公开(公告)号：US10021390B2

公开(公告)日：2018-07-10

申请号：US15608433

申请日：2017-05-30

Applicant: DOLBY LABORATORIES LICENSING CORPORATION

Inventor： Guan-Ming Su ,  Sheng Qu ,  Hubert Koepfer ,  Yufei Yuan ,  Samir Hulyalkar

IPC: H04N19/15 ,  G06F17/18 ,  H04N19/192 ,  H04N19/98 ,  H04N19/105

CPC classification number: H04N19/105 ,  G06F17/18 ,  H04N19/147 ,  H04N19/16 ,  H04N19/192 ,  H04N19/30 ,  H04N19/98 ,  H05K999/99

Abstract: Inter-color image prediction is based on multi-channel multiple regression (MMR) models. Image prediction is applied to the efficient coding of images and video signals of high dynamic range. MMR models may include first order parameters, second order parameters, and cross-pixel parameters. MMR models using extension parameters incorporating neighbor pixel relations are also presented. Using minimum means-square error criteria, closed form solutions for the prediction parameters are presented for a variety of MMR models.

公开(公告)号：US09967599B2

公开(公告)日：2018-05-08

申请号：US14786503

申请日：2014-04-07

Applicant: Dolby Laboratories Licensing Corporation

Inventor： Sheng Qu ,  Ailan Hu ,  Gopi Lakshminarayan ,  David Brooks

IPC: H04N21/235 ,  H04N21/4363 ,  H04N5/38 ,  H04N9/64 ,  G09G5/00

CPC classification number: H04N21/2353 ,  G09G5/006 ,  G09G2370/047 ,  G09G2370/12 ,  H04N5/38 ,  H04N9/646 ,  H04N21/43635

Abstract: In an embodiment, a media source combines reference code values and mapping function parameters for mapping functions into video frames originally designated to carry pixel values. The video frames are delivered to a downstream device such as a media sink in an encoded video signal. The media sink extracts the mapping function parameters for the mapping functions from the encoded video signal and applies the mapping functions as a part of display management operations to map the reference code values to the mapped pixel values appropriate for the media sink. The mapped pixel values can be used to render images as represented by the reference code values.

公开(公告)号：US09924171B2

公开(公告)日：2018-03-20

申请号：US15280822

申请日：2016-09-29

Applicant: Dolby Laboratories Licensing Corporation

Inventor： Guan-Ming Su ,  Sheng Qu ,  Samir N. Hulyalkar ,  Tao Chen ,  Walter C. Gish ,  Hubert Koepfer

IPC: H04N19/103 ,  H04N19/124 ,  H04N19/98 ,  H04N19/30 ,  H04N19/126

CPC classification number: H04N19/124 ,  H04N19/103 ,  H04N19/126 ,  H04N19/142 ,  H04N19/187 ,  H04N19/30 ,  H04N19/98

Abstract: Techniques use multiple lower bit depth (e.g., 8 bits) codecs to provide higher bit depth (e.g., 12+ bits) high dynamic range images from an upstream device to a downstream device. Multiple layers comprising a base layer and one or more enhancement layers may be used to carry video signals comprising image data compressed by lower bit depth encoders to a downstream device, wherein the base layer cannot be decoded and viewed on its own. Lower bit depth input image data to base layer processing may be generated from higher bit depth high dynamic range input image data via advanced quantization to minimize the volume of image data to be carried by enhancement layer video signals. The image data in the enhancement layer video signals may comprise residual values, quantization parameters, and mapping parameters based in part on a prediction method corresponding to a specific method used in the advanced quantization. Adaptive dynamic range adaptation techniques take into consideration special transition effects, such as fade-in and fade-outs, for improved coding performance.

公开(公告)号：US09712834B2

公开(公告)日：2017-07-18

申请号：US14488415

申请日：2014-09-17

Applicant: Dolby Laboratories Licensing Corporation

Inventor： Guan-Ming Su ,  Qian Chen ,  Peng Yin ,  Sheng Qu

IPC: H04N19/33 ,  H04N19/86 ,  H04N19/85

CPC classification number: H04N19/33 ,  H04N19/85 ,  H04N19/86

Abstract: In an embodiment, a control map of false contour filtering is generated for a predicted image. The predicted image is predicted from a low dynamic range image mapped from the wide dynamic range image. Based at least in part on the control map of false contour filtering and the predicted image, one or more filter parameters for a sparse finite-impulse-response (FIR) filter are determined. The sparse FIR filter is applied to filter pixel values in a portion of the predicted image based at least in part on the control map of false contour filtering. The control map of false contour filtering is encoded into a part of a multi-layer video signal that includes the low dynamic range image.

