公开(公告)号：US09077965B2

公开(公告)日：2015-07-07

申请号：US14049229

申请日：2013-10-09

Applicant: MEDIATEK INC.

Inventor： Tung-Hsing Wu ,  Han-Liang Chou ,  Kun-Bin Lee ,  Chi-Cheng Ju

IPC: G06K9/36 ,  H04N19/194 ,  H04N19/176 ,  H04N19/124 ,  H04N19/127 ,  H04N19/146

CPC classification number: H04N19/194 ,  H04N19/124 ,  H04N19/127 ,  H04N19/146 ,  H04N19/176

Abstract: An image compression method has at least the following steps: receiving source pixel data of a plurality of blocks of a frame; when a lossless compression mode is enabled for the frame, bypassing a source quantization operation and applying a lossless compression kernel to source pixel data of each of the blocks; and when a lossy compression mode is enabled for the frame, applying the source quantization operation to the source pixel data of each of the blocks to generate input pixel data of each of the blocks, and applying the lossless compression kernel to the input pixel data of each of the blocks. For example, the source quantization operation employs an adaptive quantization parameter for each of the blocks such that a size of compressed data of the frame generated under the lossy compression mode does not exceed a bit budget.

Abstract translation: 图像压缩方法至少具有以下步骤：接收帧的多个块的源像素数据; 当对帧进行无损压缩模式时，绕过源量化操作并将无损压缩内核应用于每个块的源像素数据; 并且当为帧启用有损压缩模式时，将源量化操作应用于每个块的源像素数据，以生成每个块的输入像素数据，并将无损压缩内核应用于 每个块。 例如，源量化操作对于每个块采用自适应量化参数，使得在有损压缩模式下生成的帧的压缩数据的大小不超过位预算。

公开(公告)号：US20140133574A1

公开(公告)日：2014-05-15

申请号：US14011002

申请日：2013-08-27

Applicant: MEDIATEK INC.

Inventor： Kun-Bin Lee ,  Ting-An Lin ,  Tung-Hsing Wu

IPC: H04N7/30

CPC classification number: H04N19/48 ,  H04N19/124 ,  H04N19/436 ,  H04N19/467 ,  H04N19/60 ,  H04N19/70

Abstract: A method and apparatus for processing transform coefficients for a video coder or encoder is disclosed in the present invention. Embodiments according to the present invention reduce the storage requirement for sign bit hiding (SBH), improve the parallelism of SBH processing or simplify parity checking. Partial quantized transform coefficients (QTCs) of a transform block may be processed before all QTCs of the transform block are received. Zero and non-zero QTCs of a scan block may be processed concurrently and the QTCs of multiple scan blocks in a transform block may also be processed concurrently when computing cost function for SBH compensation. The range for searching for a value-modification QTC may be less than the scan block to be processed. Parity checking on QTCs may be based on least significant bits (LSBs) of all QTCs or all non-zero QTCs of a scan block.

Abstract translation: 在本发明中公开了一种用于处理视频编码器或编码器的变换系数的方法和装置。 根据本发明的实施例减少了符号位隐藏（SBH）的存储要求，提高了SBH处理的并行性或简化了奇偶校验。 可以在接收到变换块的所有QTC之前处理变换块的部分量化变换系数（QTC）。 可以同时处理扫描块的零和非零QTC，并且当计算用于SBH补偿的成本函数时，变换块中的多个扫描块的QTC也可以同时处理。 用于搜索值修改QTC的范围可能小于要处理的扫描块。 QTC的奇偶校验可以基于所有QTC的最低有效位（LSB）或扫描块的所有非零QTC。

公开(公告)号：US20140092986A1

公开(公告)日：2014-04-03

申请号：US13633182

申请日：2012-10-02

Applicant: MEDIATEK INC.

Inventor： Han-Liang Chou ,  Tung-Hsing Wu ,  Kun-Bin Lee ,  Chi-Cheng Ju

IPC: H04N7/26

CPC classification number: H04N7/50 ,  H04N19/115 ,  H04N19/15 ,  H04N19/17 ,  H04N19/34 ,  H04N19/61

Abstract: A method and apparatus of image data compression and decompression are disclosed. According to an embodiment of the present invention, the compression method partitions the image data into access units and encodes each access unit into a bitstream according to a target bit budget. Each access unit is encoded using first data compression to generate a first bitstream and the residual data is further encoded using second data compression to generate a second bitstream if the first bitstream is smaller than the target bit budget. In one example, the second data compression comprises bit plane coding applied to bit plane-ordered data, wherein the bit plane-ordered data is generated by scanning from a most significant bit to a least significant bit of the residual data in a bit plane-wise order. The decompression method comprises steps to recover reconstructed data from the first and second bitstreams.

