公开(公告)号：WO2022132306A1

公开(公告)日：2022-06-23

申请号：PCT/US2021/056389

申请日：2021-10-23

Applicant: FACEBOOK TECHNOLOGIES, LLC

Inventor： WEBB, Richard

IPC: H04N19/124 ,  H04N19/176 ,  H04N19/98

Abstract: In an embodiment, a method involves receiving a pixel array, compressing the pixel array by, for each pixel block of multiple pixel blocks: accessing pixel values associated with pixels in the pixel block, determining a range of the pixel values and an endpoint pixel value in the range, determining quantization levels corresponding to different values within the range of the pixel values, selecting a quantization level from the quantization levels for each of the pixel values in the pixel block, and encoding the pixel values in the pixel block using their respective selected quantization levels and the endpoint pixel value.

公开(公告)号：WO2021263029A1

公开(公告)日：2021-12-30

申请号：PCT/US2021/038962

申请日：2021-06-24

Applicant: QUALCOMM INCORPORATED

Inventor： CHEN, Chun-Chi ,  HUANG, Han ,  SEREGIN, Vadim ,  KARCZEWICZ, Marta

IPC: H04N19/82 ,  H04N19/117 ,  H04N19/136 ,  H04N19/176 ,  H04N19/98

Abstract: An example device for decoding video data includes memory configured to store the video data and one or more processors implemented in circuitry and communicatively coupled to the memory. The one or more processors are configured to reshape a pixel domain reference template block using a forward mapping function into a mapped domain reference template block and derive local illumination compensation (LIC) model parameters from the mapped domain reference template block and a mapped domain neighboring reconstruction template block. The one or more processors are configured to apply the LIC model parameters to motion-compensated prediction signals and decode the video data based on the application of the LIC model parameters.

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.

公开(公告)号：WO2021079008A1

公开(公告)日：2021-04-29

申请号：PCT/EP2020/080086

申请日：2020-10-26

Applicant: VALEO VISION

Inventor： ALMEHIO, Yasser

IPC: H04N19/167 ,  H04N19/115 ,  H04N19/593 ,  H04N19/98 ,  B60Q1/04 ,  F21S41/00 ,  B62J6/02 ,  G01C21/36 ,  B60Q1/00

Abstract: The invention provides a method for managing image data in an automotive lighting device (10). This method comprises the steps of providing an image pattern (1) and defining a variation pattern (2), wherein a pixel (21) of the variation pattern (2, 3) is related to the difference of luminous intensity between two pixels (11) of the image pattern (1). Afterwards, this variation pattern (2, 3) is compressed, thus creating a compressed variation pattern, which is sent to a light module (4). The invention also provides an automotive lighting device (10) for performing the steps of such a method.

公开(公告)号：WO2021079006A1

公开(公告)日：2021-04-29

申请号：PCT/EP2020/080084

申请日：2020-10-26

Applicant: VALEO VISION

Inventor： ALMEHIO, Yasser ,  EL IDRISSI, Hafid

IPC: H04N19/167 ,  H04N19/115 ,  H04N19/593 ,  H04N19/98 ,  B60Q1/04 ,  B62J6/02 ,  F21S41/00 ,  G01C21/36 ,  H04N19/119

Abstract: The invention provides a method for managing image data in an automotive lighting device (10). This method comprises the steps of providing an image pattern (1) and an alternative dataset with a data number lower than the number of pixels, wherein the alternative dataset is related to the values of luminous intensity of the pixels (11). Then, the maximum error is calculated and the alternative dataset is modified to reduce the maximum error, obtaining a modified alternative dataset. The modified alternative dataset is compressed and sent to a light module. The invention also provides an automotive lighting device (10) for performing the steps of such a method.

公开(公告)号：WO2020048790A1

公开(公告)日：2020-03-12

申请号：PCT/EP2019/072536

申请日：2019-08-22

Applicant: KONINKLIJKE PHILIPS N.V.

Inventor： VAN DER VLEUTEN, Renatus, Josephus ,  NIJLAND, Rutger ,  TICHELAAR, Johannes, Yzebrand

IPC: H04N19/98 ,  G06T5/00 ,  H04N19/162 ,  H04N19/179

Abstract: At least some applications in the total HDR video chain desire some more sophisticated approach, such as a high dynamic range video encoder (900), arranged to receive via an image input (920) an input high dynamic range image (MsterHDR) which has a first maximum pixel luminance (PB_C_H50), the encoder being arranged to receive via a metadata input (921) a master luma mapping function (FL_50t1), which luma mapping function defines the relationship between normalized lumas of the input high dynamic range image and normalized lumas of a corresponding standard dynamic range image (Im_LDR) having a maximum pixel luminance of preferably 100 nit, characterized in that the encoder further comprises a metadata input (923) to receive a second maximum pixel luminance (PB_CH), and the encoder further being characterized in that it comprises: - a HDR function generation unit (901) arranged to apply a standardized algorithm to transform the master luma mapping function (FL_50t1) into a adapted luma mapping function (F_H2hCI), which relates normalized lumas of the input high dynamic range image to normalized luminances of an intermediate dynamic range image (IDR) which is characterized by having a maximum possible luminance being equal to the second maximum pixel luminance (PB_CH); an IDR image calculation unit (902) arranged to apply the adapted luma mapping function (F_H2hCI) to lumas of pixels of the input high dynamic range image (MsterHDR) to obtain lumas of pixels of the intermediate dynamic range image (IDR); and an IDR mapping function generator (903) arranged to derive on the basis of the master luma mapping function (FL_50t1) and the adapted luma mapping function (F_H2hCI) a channel luma mapping function (F_I2sCI), which defines as output the respective normalized lumas of the standard dynamic range image (Im_LDR) when given as input the respective normalized lumas of the intermediate dynamic range image (IDR); the encoder being further characterized to have as output: the intermediate dynamic range image (IDR), as first metadata the second maximum pixel luminance (PB_CH), as second metadata the channel luma mapping function (F_I2sCI); and as third metadata the first maximum pixel luminance (PB_C_H50).