公开(公告)号：US09497456B2

公开(公告)日：2016-11-15

申请号：US14351647

申请日：2012-11-01

Applicant: DOLBY LABORATORIES LICENSING CORPORATION

Inventor： Guan-Ming Su ,  Sheng Qu ,  Samir N. Hulyalkar ,  Tao Chen ,  Walter C. Gish ,  Hubert Koepfer

IPC: H04N19/126 ,  H04N19/30 ,  H04N19/124 ,  H04N19/103 ,  H04N19/98

CPC classification number: H04N19/124 ,  H04N19/103 ,  H04N19/126 ,  H04N19/142 ,  H04N19/187 ,  H04N19/30 ,  H04N19/98

Abstract: Techniques use multiple lower bit depth codecs to provide higher bit depth, high dynamic range, images from an upstream device to a downstream device. A base layer and one or more enhancement layers may be used to carry video signals, wherein the base layer cannot be decoded and viewed on its own. Lower bit depth input image data to base layer processing may be generated from higher bit depth high dynamic range input image data via advanced quantization to minimize the volume of image data to be carried by enhancement layer video signals. The image data in the enhancement layer video signals may comprise residual values, quantization parameters, and mapping parameters based in part on a prediction method corresponding to a specific method used in the advanced quantization. Adaptive dynamic range adaptation techniques take into consideration special transition effects, such as fade-in and fade-outs, for improved coding performance.

Abstract translation: 技术使用多个较低位深度编解码器来提供更高的位深度，高动态范围，从上游设备到下游设备的图像。 基本层和一个或多个增强层可用于承载视频信号，其中基本层不能自己解码和观看。 低位深度输入图像数据到基层处理可以通过高级量化从较高位深度高动态范围输入图像数据生成，以最小化由增强层视频信号承载的图像数据的体积。 增强层视频信号中的图像数据可以部分地基于对应于高级量化中使用的特定方法的预测方法而包括残差值，量化参数和映射参数。 自适应动态范围适应技术考虑到特殊的过渡效应，如淡入和淡出，以提高编码性能。

公开(公告)号：US08837825B2

公开(公告)日：2014-09-16

申请号：US14198470

申请日：2014-03-05

Applicant: Dolby Laboratories Licensing Corporation

Inventor： Guan-Ming Su ,  Sheng Qu ,  Hubert Koepfer ,  Yufei Yuan ,  Samir Hulyalkar ,  Walter Gish

IPC: G06K9/36 ,  H04N19/186 ,  H04N19/105 ,  G06T5/50 ,  G06T5/00 ,  H04N19/136 ,  H04N19/36

CPC classification number: G06T5/50 ,  G06T5/009 ,  H04N1/6027 ,  H04N19/105 ,  H04N19/136 ,  H04N19/186 ,  H04N19/36

Abstract: Inter-color image prediction is based on color grading modeling. Prediction is applied to the efficient coding of images and video signals of high dynamic range. Prediction models may include a color transformation matrix that models hue and saturation color changes and a non-linear function modeling color correction changes. Under the assumption that the color grading process uses a slope, offset, and power (SOP) operations, an example non linear prediction model is presented.

Abstract translation: 彩色图像预测是基于颜色分级建模的。 预测应用于高动态范围的图像和视频信号的有效编码。 预测模型可以包括对色相和饱和度颜色变化进行建模的颜色变换矩阵和非线性函数建模颜色校正变化。 在颜色分级过程使用斜率，偏移和功率（SOP）操作的假设下，呈现示例非线性预测模型。

公开(公告)号：US10587897B2

公开(公告)日：2020-03-10

申请号：US15434699

申请日：2017-02-16

Applicant: Dolby Laboratories Licensing Corporation

Inventor： Sheng Qu ,  Peng Yin ,  Yan Ye ,  Yuwen He ,  Walter Gish ,  Guan-Ming Su ,  Yufei Yuan ,  Samir Hulyalkar

IPC: H04N19/70 ,  H04N19/159 ,  H04N19/30 ,  H04N19/50 ,  H04N19/597 ,  H04N19/98 ,  H04L29/06

Abstract: Coding syntaxes in compliance with same or different VDR specifications may be signaled by upstream coding devices such as VDR encoders to downstream coding devices such as VDR decoders in a common vehicle in the form of RPU data units. VDR coding operations and operational parameters may be specified as sequence level, frame level, or partition level syntax elements in a coding syntax. Syntax elements in a coding syntax may be coded directly in one or more current RPU data units under a current RPU ID, predicted from other partitions/segments/ranges previously sent with the same current RPU ID, or predicted from other frame level or sequence level syntax elements previously sent with a previous RPU ID. A downstream device may perform decoding operations on multi-layered input image data based on received coding syntaxes to construct VDR images.