Abstract translation: 公开了一种图像数据压缩和解压缩的方法和装置。 根据本发明的实施例，压缩方法将图像数据划分为访问单元，并根据目标比特预算将每个访问单元编码为比特流。 使用第一数据压缩对每个访问单元进行编码以生成第一比特流，并且如果第一比特流小于目标比特预算，则使用第二数据压缩进一步编码残差数据以生成第二比特流。 在一个示例中，第二数据压缩包括应用于位平面有序数据的位平面编码，其中通过在位平面有序数据中从残留数据的最高有效位扫描到最低有效位来生成位平面有序数据， 明智的秩序。 解压缩方法包括从第一和第二比特流恢复重建数据的步骤。

公开(公告)号：US20230217027A1

公开(公告)日：2023-07-06

申请号：US17892139

申请日：2022-08-22

Applicant: MEDIATEK INC.

Inventor： Tung-Hsing Wu ,  Ping-Han Lee ,  Tzu-Yun Tseng

IPC: H04N19/14 ,  H04N19/182 ,  H04N19/172

CPC classification number: H04N19/14 ,  H04N19/182 ,  H04N19/172

Abstract: A video encoding apparatus includes a content activity analyzer circuit and a video encoder circuit. The content activity analyzer circuit applies a content activity analysis process to consecutive frames, to generate content activity analysis results. The consecutive frames are derived from input frames of the video encoding apparatus. The content activity analysis process includes: deriving a first content activity analysis result according to a first frame and a second frame in the consecutive frames, wherein the first content activity analysis result includes a processed frame distinct from the second frame; and deriving a second content activity analysis result according to a third frame included in the consecutive frames and the processed frame. The video encoder circuit performs a video encoding process to generate a bitstream output of the video encoding apparatus, wherein information derived from the content activity analysis results is referenced by the video encoding process.

公开(公告)号：US20220360775A1

公开(公告)日：2022-11-10

申请号：US17725574

申请日：2022-04-21

Applicant: MEDIATEK INC.

Inventor： Tung-Hsing Wu ,  Shih-Yu Chen ,  Jer-Ming Chang ,  Chih-Hao Chang ,  Han-Liang Chou

IPC: H04N19/117 ,  H04N19/80 ,  H04N19/182 ,  H04N19/176

Abstract: A video encoding method includes: during a first period, performing an encoding process upon a first block group of a current frame to generate a first block group bitstream; and during a second period, transmitting a second block group bitstream derived from encoding a second block group of the current frame, wherein the second period overlaps the first period. The encoding process includes: during a first time segment of the first period, performing a first in-loop filtering process upon a first group of pixels; and during a second time segment of the first period, performing a second in-loop filtering process upon a second group of pixels, wherein the second time segment overlaps the first time segment, and a non-zero pixel distance exists between a first edge pixel of the first group of pixels and a second edge pixel of the second group of pixels in a filter direction.

公开(公告)号：US11166029B2

公开(公告)日：2021-11-02

申请号：US17190409

申请日：2021-03-03

Applicant: MEDIATEK INC.

Inventor： Li-Heng Chen ,  Tung-Hsing Wu ,  Yi-Hsin Huang ,  Lien-Fei Chen ,  Ting-An Lin ,  Han-Liang Chou

IPC: H04N19/15 ,  H04N19/105 ,  H04N19/184 ,  H04N19/463 ,  H04N19/172 ,  H04N19/159

Abstract: A video encoding apparatus includes a data buffer and a video encoding circuit. Encoding of a first frame includes: deriving reference pixels of a reference frame from reconstructed pixels of the first frame, respectively, and storing reference pixel data into the data buffer for inter prediction, wherein the reference pixel data include information of pixel values of the reference pixels. Encoding of a second frame includes performing prediction upon a coding unit in the second frame to determine a target predictor for the coding unit. The prediction performed upon the coding unit includes: determining the target predictor for the coding unit according to whether a search range on the reference frame for finding a predictor of the coding unit under an inter prediction mode includes at least one reference pixel of the reference frame that is not accessible to the video encoding circuit.

公开(公告)号：US10972738B2

公开(公告)日：2021-04-06

申请号：US16367237

申请日：2019-03-27

Applicant: MEDIATEK INC.

