公开(公告)号：US10419758B2

公开(公告)日：2019-09-17

申请号：US15918646

申请日：2018-03-12

Applicant: MEDIATEK INC.

Inventor： Ching-Yeh Chen ,  Tzu Der Chuang ,  Chih-Wei Hsu ,  Yu-Wen Huang

IPC: H04N19/117 ,  H04N19/154 ,  H04N19/182 ,  H04N19/172 ,  H04N19/82 ,  H04N19/119 ,  H04N19/597 ,  H04N19/176 ,  H04N19/14 ,  H04N19/17

Abstract: Aspects of the disclosure provide a method for non-local adaptive loop filtering. The method can include receiving reconstructed picture, dividing the picture into current patches, forming patch groups each including a current patch and a number of reference patches, determining a noise level for each of the patch groups, and denoising the patch groups with a non-local denoising technology. The determining a noise level for each of the patch groups can include calculating a pixel variance for a respective patch group, determining a pixel standard deviation (SD) of the respective patch group according to the calculated pixel variance by searching in a lookup table that indicates mapping relationship between patch group pixel SDs and patch group pixel variances, and calculating a noise level for the respective patch group based on a compression noise model that is a function of the pixel SD.

公开(公告)号：US10855997B2

公开(公告)日：2020-12-01

申请号：US15946765

申请日：2018-04-06

Applicant: MediaTek Inc.

Inventor： Man-Shu Chiang ,  Chih-Wei Hsu ,  Tzu Der Chuang ,  Ching-Yeh Chen

IPC: H04N19/176 ,  H04N19/61 ,  H04N19/122 ,  H04N19/157 ,  H04N19/124

Abstract: A method and apparatus related to secondary transform operations. In which, the non-zero transform coefficients in a particular subset of the transform coefficients of the block of pixels is counted and compared with a particular threshold so as to determine whether or not to perform the secondary transform on the block of pixels. Besides, the optimal secondary transform kernel size is derived implicitly based on the size of the block, or derived explicitly based on a flag coded by using an adaptive code word.

公开(公告)号：US20180302631A1

公开(公告)日：2018-10-18

申请号：US15946765

申请日：2018-04-06

Applicant: MediaTek Inc.

Inventor： Man-Shu Chiang ,  Chih-Wei Hsu ,  Tzu Der Chuang ,  Ching-Yeh Chen

IPC: H04N19/176 ,  H04N19/124 ,  H04N19/61 ,  H04N19/122

Abstract: A method and apparatus related to secondary transform operations. In which, the non-zero transform coefficients in a particular subset of the transform coefficients of the block of pixels is counted and compared with a particular threshold so as to determine whether or not to perform the secondary transform on the block of pixels. Besides, the optimal secondary transform kernel size is derived implicitly based on the size of the block, or derived explicitly based on a flag coded by using an adaptive code word.