公开(公告)号：US10575000B2

公开(公告)日：2020-02-25

申请号：US15485283

申请日：2017-04-12

Applicant: MEDIATEK INC.

Inventor： Tung-Hsing Wu ,  Li-Heng Chen ,  Han-Liang Chou

IPC: H04N19/176 ,  H04N19/124 ,  H04N19/105 ,  H04N19/593 ,  H04N19/147 ,  H04N19/51

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：US10200694B2

公开(公告)日：2019-02-05

申请号：US15229506

申请日：2016-08-05

Applicant: MediaTek Inc.

Inventor： Tung-Hsing Wu ,  Li-Heng Chen ,  Han-Liang Chou

IPC: H04N19/164 ,  H04N19/172 ,  H04L1/00 ,  H04L12/26 ,  H04N19/159 ,  H04N19/107 ,  H04N19/15 ,  H04N19/114 ,  H04N19/65 ,  H04N19/89

Abstract: A method and apparatus of encoding frames with a frame type structure adaptively according to a current encoding status after receiving a request for an IDR frame or receiving an indication of picture data loss are disclosed. If the check result of the current encoding status is true, the second frame type structure is the same as the first frame type structure; and if the check result of the current encoding status is false, the second frame type structure is different from the first frame type structure. Another method and apparatus of encoding frames with a reference frame structure and a frame type structure adaptively according to one or more current encoding statuses after receiving an indication of picture data loss are disclosed. The system may use two different check results to adaptively select the reference frame structure and the frame type structure.

公开(公告)号：US10165292B2

公开(公告)日：2018-12-25

申请号：US15000190

申请日：2016-01-19

Applicant: MediaTek Inc.

Inventor： Tung-Hsing Wu ,  Han-Liang Chou

IPC: H04B1/66 ,  H04N19/436 ,  H04N19/52 ,  H04N19/56 ,  H04N19/593 ,  H04N19/433

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.

公开(公告)号：US20180324439A1

公开(公告)日：2018-11-08

申请号：US15973503

申请日：2018-05-07

Applicant: MEDIATEK INC.

Inventor： Tung-Hsing Wu ,  Kuan-Hung Chou ,  Han-Liang Chou ,  Chien-Chang Wang

IPC: H04N19/146 ,  H04N19/126 ,  H04N19/132

CPC classification number: H04N19/146 ,  H04N19/126 ,  H04N19/132

Abstract: An adaptive video encoding method includes: encoding, by an encoding circuit, a current frame to generate a current encoded frame; and after the current frame is encoded, obtaining quantization parameter information of at least one encoded frame, wherein the at least one encoded frame includes the current encoded frame, and referring to the quantization parameter information to adaptively adjust a frame rate of at least one next frame to be actually encoded by the encoding circuit.

公开(公告)号：US20180152727A1

公开(公告)日：2018-05-31

申请号：US15578191

申请日：2016-06-03

Applicant: MEDIATEK INC.

Inventor： Tzu-Der CHUANG ,  Chia-Yun Cheng ,  Han-Liang Chou ,  Ching-Yeh Chen ,  Yu-Chen Sun ,  Yu-Wen Huang

IPC: H04N19/563 ,  H04N19/593 ,  H04N19/513 ,  H04N19/70

CPC classification number: H04N19/563 ,  H04N19/513 ,  H04N19/593 ,  H04N19/70

Abstract: In order to overcome the issue caused by a decoded block vector (BV) pointing to a reference block overlapping with an unavailable area, various methods are disclosed. According to one method, if the reference block overlaps with an unavailable area, the reference pixels in the unavailable area are generated for IntraBC prediction of the current block by padding from neighbouring available pixels. The padding can be done in the horizontal direction and then the vertical direction. The padding may also done in the vertical direction first and then horizontal direction. In another method, if the reference block overlaps with an unavailable area, the reference pixels in the unavailable area are generated for IntraBC prediction of the current block by using previous decoded pixels in the unavailable area. A pre-defined value may also be used for the unavailable area.

公开(公告)号：US09955185B2

公开(公告)日：2018-04-24

申请号：US14883883

申请日：2015-10-15

Applicant: MediaTek Inc.

Inventor： Tung-Hsing Wu ,  Han-Liang Chou

IPC: H04N19/176 ,  H04N19/593 ,  H04N19/426 ,  H04N19/423

CPC classification number: H04N19/593 ,  H04N19/176 ,  H04N19/423

Abstract: A method of IntraBC (Intra-block copy) coding for a coding region is disclosed. Embodiments of the present invention derive an IntraBC (Intra picture block copy) predictor from a constrained previous reconstructed region so as to reduce storage requirement for the previous reconstructed data. In one embodiment, a maximum absolute vertical BV (block vector) value, MaxV_BV is determined, where MaxV_BV is smaller than a full vertical search range for the coding region. A constrained previous reconstructed region corresponding to previous reconstructed samples processed before the current block is then determined, where the constrained previous reconstructed region includes at least MaxV_MV reconstructed samples in vertical direction above the current block and excludes at least one row of reconstructed samples for the current block with a vertical distance larger than MaxV_MV. Each coding block may correspond to a prediction unit (PU) or a coding unit (CU).

