公开(公告)号：US11418795B2

公开(公告)日：2022-08-16

申请号：US17460360

申请日：2021-08-30

Applicant: University of Electronic Science and Technology of China

Inventor： Ce Zhu ,  Han Qin ,  Yonghua Wang ,  Yipeng Liu ,  Kai Liu

IPC: H04N19/147 ,  H04N19/176 ,  H04N19/51 ,  H04N19/149

Abstract: A temporal domain rate distortion optimization based on video content characteristic and QP-λ correction provides the temporal domain rate distortion optimization based on the video content characteristic and the QP-λ correction for a new generation encoder AV1, wherein according to a previous temporal domain dependency relationship under an HEVC-RA coding structure, a feature of the new generation encoder AV1 and a video sequence feature, an aggregation distortion of a current coding unit and an affected future coding unit is estimated and ta propagation factor of the current coding unit in a temporal domain distortion propagation model is calculated by constructing a temporal domain distortion propagation chain, wherein a Lagrange multiplier is adjusted through a more accurate propagation factor to realize a temporal domain dependency rate distortion optimization, and a relationship of QP-λ is re-corrected and an I frame is adjusted to achieve a better coding effect.

公开(公告)号：US20210185318A1

公开(公告)日：2021-06-17

申请号：US17117142

申请日：2020-12-10

Applicant: University of Electronic Science and Technology of China

Inventor： Ce Zhu ,  Hongwei Guo ,  Yuyang Liu ,  Mao Ye

IPC: H04N19/124 ,  H04N19/177 ,  H04N19/147 ,  H04N19/52

Abstract: A method for optimizing a second coding is provided. The method includes: Setting a quantization parameter of a start frame of a video sequence according to a range of an input quantization parameter QP0 of a coder; performing first coding with a simplified method, and calculating a frame-level temporal impact factor ki of a current frame and a block-level temporal impact factor kB,j of all 16×16 pixel blocks in the current frame; restoring reference list information of the coder after the first coding is completed, and then determining whether a scene is switched; and performing the second coding by setting quantization parameters with different strategies according to whether the scene is switched.

公开(公告)号：US11388444B2

公开(公告)日：2022-07-12

申请号：US17458648

申请日：2021-08-27

Applicant: University of Electronic Science and Technology of China

Inventor： Ce Zhu ,  Lingling Deng ,  Ni Jiang ,  Qiuyue Wang ,  Keke Ding

IPC: H04N19/82 ,  H04N19/117 ,  H04N19/182

Abstract: A loop filtering method based on an adaptive self-guided filtering is mainly an adaptive self-guided filtering technology considering local structure information of an image, wherein a regularization coefficient is adjusted by calculating a weight coefficient of the regularization coefficient to realize the adaptive self-guide filtering, and then a region-level subspace mapping iterative optimization implemented on each region enables a mapping result of the each region to be optimal, wherein the mapping result of a whole image is closer to an original image. Beneficial effects of the loop filtering method are as follows: a filtering effect of a loop filtering is improved, a distortion effect of a reconstruction image is reduced and a reconstruction quality of a video frame is improved, wherein the reconstruction image is more favorable for a subsequent reference and a subjective and objective quality of the video is further improved.

公开(公告)号：US11330270B2

公开(公告)日：2022-05-10

申请号：US17412292

申请日：2021-08-26

Applicant: University of Electronic Science and Technology of China

Inventor： Ce Zhu ,  Lingling Deng ,  Ni Jiang ,  Qiuyue Wang ,  Keke Ding

IPC: H04N19/147 ,  H04N19/109 ,  H04N19/172 ,  H04N19/567

Abstract: A temporal domain rate distortion optimization considering a coding-mode adaptive distortion propagation is provided. A problem of dependency rate distortion optimization based on a temporal domain distortion propagation is induced again according to a temporal domain dependency relationship under an LD structure and a distortion propagation analysis under a skip mode and an inter mode; and an aggregation distortion of a current coding unit and an affected future coding unit are estimated and a propagation factor of a coding unit in a temporal domain distortion propagation model is calculated by constructing a time propagation chain, wherein a Lagrange multiplier is adjusted through an accurate propagation factor to realize a temporal domain dependency rate distortion optimization, and an I frame is subjected to a secondary coding technology to realize the temporal domain dependency rate distortion optimization of the I frame.

公开(公告)号：US11240503B2

公开(公告)日：2022-02-01

申请号：US17117142

申请日：2020-12-10

Applicant: University of Electronic Science and Technology of China

Inventor： Ce Zhu ,  Hongwei Guo ,  Yuyang Liu ,  Mao Ye

IPC: H04N19/124 ,  H04N19/147 ,  H04N19/177 ,  H04N19/52

Abstract: A method for optimizing a second coding is provided. The method includes: Setting a quantization parameter of a start frame of a video sequence according to a range of an input quantization parameter QP0 of a coder; performing first coding with a simplified method, and calculating a frame-level temporal impact factor ki of a current frame and a block-level temporal impact factor kB,j of all 16×16 pixel blocks in the current frame; restoring reference list information of the coder after the first coding is completed, and then determining whether a scene is switched; and performing the second coding by setting quantization parameters with different strategies according to whether the scene is switched.