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公开(公告)号：US20230171436A1
公开(公告)日：2023-06-01
申请号：US17768307
申请日：2020-10-16
发明人： Qing Song , Arun Raj , Guan-Ming Su
IPC分类号： H04N19/86 , H04N19/186 , H04N19/46 , H04N19/132
CPC分类号： H04N19/86 , H04N19/46 , H04N19/132 , H04N19/186
摘要： A backward reshaping mapping table is initially generated as an inverse of a forward reshaping mapping table. The backward reshaping mapping table is updated by replacing the content-mapped luminance codewords with forward reshaped luminance codewords generated by applying a luminance forward mapping to the sampled luminance codewords. The luminance forward mapping is constructed from the forward reshaping mapping table. The backward reshaping mapping table and the luminance forward mapping are used to generate backward reshaping mappings for creating a reconstructed image from a forward reshaped image. The forward reshaped image is encoded, in a video signal, along with image metadata specifying the backward reshaping mappings. A recipient device of the video signal applies the backward reshaping mappings to the forward reshaped image to create the reconstructed image of the second dynamic range.
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公开(公告)号：US11341624B2
公开(公告)日：2022-05-24
申请号：US17267369
申请日：2019-08-07
发明人： Neeraj J. Gadgil , Guan-Ming Su , Qiang Zhu , Qing Song
IPC分类号： G06T5/00
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.
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公开(公告)号：US20220076384A1
公开(公告)日：2022-03-10
申请号：US17415674
申请日：2019-12-10
发明人： Neeraj J. Gadgil , Qing Song , Guan-Ming Su
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.
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公开(公告)号：US20210350511A1
公开(公告)日：2021-11-11
申请号：US17267369
申请日：2019-08-07
发明人： Neeraj J. Gadgil , Guan-Ming Su , Qiang Zhu , Qing Song
IPC分类号： G06T5/00
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.
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公开(公告)号：US10244244B2
公开(公告)日：2019-03-26
申请号：US15795093
申请日：2017-10-26
IPC分类号： H04N7/12 , H04N11/02 , H04N11/04 , H04N19/186 , G06T5/00 , H04N19/68 , H04N19/182 , H04N19/587 , H04N19/98 , G06T7/00 , G06T9/00 , G09G5/00
摘要： Methods for screen-adaptive decoding of video with high dynamic range (HDR) are described. The methods combine the traditional compositing and display management steps into one screen-adaptive compositing step. Given decoded standard dynamic range (SDR) input data, metadata related to the prediction of output HDR data in a reference dynamic range, and the dynamic range of a target display, new output luma and chroma prediction functions are generated that map directly the input SDR data to output HDR data in the target dynamic range, thus eliminating the display management step.
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公开(公告)号：US11277627B2
公开(公告)日：2022-03-15
申请号：US17054495
申请日：2019-05-09
发明人： Qing Song , Harshad Kadu , Guan-Ming Su
IPC分类号： H04N19/186 , H04N19/105 , H04N19/159 , H04N19/23 , H04N19/44
摘要： 3D mapping statistics are generated for a first image of a first dynamic range and a second image of a second dynamic range different from the first dynamic range. Multivariate multiple regression (MMR) coefficients are generated by solving an optimization problem formulated using an MMR matrix built with the 3D mapping statistics without a letterbox constraint, and used to generate chroma mappings for predicting chroma codeword values of the second image. It is determined whether a letterbox exists in the images. If so, it is determined whether the chroma mappings accurately predict chroma codeword values in the second image. A reconstructed image generated by a recipient device by backward reshaping one of the images is rendered by a display device operating in conjunction with the recipient device.