公开(公告)号：WO2018140012A1

公开(公告)日：2018-08-02

申请号：PCT/US2017/014976

申请日：2017-01-25

Applicant: BAE SYSTEMS IMAGING SOLUTIONS INC.

Inventor： DO, Hung, T. ,  MCGRATH, R., Daniel

IPC: G06T5/00 ,  H04N5/355 ,  H04N5/335 ,  H04N19/98

Abstract: An imaging array and method for using the same are disclosed The imaging array includes a plurality of pixel sensors connected to a bit line, each pixel sensor includes a photodetector that includes a photodiode, a floating diffusion node, and a buffer connected to the floating diffusion node that produces a pixel output signal having a voltage that is a monotonic function of a voltage on the floating diffusion node. Each pixel sensor also include an overflow capacitor connected to the photodiode by an overflow transfer gate that allows photocharge in excess of a predetermined charge to flow onto the overflow capacitor. The charge accumulated on the photodiode and the overflow capacitor are combined to provide an improved dynamic range for the pixel sensors.

公开(公告)号：WO2018044803A1

公开(公告)日：2018-03-08

申请号：PCT/US2017/048925

申请日：2017-08-28

Applicant: DOLBY LABORATORIES LICENSING CORPORATION

Inventor： SONG, Qing ,  KADU, Harshad ,  CHEN, Qian ,  SU, Guan-Ming

IPC: H04N19/136 ,  H04N19/98 ,  H04N19/142 ,  H04N19/179 ,  H04N19/87

CPC classification number: H04N19/136 ,  H04N19/142 ,  H04N19/179 ,  H04N19/87 ,  H04N19/98

Abstract: Real-time forward reshaping, comprising selecting a statistical sliding window that indexes with the current frame, having also, a look-back frame and a look-ahead frame, determining whether they are part of the current scene, determining a noise parameter, a luma transfer function and a luma forward reshaping function based on the luma transfer function and the noise parameter within the current scene, selecting a central tendency sliding window of the current frame and the look-back frame within the current scene, and determining a central tendency luma forward reshaping function. The chroma reshaping comprises analyzing statistics for the extended dynamic range (EDR) weights and EDR upper bounds, mapping these to standard dynamic range (SDR) weights and SDR upper bounds based on the central tendency luma forward reshaping function, determining a chroma content-dependent polynomial and a central tendency chroma forward reshaping polynomial and generating chroma MMR coefficients.

Abstract translation: 实时向前变形，包括选择与当前帧索引的统计滑动窗口，也具有回看帧和先行帧，确定它们是否是当前帧的一部分 场景，基于当前场景内的亮度传递函数和噪声参数来确定噪声参数，亮度传递函数和亮度向前变形函数，选择当前帧的中心倾向滑动窗口和 当前场景，并确定中心倾向亮度向前重塑功能。 色度重新整形包括分析扩展动态范围（EDR）权重和EDR上限的统计量，基于中心趋势亮度向前整形函数将它们映射到标准动态范围（SDR）权重和SDR上限，确定色度内容相关性 多项式和中心趋势色度正向重塑多项式并产生色度MMR系数。

公开(公告)号：WO2017201066A1

公开(公告)日：2017-11-23

申请号：PCT/US2017/032933

申请日：2017-05-16

Applicant: QUALCOMM INCORPORATED

Inventor： RUSANOVSKYY, Dmytro ,  BUGDAYCI SANSLI, Done ,  SOLE ROJALS, Joel ,  RAMASUBRAMONIAN, Adarsh Krishnan ,  KARCZEWICZ, Marta

IPC: H04N19/126 ,  H04N19/136 ,  H04N19/176 ,  H04N19/18 ,  H04N19/98

Abstract: A device for decoding video data receives the video data, determines a scaling parameter for a block of the video data; and scales the block in a video decoding loop using the scaling parameter to increase a dynamic range for luminance values of the block. A device for encoding video data partitions the video data into blocks; determines a scaling parameter for a block of the video data; and scales the block in a video encoding loop using the scaling parameter to decrease a dynamic range for luminance values of the block.

Abstract translation: 用于解码视频数据的设备接收视频数据，确定视频数据块的缩放参数; 并且使用缩放参数将该块缩放到视频解码循环中以增加该块的亮度值的动态范围。 一种用于编码视频数据的设备将视频数据分割成块; 确定视频数据块的缩放参数; 并使用缩放参数在视频编码循环中缩放块，以减小块的亮度值的动态范围。

公开(公告)号：WO2017129147A1

公开(公告)日：2017-08-03

申请号：PCT/CN2017/077167

申请日：2017-03-18

Applicant: 中兴通讯股份有限公司

Inventor： 郑喆坤 ,  于胜韬 ,  柯鹏 ,  李明 ,  吴平 ,  尚国强 ,  吴钊

IPC: H04N19/98

CPC classification number: H04N19/98

Abstract: 一种图像的编码、解码方法及装置、以及图像的编解码系统，其中，图像的编码方法包括：根据视频图像像素采样值确定调整因子；根据调整因子对视频图像进行变换处理，并对进行变换处理后的视频图像进行编码；将对调整因子进行编码得到的编码码流写入进行编码后的视频图像的编码码流中。解决了相关技术中在编码具体的HDR视频时无法充分利用量化值，以及存在量化损失缺陷的问题，达到了可以更充分的利用量化值，提高HDR视频编码的准确性，降低量化损失的效果。