公开(公告)号：US09872033B2

公开(公告)日：2018-01-16

申请号：US14936386

申请日：2015-11-09

Applicant: Dolby Laboratories Licensing Corporation

Inventor： Guan-Ming Su ,  Qian Chen ,  Sheng Qu

IPC: H04N19/126 ,  H04N19/186 ,  H04N19/136 ,  H04N19/179 ,  H04N19/187 ,  H04N19/90 ,  H04N19/36 ,  H04N19/142 ,  H04N19/30 ,  H04N19/132 ,  H04N19/182

CPC classification number: H04N19/186 ,  G09G5/10 ,  G09G2370/04 ,  H04N19/126 ,  H04N19/132 ,  H04N19/136 ,  H04N19/142 ,  H04N19/179 ,  H04N19/182 ,  H04N19/187 ,  H04N19/30 ,  H04N19/36 ,  H04N19/90

Abstract: An encoder receives one or more input pictures of enhanced dynamic range (EDR) to be encoded in a coded bit stream comprising a base layer and one or more enhancement layers. To encode the chroma pixels, the encoder generates a luma mask and a corresponding chroma mask. Based on generated high-clipping and low-clipping thresholds, the encoder determines the appropriate parameters to encode the chroma values in the base and enhancement layers.

公开(公告)号：US09497475B2

公开(公告)日：2016-11-15

申请号：US14687534

申请日：2015-04-15

Applicant: DOLBY LABORATORIES LICENSING CORPORATION

Inventor： Guan-Ming Su ,  Sheng Qu ,  Peng Yin

IPC: H04N7/12 ,  G06F11/30 ,  H04N19/44 ,  H04N19/503 ,  H04N19/105 ,  H04N19/14 ,  H04N19/186 ,  H04N19/154 ,  H04N19/182 ,  H04N19/33

CPC classification number: H04N19/33 ,  H04N19/105 ,  H04N19/14 ,  H04N19/154 ,  H04N19/182 ,  H04N19/186 ,  H04N19/44 ,  H04N19/503

Abstract: A sequence of visual dynamic range (VDR) images is encoded using a standard dynamic range (SDR) base layer and one or more enhancement layers. A predicted VDR image is generated from an SDR input by using a weighted, multi-band, cross-color channel prediction model. Exponential weights with an adaptable decay parameter for each band are also presented.

Abstract translation: 使用标准动态范围（SDR）基础层和一个或多个增强层对视觉动态范围（VDR）图像序列进行编码。 通过使用加权的多频带交叉颜色信道预测模型从SDR输入生成预测的VDR图像。 还给出了每个频带具有适应衰减参数的指数权重。

公开(公告)号：US20140294313A1

公开(公告)日：2014-10-02

申请号：US14353090

申请日：2012-11-01

Applicant: Dolby Laboratories Licensing Corporation

Inventor： Guan-Ming Su ,  Sheng Qu ,  Scott Daly

IPC: G06T9/00

CPC classification number: G06T9/00 ,  H04N19/124 ,  H04N19/154 ,  H04N19/176 ,  H04N19/179 ,  H04N19/182 ,  H04N19/192 ,  H04N19/46 ,  H04N19/86 ,  H04N19/98

Abstract: An encoder receives a sequence of images in extended or visual dynamic range (VDR). For each image, a dynamic range compression function and associated parameters are selected to convert the input image into a second image with a lower dynamic range. Using the input image and the second image, a residual image is computed. The input VDR image sequence is coded using a layered codec that uses the second image as a base layer and a residual image that is derived from the input and second images as one or more residual layers. Using the residual image, a false contour detection method (FCD) estimates the number of potential perceptually visible false contours in the decoded VDR image and iteratively adjusts the dynamic range compression parameters to prevent or reduce the number of false contours. Examples that use a uniform dynamic range compression function are also described.

Abstract translation: 编码器在扩展或视觉动态范围（VDR）中接收一系列图像。 对于每个图像，选择动态范围压缩函数和相关参数以将输入图像转换为具有较低动态范围的第二图像。 使用输入图像和第二图像，计算残差图像。 输入VDR图像序列使用分层编解码器进行编码，其使用第二图像作为基本层，并且从输入和第二图像导出的残差图像作为一个或多个残余层。 使用残差图像，假轮廓检测方法（FCD）估计解码的VDR图像中潜在的感知可见假轮廓的数量，并且迭代地调整动态范围压缩参数以防止或减少假轮廓的数量。 还描述了使用均匀动态范围压缩功能的示例。