

CPC classification number: H04N19/105 ,  H04N19/137 ,  H04N19/176 ,  H04N19/172

Abstract: Various schemes for managing search memory are described, which are beneficial in achieving enhanced coding gain, low latency, and/or reduced hardware for a video encoder or decoder. In processing a current block of a current picture, an apparatus determines a quantity of a plurality of reference pictures of the current picture. The apparatus subsequently determines, for at least one of the reference pictures, a corresponding search range size based on the quantity. The apparatus then determines, based on the search range size and a location of the current block, a search range of the reference picture, based on which the apparatus encodes or decodes the current block.