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115 条记录 (耗时 0.033 秒)

    Up-conversion to content adaptive perceptual quantization video signals
    41.
    发明授权
    Up-conversion to content adaptive perceptual quantization video signals 有权

    公开(公告)号：US10609372B2

    公开(公告)日：2020-03-31

    申请号：US16139965

    申请日：2018-09-24

    申请人： DOLBY LABORATORIES LICENSING CORPORATION

    发明人： Guan-Ming Su ,  Amin Kheradmand ,  Navaneeth Kamballur Kottayil

    IPC分类号： H04N19/176 ,  H04N19/14 ,  H04N19/124 ,  H04N19/36 ,  H04N19/37 ,  H04N19/11 ,  H04N19/117

    摘要： Input minimal noise levels of are computed over input codeword bins based on image content in input images of an input bit depth. The minimal noise levels are adjusted to generate approximated minimal noise levels of a higher bit depth. The approximated minimal noise levels are used to generate per-bin bit depths over the input codeword bins. The input codeword bins are classified into first codeword bins that have relatively high risks of banding artifacts and some other input codeword bins that have relatively low or zero risks of banding artifacts based on the per-bin bit depths. Portions of bit depths from the other input codeword bins are moved to the first input codeword bins to generate modified per-bin bit depths. A forward reshaping function constructed from the modified per-bin bit depths is used to reshape the input images into reshaped images used to generate output images.

    Video coding and delivery with both spatial and dynamic range scalability
    42.
    发明授权
    Video coding and delivery with both spatial and dynamic range scalability 有权

    公开(公告)号：US10575005B2

    公开(公告)日：2020-02-25

    申请号：US15745647

    申请日：2016-07-20

    申请人： Dolby Laboratories Licensing Corporation

    发明人： Guan-Ming Su ,  Sheng Qu ,  Samir N. Hulyalkar ,  David Brooks

    IPC分类号： H04N19/33 ,  H04N19/59

    摘要： In a method to code and transmit scalable HDR video signals, HDR signals are processed and encoded in the IPT-PQ color space to generate a base layer at reduced spatial resolution and/or dynamic range, and an enhancement layer with a residual signal. A signal reshaping block before the base layer encoder allows for improved coding of HDR signals using a reduced bit depth. A decoder can use a BL decoder and backward reshaping to generate a decoded BL HDR signal at a reduced dynamic range and/or spatial resolution, or it can combine the decoded BL HDR signal and the EL stream to generate a decoded HDR signal at full dynamic range and full resolution.

    Low-complexity lookup table construction with reduced interpolation error
    43.
    发明授权
    Low-complexity lookup table construction with reduced interpolation error 有权

    公开(公告)号：US10542269B2

    公开(公告)日：2020-01-21

    申请号：US15773525

    申请日：2016-12-07

    申请人： Dolby Laboratories Licensing Corporation

    发明人： Harshad Kadu ,  Guan-Ming Su ,  Hanyang Sun

    IPC分类号： H04N19/44 ,  G06T5/00 ,  H04N19/186 ,  H04N19/82

    摘要： In a method to reconstruct a high dynamic range video signal, a decoder receives parameters in the input bitstream to generate a prediction function. Using the prediction function, it generates a first set of nodes for a first prediction lookup table, wherein each node is characterized by an input node value and an output node value.Then, it modifies the output node values of one or more of the first set of nodes to generate a second set of nodes for a second prediction lookup table, and generates output prediction values using the second lookup table. Low-complexity methods to modify the output node value of a current node in the first set of nodes based on computing modified slopes between the current node and nodes surrounding the current node are presented.

    Inter-layer prediction for signals with enhanced dynamic range
    46.
    发明授权
    Inter-layer prediction for signals with enhanced dynamic range 有权

    公开(公告)号：US10200703B2

    公开(公告)日：2019-02-05

    申请号：US15534170

    申请日：2016-02-16

    申请人： DOLBY LABORATORIES LICENSING CORPORATION

    发明人： Guan-Ming Su ,  Qian Chen

    IPC分类号： H04N19/33 ,  H04N19/30 ,  H04N19/463 ,  H04N19/61

    摘要： Pixel data of a video sequence with enhanced dynamic range (EDR) are predicted based on pixel data of a corresponding video sequence with standard dynamic range (SDR) and an inter-layer predictor. Under a highlights clipping constrain, conventional SDR to EDR prediction is adjusted as follows: a) given a highlights threshold, the SDR to EDR predictor is adjusted to output a fixed output value for all input SDR pixel values larger than the highlights threshold, and b) given a dark-regions threshold, the residual values between the input EDR signal and its predicted value are set to zero for all input SDR pixel values lower than the dark-regions threshold. Example processes to determine the highlights and dark-regions thresholds and whether highlights clipping is occurring are provided.

    Efficient transcoding for backward-compatible wide dynamic range codec
    47.
    发明授权
    Efficient transcoding for backward-compatible wide dynamic range codec 有权

    公开(公告)号：US10136147B2

    公开(公告)日：2018-11-20

    申请号：US14731656

    申请日：2015-06-05

    申请人： Dolby Laboratories Licensing Corporation

    发明人： Guan-Ming Su ,  Tao Chen

    IPC分类号： H04N19/40 ,  H04N19/30 ,  H04N19/11 ,  H04N19/124 ,  H04N19/182 ,  H04L29/06

    摘要： An intermediate bitstream generated by a first-stage transcoding system from an initial transmission package is received. The intermediate bitstream comprises base layer (BL) and enhancement layer (EL) signals. The combination of the BL and EL signals of the intermediate bitstream represents compressed wide dynamic range images. The BL signal of the intermediate bitstream alone represents compressed standard dynamic range images. A targeted transmission package is generated based on the intermediate bitstream. The targeted transmission package comprises BL and EL signals. The BL signal of the targeted transmission package may be directly transcoded from the BL signal of the intermediate bitstream alone.