公开(公告)号：US20140105289A1

公开(公告)日：2014-04-17

申请号：US14116326

申请日：2012-05-11

Applicant: Dolby Laboratories Licensing Corporation

Inventor： Guan-Ming Su ,  Sheng Qu ,  Walter C. Gish ,  Zhen Li

IPC: H04N19/30

CPC classification number: H04N19/105 ,  H04N19/186 ,  H04N19/187 ,  H04N19/30 ,  H04N19/85 ,  H04N19/98

Abstract: In layered Visual Dynamic range (VDR) coding, inter-layer prediction requires several color-format transformations between the input VDR and Standard Dynamic Range (SDR) signals. Coding and decoding architectures are presented wherein inter-layer prediction is performed in the SDR-based color format, thus reducing computational complexity in both the encoder and the decoder, without compromising coding efficiency or coding quality.

Abstract translation: 在分层视觉动态范围（VDR）编码中，层间预测需要在输入VDR和标准动态范围（SDR）信号之间进行多种颜色格式转换。 提出了编码和解码架构，其中以基于SDR的颜色格式执行层间预测，从而降低编码器和解码器中的计算复杂度，而不损害编码效率或编码质量。

公开(公告)号：US10553255B2

公开(公告)日：2020-02-04

申请号：US15408262

申请日：2017-01-17

Applicant: DOLBY LABORATORIES LICENSING CORPORATION

Inventor： Robin Atkins ,  Raymond Yeung ,  Sheng Qu

IPC: G11B27/30 ,  H04N5/268 ,  H04N5/91 ,  H04N9/82 ,  G11B27/28 ,  G11B27/34 ,  H04N5/14

Abstract: Methods and systems for generating and applying scene-stable metadata for a video data stream are disclosed herein. A video data stream is divided or partitioned into scenes and a first set of metadata may be generated for a given scene of video data. The first set of metadata may be any known metadata as a desired function of video content (e.g., luminance). The first set of metadata may be generated on a frame-by-frame basis. In one example, scene-stable metadata may be generated that may be different from the first set of metadata for the scene. The scene-stable metadata may be generated by monitoring a desired feature with the scene and may be used to keep the desired feature within an acceptable range of values. This may help to avoid noticeable and possibly objectionably visual artifacts upon rendering the video data.

公开(公告)号：US10237552B2

公开(公告)日：2019-03-19

申请号：US15988937

申请日：2018-05-24

Applicant: DOLBY LABORATORIES LICENSING CORPORATION

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

IPC: H04N19/105 ,  H04N19/147 ,  H04N19/30 ,  H04N19/16 ,  H04N19/192 ,  H04N19/98 ,  G06F17/18

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：US10182235B2

公开(公告)日：2019-01-15

申请号：US15473953

申请日：2017-03-30

Applicant: Dolby Laboratories Licensing Corporation

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

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

Abstract: In a decoder, a processor extracts a control map of false contour filtering from a part of a multi-layer video signal that includes a low dynamic range image mapped from an original high-dynamic range (HDR) image. It determines one or more filter parameters for a sparse finite-impulse-response (FIR) filter, where the one or more filter parameters relate to at least in part on the control map of false contour filtering and a predicted image predicted from the low dynamic range image. It applies the sparse FIR filter to filter pixel values in a portion of the predicted image based at least in part on the control map of false contour filtering, and it reconstructs a version of the original HDR image based at least in part on the portion of the predicted image as filtered by the FIR filter.

公开(公告)号：US20180192062A1

公开(公告)日：2018-07-05

申请号：US15473953

申请日：2017-03-30

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 a decoder, a processor extracts a control map of false contour filtering from a part of a multi-layer video signal that includes a low dynamic range image mapped from an original high-dynamic range (HDR) image. It determines one or more filter parameters for a sparse finite-impulse-response (FIR) filter, where the one or more filter parameters relate to at least in part on the control map of false contour filtering and a predicted image predicted from the low dynamic range image. It applies the sparse FIR filter to filter pixel values in a portion of the predicted image based at least in part on the control map of false contour filtering, and it reconstructs a version of the original HDR image based at least in part on the portion of the predicted image as filtered by the FIR filter.

