公开(公告)号：US20210409712A1

公开(公告)日：2021-12-30

申请号：US17129504

申请日：2020-12-21

Applicant: BEIJING BAIDU NETCOM SCIENCE AND TECHNOLOGY CO., LTD.

Inventor： Ke LIN ,  Wenpeng DING

IPC: H04N19/124 ,  H04N19/177 ,  H04N19/176 ,  H04N19/136

Abstract: The present disclosure provides a method and an apparatus for coding a video, a device and a medium. An estimated quantization parameter of a target picture in a target GOP is determined. An inter-picture change degree of the target GOP is determined. A propagation ratio of a target picture block to a reference picture block in the target picture is determined based on the estimated quantization parameter of the target picture and the inter-picture change degree. The video is coded based on the propagation ratio.

公开(公告)号：US20210337205A1

公开(公告)日：2021-10-28

申请号：US17353415

申请日：2021-06-21

Applicant: Beijing Baidu Netcom Science and Technology Co., Ltd.

Inventor： Ke LIN ,  Wenpeng DING

IPC: H04N19/124 ,  H04N19/13 ,  H04N19/132 ,  H04N19/176

Abstract: A method and apparatus for adjusting a quantization parameter for adaptive quantization are provided. An implementation of the method may include: acquiring at least one pixel block corresponding to a to-be-compressed image and an initial quantization parameter adjustment value corresponding to the pixel block, the initial quantization parameter adjustment value being generated based on an image objective quality evaluation index; determining a just noticeable difference, JND, threshold corresponding to each pixel point in the at least one pixel block; determining a block JND threshold corresponding to each pixel block, based on the JND threshold corresponding to each pixel point in the at least one pixel block; and adjusting the corresponding initial quantization parameter adjustment value based on the block JND threshold to generate an adjusted quantization parameter adjustment value corresponding to the at least one pixel block.