公开(公告)号：US20180152714A1

公开(公告)日：2018-05-31

申请号：US15578221

申请日：2016-06-03

Applicant: MEDIATEK INC.

Inventor： Yu-Chen SUN ,  Tzu-Der CHUANG ,  Han-Liang CHOU ,  Chia-Yun Cheng ,  Ching-Yeh CHEN ,  Yu-Wen Huang

IPC: H04N19/186 ,  H04N19/176 ,  H04N19/70

CPC classification number: H04N19/186 ,  H04N19/176 ,  H04N19/423 ,  H04N19/433 ,  H04N19/51 ,  H04N19/593 ,  H04N19/70

Abstract: Methods of palette coding to reduce the required coding process are disclosed. According to one method, smaller blocks are derived from a large block. The histogram of the large block is derived based on the histograms of smaller blocks in the large block. According to another method, one or more palette tables are derived based on multiple blocks. One palette table is used for each of the multiple blocks. According to yet another method, index map transpose is performed in the parsing stage according to the transpose flag of the index map. Accordingly, a buffer to store the transpose flags can be saved. According to still yet another method, the palette predictor update is performed using an index mapping table to avoid the need for shuffling the contents of the palette predictor stored in a palette buffer.

公开(公告)号：US20170310987A1

公开(公告)日：2017-10-26

申请号：US15485283

申请日：2017-04-12

Applicant: MEDIATEK INC.

Inventor： Tung-Hsing WU ,  Li-Heng CHEN ,  Han-Liang CHOU

IPC: H04N19/513 ,  H04N19/122 ,  H04N19/124 ,  H04N19/176 ,  H04N19/182 ,  H04N19/184 ,  H04N19/174

CPC classification number: H04N19/176 ,  H04N19/105 ,  H04N19/124 ,  H04N19/147 ,  H04N19/51 ,  H04N19/593

Abstract: A method and apparatus of image coding performed at an encoder or decoder using block prediction are disclosed. The block vector bit-count information associated with one or more block vectors (BVs) for the current block is determined, where the BVs are used to locate one or more block predictors for the current block. Prediction residuals corresponding to differences between the current block and the block predictors are determined. A first cost comprising the BV and residual bit-count information associated with encoding the prediction residuals using the first coding tool is determined. The second cost comprising the BV bit-count information and without the residual bit-count information is also determined. The derivation of the BV bit-count information and the prediction residuals for the current block are performed only once, and the BV bit-count information and the prediction residuals are used by the first coding tool and the second coding tool.

公开(公告)号：US20170188026A1

公开(公告)日：2017-06-29

申请号：US15386022

申请日：2016-12-21

Applicant: MEDIATEK INC.

Inventor： Tung-Hsing WU ,  Li-Heng CHEN ,  Han-Liang CHOU

IPC: H04N19/112 ,  H04N19/136 ,  H04N19/44 ,  H04N19/13 ,  H04N19/184

CPC classification number: H04N19/112 ,  H04N19/13 ,  H04N19/136 ,  H04N19/184 ,  H04N19/44 ,  H04N19/593

Abstract: A method and apparatus of image coding including adaptive entropy coding are disclosed. According to this method, input pixels associated with a group of symbols generated from image or video data are received. Maximum bit-depth of the group of symbols is then determined. If the maximum bit-depth of the group of symbols is smaller than a first bit-depth threshold, the group of symbols is encoded or decoded using Golomb-Rice coding. If the maximum bit-depth of the group of symbols is greater than or equal to the first bit-depth threshold, the group of symbols is encoded or decoded using second entropy coding, where the second entropy coding is different from the Golomb-Rice coding. Outputs corresponding to encoded or decoded output associated with the group of symbols are provided. The maximum bit-depth of the group of symbols is signaled at the encoder or recovered at the decoder by parsing the bitstream.

公开(公告)号：US20170134734A1

公开(公告)日：2017-05-11

申请号：US15331059

申请日：2016-10-21

Applicant: MEDIATEK INC.