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公开(公告)号：US10609424B2
公开(公告)日：2020-03-31
申请号：US16294875
申请日：2019-03-06
发明人： Qing Song , Harshad Kadu , Guan-Ming Su
IPC分类号： H04N19/98 , H04N19/186 , H04N19/14 , H04N19/169 , H04N19/30 , H04N19/463
摘要： A standard dynamic range (SDR) image is received. Composer metadata of the first level through the N-th level is generated. Composer metadata of the j-th level is generated based on the composer metadata of the first level through (j−1)-th level. The composer metadata of the first level through the composer metadata of the j-th level is to be used for mapping the SDR image to the j-th target image specifically optimized for the j-th reference target display. The SDR image is encoded with the composer metadata of the first level through the k-th level in an output SDR video signal, where 1
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公开(公告)号：US20160125579A1
公开(公告)日：2016-05-05
申请号：US14929587
申请日：2015-11-02
发明人： Qing Song , Guan-Ming Su , Qian Chen
CPC分类号： G06T5/008 , G06T5/002 , G06T5/20 , G06T2207/10016 , G06T2207/20012 , G06T2207/20208 , H04N19/117 , H04N19/154 , H04N19/182 , H04N19/30
摘要： A sparse FIR filter can be used to process an image in order to rectify imaging artifacts. In a first example application, the sparse FIR filter is applied as a selective sparse FIR filter that examines a set of selected neighboring pixels of an original pixel in order to identify smooth areas of the image and to selectively apply filtering to only the smooth areas of the image. The parameters of selective filtering are selected based on the characteristics of an inter-layer predictor. In a second example application, the sparse FIR filter is applied as an edge aware selective sparse FIR filter that examines additional neighboring pixels to the set of selected pixels in order to identify edges and carry out selective filtering of smooth areas of the image. Examples for detecting and removing banding artifacts during the coding of high-dynamic range images are provided.
摘要翻译： 可以使用稀疏FIR滤波器来处理图像，以纠正成像伪像。 在第一示例性应用中，稀疏FIR滤波器被应用为选择性稀疏FIR滤波器，其检查原始像素的所选相邻像素的集合，以便识别图像的平滑区域并且仅选择性地将滤波应用于仅平滑区域的平滑区域 图片。 选择性滤波的参数是根据层间预测因子的特征来选择的。 在第二示例应用中，稀疏FIR滤波器被应用为边缘识别选择性稀疏FIR滤波器，其检查所选择的像素集合中的附加相邻像素，以便识别边缘并对图像的平滑区域进行选择性滤波。 提供了在高动态范围图像的编码期间检测和去除条带伪像的示例。
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公开(公告)号：US11962760B2
公开(公告)日：2024-04-16
申请号：US17764394
申请日：2020-09-29
发明人： Guan-Ming Su , Harshad Kadu , Qing Song , Neeraj J. Gadgil
IPC分类号： H04N19/105 , H04N19/132 , H04N19/154 , H04N19/196 , H04N19/436
CPC分类号： H04N19/105 , H04N19/132 , H04N19/154 , H04N19/196 , H04N19/436
摘要： A set of tensor-product B-Spline (TPB) basis functions is determined. A set of selected TPB prediction parameters to be used with the set of TPB basis functions for generating predicted image data in mapped images from source image data in source images of a source color grade is generated. The set of selected TPB prediction parameters is generated by minimizing differences between the predicted image data in the mapped images and reference image data in reference images of a reference color grade. The reference images correspond to the source images and depict same visual content as depicted by the source images. The set of selected TPB prediction parameters is encoded in a video signal as a part of image metadata along with the source image data in the source images. The mapped images are caused to be reconstructed and rendered with a recipient device of the video signal.
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公开(公告)号：US11818400B2
公开(公告)日：2023-11-14
申请号：US17768307
申请日：2020-10-16
发明人： Qing Song , Arun Raj , Guan-Ming Su
IPC分类号： H04N19/00 , H04N19/86 , H04N19/132 , H04N19/186 , H04N19/46
CPC分类号： H04N19/86 , H04N19/132 , H04N19/186 , H04N19/46
摘要： A backward reshaping mapping table is initially generated as an inverse of a forward reshaping mapping table. The backward reshaping mapping table is updated by replacing the content-mapped luminance codewords with forward reshaped luminance codewords generated by applying a luminance forward mapping to the sampled luminance codewords. The luminance forward mapping is constructed from the forward reshaping mapping table. The backward reshaping mapping table and the luminance forward mapping are used to generate backward reshaping mappings for creating a reconstructed image from a forward reshaped image. The forward reshaped image is encoded, in a video signal, along with image metadata specifying the backward reshaping mappings. A recipient device of the video signal applies the backward reshaping mappings to the forward reshaped image to create the reconstructed image of the second dynamic range.
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