公开(公告)号：US09607658B2

公开(公告)日：2017-03-28

申请号：US14906306

申请日：2014-07-28

Applicant: DOLBY LABORATORIES LICENSING CORPORATION

Inventor： Robin Atkins ,  Raymond Yeung ,  Sheng Qu

IPC: H04N9/80 ,  G11B27/30 ,  H04N5/14 ,  H04N5/268 ,  H04N5/91 ,  G11B27/28 ,  G11B27/34 ,  H04N9/82

CPC classification number: G11B27/3027 ,  G09G5/10 ,  G09G2360/16 ,  G09G2370/04 ,  G11B27/28 ,  G11B27/34 ,  H04N5/147 ,  H04N5/268 ,  H04N5/91 ,  H04N9/8205

Abstract: Methods and systems for generating and applying scene-stable metadata for a video data stream are disclosed herein. A video data stream is divided or partitioned into scenes and a first set of metadata may be generated for a given scene of video data. The first set of metadata may be any known metadata as a desired function of video content (e.g., luminance). The first set of metadata may be generated on a frame-by-frame basis. In one example, scene-stable metadata may be generated that may be different from the first set of metadata for the scene. The scene-stable metadata may be generated by monitoring a desired feature with the scene and may be used to keep the desired feature within an acceptable range of values. This may help to avoid noticeable and possibly objectionably visual artifacts upon rendering the video data.

公开(公告)号：US09538155B2

公开(公告)日：2017-01-03

申请号：US14548906

申请日：2014-11-20

Applicant: Dolby Laboratories Licensing Corporation

Inventor： Sheng Qu ,  Samir Hulyalkar

IPC: H04N9/87 ,  H04N11/24 ,  H04N13/00 ,  H04N21/2343 ,  H04N21/434 ,  H04N21/4363 ,  G09G5/36 ,  H04N21/4402 ,  G09G3/00 ,  G09G5/00

CPC classification number: H04N9/8715 ,  G09G3/003 ,  G09G5/003 ,  G09G5/005 ,  G09G5/006 ,  G09G5/36 ,  G09G2340/0428 ,  G09G2340/10 ,  G09G2352/00 ,  G09G2370/04 ,  G09G2370/12 ,  H04N11/002 ,  H04N13/178 ,  H04N13/194 ,  H04N21/234327 ,  H04N21/4341 ,  H04N21/4344 ,  H04N21/43635 ,  H04N21/440227

Abstract: Novel methods and systems for decoding and displaying enhanced dynamic range (EDR) video signals are disclosed. To accommodate legacy digital media players with constrained computational resources, compositing and display management (DM) operations are moved from a digital media player to its attached EDR display. On a video receiver, base and enhancement video layers are decoded and multiplexed together with overlay graphics into an interleaved stream. The video and graphics signals are all converted to a common format which allows metadata to be embedded in the interleaved signal as part of the least significant bits in the chroma channels. On the display, the video and the graphics are de-interleaved. After compositing and display management operations guided by the received metadata, the received graphics data are blended with the output of the DM process and the final video output is displayed on the display's panel.

