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1. 发明申请

WO2023009469A1 FACE REGION DETECTION AND LOCAL RESHAPING ENHANCEMENT 审中-公开
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
申请人： DOLBY LABORATORIES LICENSING CORPORATION
发明人： HUANG, Tsung-Wei , SU, Guan-Ming
IPC分类号： G06V40/16
摘要： 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.

2. 发明申请

WO2022260902A1 CHAINED RESHAPING FUNCTION OPTIMIZATION 审中-公开
公开(公告)号：WO2022260902A1
公开(公告)日：2022-12-15
申请号：PCT/US2022/031767
申请日：2022-06-01
申请人： DOLBY LABORATORIES LICENSING CORPORATION
发明人： SU, Guan-Ming
IPC分类号： H04N19/186 , H04N19/46 , H04N19/70 , H04N19/85 , H04N19/98 , G06T5/00
摘要： An input image to a pipeline of chained reshaping functions is received. Reference images are generated from the input image. The input image and the reference images are used to determine operational parameters for chained reshaping functions in the pipeline of chained reshaping functions. A reshaped image generated from one or more of the chained reshaping functions is encoded in a video signal along with image metadata. The image metadata includes some or all of the operational parameters specifying the chained reshaping functions. A recipient device of the video signal is caused to use the image metadata and the reshaped image to generate a reconstructed image.

3. 发明申请

WO2022164929A1 IMAGE ENHANCEMENT VIA GLOBAL AND LOCAL RESHAPING 审中-公开
公开(公告)号：WO2022164929A1
公开(公告)日：2022-08-04
申请号：PCT/US2022/013941
申请日：2022-01-26
申请人： DOLBY LABORATORIES LICENSING CORPORATION
发明人： SU, Guan-Ming , KADU, Harshad , KLITTMARK, Per Jonas Andreas , CHEN, Tao
IPC分类号： H04N19/117 , H04N19/154 , H04N19/182 , H04N19/186 , H04N19/98
摘要： A first reshaping mapping is performed on a first image represented in a first domain to generate a second image represented in a second domain. The first domain is of a first dynamic range different from a second dynamic range of which the second domain is. A second reshaping mapping is performed on the second image represented in the second domain to generate a third image represented in the first domain. The third image is perceptually different from the first image in at least one of: global contrast, global saturation, local contrast, local saturation, etc. A display image is derived from the third image and rendered on a display device.

4. 发明申请

WO2022006346A1 DISTRIBUTION OF HIGH DYNAMIC RANGE IMAGES IN A MIXED CAPABILITY PLAYBACK SYSTEM 审中-公开
公开(公告)号：WO2022006346A1
公开(公告)日：2022-01-06
申请号：PCT/US2021/040004
申请日：2021-06-30
申请人： DOLBY LABORATORIES LICENSING CORPORATION
发明人： ATKINS, Robin , SU, Guan-Ming , LAKSHMINARAYANAN, Gopi
IPC分类号： H04N21/2343 , H04N21/235 , H04N21/63 , H04N1/64 , H04N21/234327 , H04N21/2358 , H04N21/631
摘要： A method for distributing High Dynamic Range (HDR) content to playback devices for displaying images where the HDR content is encoded to an HDR bitstream and the HDR bitstream is subsequently decoded by a playback device. The HDR bitstream contains auxiliary metadata packets that are based upon the processing capability of the playback device.

5. 发明申请

WO2021168001A1 JOINT FORWARD AND BACKWARD NEURAL NETWORK OPTIMIZATION IN IMAGE PROCESSING 审中-公开
公开(公告)号：WO2021168001A1
公开(公告)日：2021-08-26
申请号：PCT/US2021/018407
申请日：2021-02-17
申请人： DOLBY LABORATORIES LICENSING CORPORATION
发明人： SU, Guan-Ming
IPC分类号： H04N19/117 , H04N19/134 , H04N19/186 , H04N19/46 , G06T5/00 , H04N19/30
摘要： A source color grade and a destination color grade may be received by an end-to-end image mapping pipeline comprising forward and backward paths. Forward neural networks in the forward path may be applied to generate, from the source color grade, a forward reshaped color grade corresponding to the destination color grade. Backward neural networks in the backward path may be applied to generate, from the forward reshaped color grade, a backward reshaped color grade corresponding to the source color grade. An overall neural network cost function may be specified for the forward path and the backward path to generate a cost that may be used as a basis for determining operational parameters for the forward and backward neural networks.

6. 发明申请

WO2021113400A1 USER-GUIDED IMAGE SEGMENTATION METHODS AND PRODUCTS 审中-公开
公开(公告)号：WO2021113400A1
公开(公告)日：2021-06-10
申请号：PCT/US2020/062942
申请日：2020-12-02
申请人： DOLBY LABORATORIES LICENSING CORPORATION
发明人： KHALILIAN-GOURTANI, Amirhossein , GADGIL, Neeraj J. , SU, Guan-Ming
IPC分类号： G06K9/62
摘要： A method for image segmentation includes (a) clustering, based upon k-means clustering, pixels of an image into first clusters, (b) outputting a cluster map of the first clusters (c) re-clustering the pixels into a new plurality of non-disjoint pixel-clusters, and (d) classifying the non-disjoint pixel-clusters in categories, according to a user-indicated classification. Another method for image segmentation includes (a) forming a graph with each node of the graph corresponding to a first respective non-disjoint pixel-cluster of the image and connected to each terminal of the graph and to all other nodes corresponding to other respective non-disjoint pixel-clusters that, in the image, are within a neighborhood of the first respective non-disjoint pixel-cluster, (b) setting weights of connections of the graph according to a user-indicated classification in categories respectively associated with the terminals, and (c) segmenting the image into the categories by cutting the graph based upon the weights.