Inventor： Li-Heng Chen ,  Tung-Hsing Wu ,  Yi-Hsin Huang ,  Lien-Fei Chen ,  Ting-An Lin ,  Han-Liang Chou

IPC: H04N19/159 ,  H04N19/15 ,  H04N19/105 ,  H04N19/172 ,  H04N19/184 ,  H04N19/463

Abstract: A video encoding apparatus includes a data buffer and a video encoding circuit. Encoding of a first frame includes: deriving reference pixels of a reference frame from reconstructed pixels of the first frame, respectively, and storing reference pixel data into the data buffer for inter prediction, wherein the reference pixel data include information of pixel values of the reference pixels. Encoding of a second frame includes performing prediction upon a coding unit in the second frame to determine a target predictor for the coding unit. The prediction performed upon the coding unit includes: checking if a search range on the reference frame for finding a predictor of the coding unit under an inter prediction mode includes at least one reference pixel of the reference frame that is not accessible to the video encoding circuit, and determining the target predictor for the coding unit according to a checking result.

公开(公告)号：US10715813B2

公开(公告)日：2020-07-14

申请号：US14534184

申请日：2014-11-06

Applicant: MEDIATEK INC.

Inventor： Tung-Hsing Wu ,  Kun-Bin Lee

IPC: H04N19/14 ,  H04N19/15 ,  H04N19/105 ,  H04N19/159 ,  H04N19/593 ,  H04N19/423 ,  H04N19/176 ,  H04N19/50

Abstract: A block prediction search method includes at least following steps: utilizing a data buffer to store bit-depth reduced sample values of a plurality of samples in a first pixel line; detecting occurrence of an edge in the first pixel line according to restored sample values derived from stored sample values in the data buffer; and determining a block prediction vector for a pixel group in a second pixel line different from the first pixel line, wherein the block prediction vector is determined based at least partly on a last edge count value indicative of a number of samples in the first pixel line that have gone by since the edge occurs.

公开(公告)号：US20190306510A1

公开(公告)日：2019-10-03

申请号：US16367237

申请日：2019-03-27

Applicant: MEDIATEK INC.

Inventor： Li-Heng Chen ,  Tung-Hsing Wu ,  Yi-Hsin Huang ,  Lien-Fei Chen ,  Ting-An Lin ,  Han-Liang Chou

IPC: H04N19/15 ,  H04N19/105 ,  H04N19/463 ,  H04N19/159 ,  H04N19/184 ,  H04N19/172

Abstract: A video encoding apparatus includes a data buffer and a video encoding circuit. Encoding of a first frame includes: deriving reference pixels of a reference frame from reconstructed pixels of the first frame, respectively, and storing reference pixel data into the data buffer for inter prediction, wherein the reference pixel data include information of pixel values of the reference pixels. Encoding of a second frame includes performing prediction upon a coding unit in the second frame to determine a target predictor for the coding unit. The prediction performed upon the coding unit includes: checking if a search range on the reference frame for finding a predictor of the coding unit under an inter prediction mode includes at least one reference pixel of the reference frame that is not accessible to the video encoding circuit, and determining the target predictor for the coding unit according to a checking result.

公开(公告)号：US10412390B2

公开(公告)日：2019-09-10

申请号：US15641224

申请日：2017-07-04

Applicant: MEDIATEK INC.

Inventor： Ming-Long Wu ,  Tung-Hsing Wu ,  Li-Heng Chen ,  Ting-An Lin ,  Yi-Hsin Huang ,  Chung-Hua Tsai ,  Chia-Yun Cheng ,  Han-Liang Chou ,  Yung-Chang Chang

IPC: H04N19/13 ,  H04N19/70 ,  H04N19/44 ,  H04N21/23 ,  H04N21/84 ,  H04N19/124 ,  H04N19/172 ,  H04N19/18 ,  H04N19/174 ,  H04N21/2365 ,  H04N21/2665 ,  H04N21/2343 ,  H04N21/845

Abstract: A video encoder has a processing circuit and a universal binary entropy (UBE) syntax encoder. The processing circuit processes pixel data of a video frame to generate encoding-related data, wherein the encoding-related data comprise at least quantized transform coefficients. The UBE syntax encoder processes a plurality of syntax elements to generate UBE syntax data. The encoding-related data are represented by the syntax elements. The processing circuit operates according to a video coding standard. The video coding standard supports arithmetic encoding. The UBE syntax data contain no arithmetic-encoded syntax data.