Abstract translation: 公开了用于解码和显示增强动态范围（EDR）视频信号的新方法和系统。 为了适应具有受限计算资源的传统数字媒体播放器，合成和显示管理（DM）操作从数字媒体播放器移动到其附加的EDR显示器。 在视频接收机上，将基础和增强视频层与覆盖图形一起解码和多路复用到交织流中。 视频和图形信号都被转换为通用格式，其允许将元数据嵌入交织信号中，作为色度通道中最低有效位的一部分。 在显示器上，视频和图形被解交错。 在由接收到的元数据引导的合成和显示管理操作之后，接收的图形数据与DM处理的输出混合，并且最终视频输出被显示在显示器的面板上。

公开(公告)号：US08897581B2

公开(公告)日：2014-11-25

申请号：US13706089

申请日：2012-12-05

Applicant: Dolby Laboratories Licensing Corporation

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

IPC: G06K9/36 ,  G06K9/32 ,  G06T9/00 ,  H04N19/154 ,  H04N19/80 ,  H04N19/117 ,  H04N19/17

CPC classification number: G06T9/004 ,  H04N19/117 ,  H04N19/154 ,  H04N19/17 ,  H04N19/50 ,  H04N19/80

Abstract: A visual dynamic range (VDR) coding system creates a sequence of VDR prediction images using corresponding standard dynamic range (SDR) images and a prediction function. For each prediction image, an encoder identifies one or more areas within the prediction image suitable for post-prediction filtering. For each identified post-prediction area, a post-prediction filtering mode is selected among one or more post-prediction filtering modes. The selected post-prediction filtering mode is applied to output a filtered prediction image. Information related to the post-prediction filtering areas and the selected corresponding post-prediction filtering modes may be communicated to a receiver (e.g., as metadata) for guided post-prediction filtering. Example post-prediction filtering modes that use low-pass averaging filtering or adaptive linear interpolation are also described.

Abstract translation: 视觉动态范围（VDR）编码系统使用相应的标准动态范围（SDR）图像和预测函数创建VDR预测图像序列。 对于每个预测图像，编码器识别适合于后预测滤波的预测图像内的一个或多个区域。 对于每个识别的后预测区域，在一个或多个后预测滤波模式中选择后预测滤波模式。 所选择的后预测滤波模式被应用以输出滤波预测图像。 与后预测滤波区域相关的信息和所选择的相应的后预测滤波模式可以被传送到接收机（例如，作为元数据）用于指导的后预测滤波。 还描述了使用低通平均滤波或自适应线性插值的示例性后预测滤波模式。

公开(公告)号：US08873877B2

公开(公告)日：2014-10-28

申请号：US14353090

申请日：2012-11-01

Applicant: Dolby Laboratories Licensing Corporation

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

IPC: G06K9/36 ,  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联的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。

公开(公告)号：US20130329778A1

公开(公告)日：2013-12-12

申请号：US13908926

申请日：2013-06-03

Applicant: Dolby Laboratories Licensing Corporation

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

IPC: H04N7/26

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 layer. The encoder comprises a base layer quantizer (BLQ) and an enhancement layer quantizer (ELQ) and selects parameters of the BLQ and the ELQ by a joint BLQ-ELQ adaptation method which given a plurality of candidate sets of parameters for the BLQ, for each candidate set, computes a joint BLQ-ELQ distortion value based on a BLQ distortion function, an ELQ distortion function, and at least in part on the number of input pixels to be quantized by the ELQ. The encoder selects as the output BLQ parameter set the candidate set for which the computed joint BLQ-ELQ distortion value is the smallest. Example ELQ, BLQ, and joint BLQ-ELQ distortion functions are provided.

Abstract translation: 编码器接收要编码在包括基本层和一个或多个增强层的编码比特流中的增强动态范围（EDR）的一个或多个输入图像。 编码器包括基本层量化器（BLQ）和增强层量化器（ELQ），并且通过联合BLQ-ELQ适配方法来选择BLQ和ELQ的参数，该方法为每个BLQ给出了多个用于BLQ的候选参数组 候选集合，基于BLQ失真函数，ELQ失真函数，并且至少部分地基于由ELQ量化的输入像素的数量来计算联合BLQ-ELQ失真值。 编码器选择输出BLQ参数设置计算出的关节BLQ-ELQ失真值最小的候选组。 提供了例如ELQ，BLQ和联合BLQ-ELQ失真功能。