公开(公告)号：US20180103260A1

公开(公告)日：2018-04-12

申请号：US15578184

申请日：2016-06-03

Applicant: MEDIATEK INC.

Inventor： Tzu-Der CHUANG ,  Ping CHAO ,  Ching-Yeh CHEN ,  Yu-Chen Sun ,  Chih-Ming WANG ,  Chia-Yun Cheng ,  Han-Liang Chou ,  Yu-Wen Huang

IPC: H04N19/423 ,  H04N19/51

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

Abstract: A method and apparatus of sharing an on-chip buffer or cache memory for a video coding system using coding modes including Inter prediction mode or Intra Block Copy (IntraBC) mode are disclosed. At least partial pre-deblocking reconstructed video data of a current picture is stored in an on-chip buffer or cache memory. If the current block is coded using IntraBC mode, the pre-deblocking reconstructed video data of the current picture stored in the on-chip buffer or cache memory are used to derive IntraBC prediction for the current block. In some embodiments, if the current block is coded using Inter prediction mode, Inter reference video data from the previous picture stored in the on-chip buffer or cache memory are used to derive Inter prediction for the current block. In another embodiment, the motion compensation/motion estimation unit is shared by the two modes.

公开(公告)号：US20180020213A1

公开(公告)日：2018-01-18

申请号：US15715181

申请日：2017-09-26

Applicant: MEDIATEK INC.

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

IPC: H04N19/115 ,  H04N21/41 ,  H04N19/46 ,  H04N19/463 ,  H04N19/44 ,  H04N19/436 ,  H04N19/184 ,  H04N19/174 ,  H04N21/43 ,  H04N19/172 ,  H04N5/08

CPC classification number: H04N19/119 ,  H04N5/08 ,  H04N19/115 ,  H04N19/172 ,  H04N19/174 ,  H04N19/184 ,  H04N19/436 ,  H04N19/44 ,  H04N19/46 ,  H04N19/463 ,  H04N21/4122 ,  H04N21/4302

Abstract: An image processing method includes at least following steps: partitioning a picture into a plurality of picture regions, wherein each picture region comprises at least one pixel group row, each pixel group row comprises at least one pixel group, and the picture regions comprise a first picture region and a second picture region horizontally adjacent to each other; and performing flatness check upon a specific pixel group in a pixel group row of the first picture region through using at least one pixel borrowed from the second picture region.

公开(公告)号：US20170105012A1

公开(公告)日：2017-04-13

申请号：US15221606

申请日：2016-07-28

Applicant: MEDIATEK INC.

Inventor： Tung-Hsing Wu ,  Li-Heng Chen ,  Han-Liang Chou

IPC: H04N19/186 ,  H04N19/103 ,  H04N19/154 ,  H04N19/176

CPC classification number: H04N19/103 ,  H04N19/147 ,  H04N19/176

Abstract: A method and apparatus of encoding using multiple coding modes with multiple color spaces are disclosed. Weighted distortion is calculated for each candidate mode and a target mode is selected according to information including the weighted distortion. Each candidate coding mode is selected from a coding mode group including at least a first coding mode and a second coding mode, where the first coding mode uses a first color space for encoding one block and the second coding mode uses a second color space for encoding one block, and the first color space is different from the second color space. The weighted distortion corresponds to a weighted sum of distortions of color channels for each color transformed current block using a set of weighting factors and the set of weighting factors is derived based on a color transform associated with a corresponding color space for each coding mode.

公开(公告)号：US09596477B2

公开(公告)日：2017-03-14

申请号：US14444910

申请日：2014-07-28

Applicant: MEDIATEK INC.

Inventor： Han-Liang Chou ,  Kun-Bin Lee

IPC: H04N19/189 ,  H04N19/436

CPC classification number: H04N19/189 ,  H04N19/436

Abstract: Method is disclosed for reducing frame buffer, stream buffer, reconstruction buffer, or latency associated with frame buffer compression in an encoder or decoder with multiple slices of an image frame. The image frame is divided into multiple slices vertically, horizontally or both. One core compressor or decompressor can be used to process two or more slices. The encoding and decoding of two or more slices may be performed in parallel. Instead of encoding an entire slice, the encoder compresses only partial data of one slice before encoding another slice. According to one embodiment, each slice is divided into two or more partitions. The encoder is switched to another slice after encoding one partition of one slice. In another embodiment, the encoder is switched to another slice based the information related to the coding status. The decoding order may be same as the encoding order.

Abstract translation: 公开了用于在具有多个图像帧的编码器或解码器中减少帧缓冲器，流缓冲器，重建缓冲器或与帧缓冲器压缩相关联的延迟的方法。 图像帧垂直，水平或两者分为多个片段。 一个核心压缩器或解压缩器可用于处理两个或多个切片。 两个或多个切片的编码和解码可以并行执行。 代替对整个片段进行编码，编码器仅在编码另一片之前仅压缩一片的部分数据。 根据一个实施例，每个切片被分成两个或更多个分区。 在编码一个分片的一个分区后，编码器切换到另一个分片。 在另一个实施例中，编码器基于与编码状态相关的信息被切换到另一切片。 解码顺序可以与编码顺序相同。