公开(公告)号：US20200169760A1

公开(公告)日：2020-05-28

申请号：US16203326

申请日：2018-11-28

Applicant: ATI Technologies ULC

Inventor： Jiao Wang ,  Lei Zhang ,  Ying Zhang ,  Edward A. Harold

IPC: H04N19/87 ,  H04N19/142 ,  H04N19/132 ,  H04N19/159 ,  H04N19/179 ,  H04N19/176

Abstract: Systems, methods, and devices for scene change detection and image encoding. A sequence of image frames is input. For a first image frame of the sequence, a first total sum of absolute transformed differences (SATD) is calculated. For a second frame of the sequence, a second total SATD is calculated. An absolute difference between the first total SATD and the second total SATD is calculated. If the absolute difference meets or exceeds a threshold, the second frame and a third frame of the sequence subsequent to the second frame are encoded based on a scene change, and the second frame and the third frame are transmitted. If the absolute difference does not meet or exceed the threshold, the second frame is encoded based on a same scene and the second frame is transmitted.

公开(公告)号：US11563945B2

公开(公告)日：2023-01-24

申请号：US16588975

申请日：2019-09-30

Applicant: Advanced Micro Devices, Inc. ,  ATI Technologies ULC

Inventor： Jiao Wang ,  Ying Zhang ,  Richard George ,  Edward A. Harold ,  Zhenhua Yang

IPC: H04N19/124 ,  H04N19/13 ,  H04N19/146 ,  H04N19/172 ,  H04N19/176 ,  H04N19/182 ,  H04N19/196

Abstract: A technique for determining an adaptive quantization parameter offset for a block of encoded video includes obtaining a rate control factor for the quantization parameter, determining a content-based quantization parameter factor for the quantization parameter, determining an adaptive variance based quantization offset based on content-based quantization parameter factors for a frame prior to the current frame, and combining the rate control factor, the content-based quantization parameter factor, and the adaptive offset to generate the quantization parameter.

公开(公告)号：US20210099705A1

公开(公告)日：2021-04-01

申请号：US16588975

申请日：2019-09-30

Applicant: Advanced Micro Devices, Inc. ,  ATI Technologies ULC

Inventor： Jiao Wang ,  Ying Zhang ,  Richard George ,  Edward A. Harold ,  Zhenhua Yang

IPC: H04N19/124 ,  H04N19/146 ,  H04N19/182 ,  H04N19/176 ,  H04N19/172 ,  H04N19/196 ,  H04N19/13

Abstract: A technique for determining an adaptive quantization parameter offset for a block of encoded video includes obtaining a rate control factor for the quantization parameter, determining a content-based quantization parameter factor for the quantization parameter, determining an adaptive variance based quantization offset based on content-based quantization parameter factors for a frame prior to the current frame, and combining the rate control factor, the content-based quantization parameter factor, and the adaptive offset to generate the quantization parameter.

公开(公告)号：US20170085871A1

公开(公告)日：2017-03-23

申请号：US14861049

申请日：2015-09-22

Applicant: ATI Technologies ULC

Inventor： Jiao Wang ,  Ying Zhang

IPC: H04N19/105 ,  H04N19/166 ,  H04N19/895

CPC classification number: H04N19/105 ,  H04N19/109 ,  H04N19/166 ,  H04N19/172 ,  H04N19/177 ,  H04N19/503 ,  H04N19/895

Abstract: In a video coding system, a method includes transmitting a first encoded picture from an encoder for reception by a decoder as part of an encoded bitstream. The first encoded picture acts a first reference picture for one or more subsequent pictures in the output encoded bitstream. The method further includes receiving, at the encoder, an indication from the decoder that there was an error in receiving the first encoded picture, and selecting a second reference picture from a buffer of reference pictures at the encoder. The selected second reference picture selected as being earlier than the first reference picture in an encoding order of the encoded bitstream. The method further includes configuring the encoder to encode a set of one or more pictures for the encoded bitstream using the second reference picture and signaling the first reference picture as a non-reference picture.