Inventor： Tung-Hsing WU ,  Li-Heng CHEN ,  Han-Liang CHOU

IPC: H04N19/176

CPC classification number: H04N19/176 ,  H04N19/119 ,  H04N19/154 ,  H04N19/182 ,  H04N19/186 ,  H04N19/91

Abstract: Method and apparatus of image coding using block prediction (BP) allowing multiple block sizes are disclosed. According to one method, first distortion for the current block coded using BP with a first block size is derived using at least partial second distortion for the current block coded using BP with a first block size. According to another method, a flag indicating whether the BP using variable block sizes is enabled. According to yet another method, when a current block is coded using BP by partitioning the current block into multiple partitions, predictors for two partitions in different reconstructed pixel line groups are derived from different reconstructed pixel line groups. According to still yet another method, for coding image data in a non-444 color sampling format using BP, the predictors for chrominance pixels in the current block are derived from the predictors for the luminance pixels of the current block.

公开(公告)号：US20170006294A1

公开(公告)日：2017-01-05

申请号：US15265896

申请日：2016-09-15

Applicant: MediaTek Inc.

Inventor： Chao-Chih HUANG ,  Ting-An LIN ,  Shen-Kai CHANG ,  Han-Liang CHOU

IPC: H04N19/159 ,  H04N19/124 ,  H04N19/15 ,  H04N19/139 ,  H04N19/51 ,  H04N19/42 ,  H04N19/13 ,  H04N19/61 ,  H04N19/105

CPC classification number: H04N19/439 ,  H04N19/42 ,  H04N19/423 ,  H04N19/43 ,  H04N19/433

Abstract: A hybrid video encoding method and system using a software engine and a hardware engine. The software engine receives coding unit data associated with a current picture, and performs a first part of the video encoding operation by executing instructions. The first part of the video encoding operation generates an inter predictor and control information corresponding to the coding unit data of the current picture. The first part of the video encoding operation stores the inter predictor into an off-chip memory. The hardware engine performs a second part of the video encoding operation according to the control information. The second part of the video encoding operation receives the inter predictor, and subtracts the inter predictor from the coding unit data to generate a residual signal. The second part of the video encoding operation then transforms and quantizes the residual signal to generate transformed and quantized residual signal, and encodes the transformed and quantized residual signal to generate an encoded video bitstream.

Abstract translation: 一种使用软件引擎和硬件引擎的混合视频编码方法和系统。 软件引擎接收与当前图像相关联的编码单元数据，并且通过执行指令来执行视频编码操作的第一部分。 视频编码操作的第一部分产生与当前图像的编码单元数据相对应的帧间预测器和控制信息。 视频编码操作的第一部分将帧间预测器存储在片外存储器中。 硬件引擎根据控制信息执行视频编码操作的第二部分。 视频编码操作的第二部分接收帧间预测器，并从编码单元数据中减去帧间预测器，以生成残留信号。 视频编码操作的第二部分然后对剩余信号进行变换和量化以产生经变换和量化的残差信号，并且对经变换和量化的残差信号进行编码以产生经编码的视频比特流。

公开(公告)号：US20160227238A1

公开(公告)日：2016-08-04

申请号：US15000190

申请日：2016-01-19

Applicant: MediaTek Inc.

Inventor： Tung-Hsing WU ,  Han-Liang CHOU

IPC: H04N19/436 ,  H04N19/56 ,  H04N19/52

CPC classification number: H04N19/436 ,  H04N19/433 ,  H04N19/52 ,  H04N19/56 ,  H04N19/593

Abstract: Method and apparatus of video coding using coding modes including Intra Block Copy (IntraBC) for a video coding system incorporating multi-stage pipeline processing is disclosed. In order to overcome data dependency issue due to the use of pipeline architecture, a first embodiment uses constrained previous reconstructed region for IntraBC estimation by excluding unavailable reconstructed previous reconstructed data due to the multi-stage pipeline processing. In the second embodiment, the unavailable reconstructed data is replaced by source pixel data.

Abstract translation: 公开了使用包括用于包含多级流水线处理的视频编码系统的帧内复制（IntraBC）的编码模式的视频编码的方法和装置。 为了克服由于使用流水线架构而导致的数据依赖性问题，第一实施例使用受限的先前重构区域进行IntraBC估计，由于多级流水线处理而排除不可用的重建先前重构数据。 在第二实施例中，不可用的重建数据被源像素数据代替。