公开(公告)号：WO2023009469A1

公开(公告)日：2023-02-02

申请号：PCT/US2022/038249

申请日：2022-07-25

Applicant: DOLBY LABORATORIES LICENSING CORPORATION

Inventor： HUANG, Tsung-Wei ,  SU, Guan-Ming

IPC: G06V40/16

Abstract: Methods and corresponding systems to process face regions are disclosed. The described methods include providing face bounding boxes and confidence levels for the faces, generating a histogram of the pixels and the faces, generating a probability of face, and generating a face probability map. A face contrast adjustment and a face saturation adjustment can be applied to the face probability map.

公开(公告)号：WO2022072884A1

公开(公告)日：2022-04-07

申请号：PCT/US2021/053241

申请日：2021-10-01

Applicant: DOLBY LABORATORIES LICENSING CORPORATION

Inventor： HUANG, Tsung-Wei ,  SU, Guan-Ming ,  GADGIL, Neeraj J.

IPC: H04N19/85 ,  G09G5/10

Abstract: A global index value is generated for selecting a global reshaping function for an input image of a relatively low dynamic range using luma codewords in the input image. Image filtering is applied to the input image to generate a filtered image. The filtered values of the filtered image provide a measure of local brightness levels in the input image. Local index values are generated for selecting specific local reshaping functions for the input image using the global index value and the filtered values of the filtered image. A reshaped image of a relatively high dynamic range is generated by reshaping the input image with the specific local reshaping functions selected using the local index values.

公开(公告)号：WO2022061089A1

公开(公告)日：2022-03-24

申请号：PCT/US2021/050838

申请日：2021-09-17

Applicant: DOLBY LABORATORIES LICENSING CORPORATION

Inventor： KADU, Harshad ,  SU, Guan-Ming ,  GADGIL, Neeraj J. ,  HUANG, Tsung-Wei

IPC: H04N19/436 ,  H04N19/117 ,  H04N19/127 ,  H04N19/142 ,  H04N19/192 ,  H04N19/33 ,  H04N19/85

Abstract: In a cloud-based system for encoding high dynamic range (HDR) video, each node receives a video segment and bumper frames. Each segment is subdivided into primary scenes and secondary scenes to derive scene-based forward reshaping functions that minimize the amount of reshaping-related metadata when coding the video segment, while maintaining temporal continuity among scenes processed by multiple nodes. Methods to generate scene-based forward and backward reshaping functions to optimize video coding and improve the coding efficiency of reshaping-related metadata are also examined.

公开(公告)号：WO2022260907A1

公开(公告)日：2022-12-15

申请号：PCT/US2022/031795

申请日：2022-06-01

Applicant: DOLBY LABORATORIES LICENSING CORPORATION

Inventor： HUANG, Tsung-Wei ,  SU, Guan-Ming

IPC: H04N7/01 ,  G06V20/40

Abstract: Methods and systems to detect and blend a surround area to avoid filtering artifact due to the area in image filtering are disclosed. The described methods include a compensation step and can be applied to arbitrary images with padded areas of arbitrary shape, such as letterboxes, pillar-boxes, ovals, or other shapes, including logos and close captions. Such methods detect the surround areas in the image with possible compression artifact and noise, and then perform blending to minimize the effects of the surround areas for any arbitrary image filtering operations.

公开(公告)号：WO2021202933A1

公开(公告)日：2021-10-07

申请号：PCT/US2021/025464

申请日：2021-04-01

Applicant: DOLBY LABORATORIES LICENSING CORPORATION

Inventor： SU, Guan-Ming ,  KADU, Harshad ,  HUANG, Tsung-Wei

IPC: H04N19/117 ,  H04N19/154 ,  H04N19/172 ,  H04N19/192 ,  H04N19/182 ,  H04N19/80 ,  H04N19/85 ,  H04N19/186 ,  H04N19/98

Abstract: In an encoder, a high-dynamic range (HDR) image is encoded using a family of local forward reshaping functions selected according to an array of forward mapping indices (FMI) indicating which local forward reshaping function needs to be used for each pixel in the HDR image to generate a reshaped standard dynamic range (SDR) image. A decoder, given the reshaped SDR image, iteratively generates a reconstructed HDR image and estimated reshaped SDR images by adjusting a local FMI array and a local array of backward mapping indices (BMI) until an error metric related to the difference between the local BMI and FMI arrays and the difference between the estimate SDR images and the reshaped SDR image satisfy a convergence criterion. Techniques for generating families of local forward reshaping functions and local backward reshaping functions based on a global forward reshaping function are also presented.