7. 发明申请

WO2020131494A1 IMAGE DEBANDING USING ADAPTIVE SPARSE FILTERING 审中-公开
公开(公告)号：WO2020131494A1
公开(公告)日：2020-06-25
申请号：PCT/US2019/065457
申请日：2019-12-10
申请人： DOLBY LABORATORIES LICENSING CORPORATION
发明人： GADGIL, Neeraj J. , SONG, Qing , SU, Guan-Ming
IPC分类号： H04N19/117 , G06T5/00 , H04N19/86 , H04N5/14 , H04N19/192 , H04N19/136 , H04N19/182 , H04N19/154
摘要： Methods and systems for reducing banding artifacts when displaying images are described. Identified image bands are filtered using an adaptive sparse finite response filter, where the tap-distance in the sparse filter is adapted according to an estimated width of each image band. Image debanding may be performed across multiple pixel orientations, such as rows, columns, a 45-degree angle, or a -45-degree angle. Given a threshold to decide whether sparse filtering needs to be performed or not, an iterative debanding process is also proposed.

8. 发明申请

WO2020033573A1 REDUCING BANDING ARTIFACTS IN HDR IMAGING VIA ADAPTIVE SDR-TO-HDR RESHAPING FUNCTIONS 审中-公开
公开(公告)号：WO2020033573A1
公开(公告)日：2020-02-13
申请号：PCT/US2019/045541
申请日：2019-08-07
申请人： DOLBY LABORATORIES LICENSING CORPORATION
发明人： GADGIL, Neeraj J. , SU, Guan-Ming , ZHU, Qiang , SONG, Qing
IPC分类号： H04N19/117 , H04N19/98
摘要： Methods and systems for reducing banding artifacts when displaying high-dynamic-range images are described. Given an input image in a first dynamic range, and an input backward reshaping function mapping codewords from the first dynamic range to a second dynamic range, wherein the second dynamic range is equal or higher than the first dynamic range, statistical data based on the input image and the input backward reshaping function are generated to estimate the risk of banding artifacts in a target image in the second dynamic range generated by applying the input backward reshaping function to the input image. Separate banding alleviation algorithms are applied in the darks and highlights parts of the first dynamic range to generate a modified backward reshaping function, which when applied to the input image to generate the target image eliminates or reduces banding in the target image.

9. 发明申请

WO2019060778A1 BACKWARD COMPATIBLE DISPLAY MANAGEMENT METADATA COMPRESSION 审中-公开
公开(公告)号：WO2019060778A1
公开(公告)日：2019-03-28
申请号：PCT/US2018/052292
申请日：2018-09-21
申请人： DOLBY LABORATORIES LICENSING CORPORATION
发明人： SU, Guan-Ming , GADGIL, Neeraj J. , CHEN, Tao , QU, Sheng
IPC分类号： H04N19/70 , H04N21/84 , H04N19/463
摘要： Sequence-level parameters are generated for an image frame sequence including sequence-level indicators for indicating metadata types present for each image frame in the sequence of image frames. Frame-present parameters are generated for a specific image frame in the sequence including frame-present indicators corresponding to the metadata types as indicated in the sequence-level parameters. The frame-present indicators identify first metadata types for which metadata parameter values are to be encoded in a coded bitstream as metadata payloads. The image frame sequence, the sequence-level parameters, the frame-present parameters and the metadata payloads are encoded in the coded bitstream. A recipient device can generate, from the specific image frame based partly on the metadata parameter values determined for the first metadata types, a target display image for a target display.

10. 发明申请

WO2017003525A1 REAL-TIME CONTENT-ADAPTIVE PERCEPTUAL QUANTIZER FOR HIGH DYNAMIC RANGE IMAGES 审中-公开
标题翻译：用于高动态范围图像的实时内容自适应量化器
公开(公告)号：WO2017003525A1
公开(公告)日：2017-01-05
申请号：PCT/US2016/020232
申请日：2016-03-01
申请人： DOLBY LABORATORIES LICENSING CORPORATION
发明人： SU, Guan-Ming
IPC分类号： H04N19/136 , H04N19/98
CPC分类号： H04N19/124 , H04N19/136 , H04N19/186 , H04N19/98
摘要： Noise levels in pre-reshaped codewords of a pre-reshaped bit depth in pre-reshaped images within a time window of a scene are calculated. Per-bin minimal bit depth values are computed for pre-reshaped codeword bins based on the calculated noise levels in the pre-reshaped codewords. Each per-bin minimal bit depth value corresponds to a minimal bit depth value for a respective pre-reshaped codeword bin. A specific codeword mapping function for a specific pre-reshaped image in the pre-reshaped image is generated based on the pre-reshaped bit depth, the per-bin minimal bit depth values, and a target bit depth smaller than the pre-reshaped bit depth. The specific codeword mapping function is applied to specific pre-reshaped codewords of the specific pre-reshaped image to generate specific target codewords of the target bit depth for a specific output image.
摘要翻译：计算在场景的时间窗内的预重组图像中的预重新形成的位深度的预重新定标码字中的噪声水平。基于预重新定标码字中计算出的噪声电平，为预重新形成的码字箱计算每位最小位深度值。每个每个最小位深度值对应于相应的预重新形成的码字仓的最小位深度值。基于预重新形成的比特深度，每个最小比特深度值和比预分解比特的目标比特深度生成用于预重新映像的特定预重新映像的特定码字映射功能深度。特定码字映射函数被应用于特定预重新映象图像的特定预重新映射码字，以产生特定输出图像的目标比特深度的特定目标码字。

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