公开(公告)号：US20140327822A1

公开(公告)日：2014-11-06

申请号：US14363861

申请日：2012-12-06

Applicant: DOLBY LABORATORIES LICENSING CORPORATION

Inventor： Walter C. Gish ,  Christopher J. Vogt

IPC: H04N9/77 ,  G06T5/00 ,  H04N9/68

CPC classification number: G06T5/007 ,  G06T2200/16 ,  G06T2207/10016 ,  G06T2207/10024 ,  G06T2207/20048 ,  G06T2207/20208 ,  H04N9/68 ,  H04N9/77 ,  H04N19/186 ,  H04N19/46 ,  H04N19/85

Abstract: A digital cinema signal is encoded to produce a resulting coded digital cinema bitstream. Decoding the resulting coded digital cinema bitstream allows backwards-compatible delivery of digital cinema content. A digital image or video signal is preprocessed to produce two normalized digital image or video signals of differing quality levels and forward and inverse mapping parameters, which relate the normalized digital image or video signals. The preprocessing can be used prior to the encoding of a digital cinema signal to enable backwards-compatible delivery of digital cinema content.

Abstract translation: 数字电影信号被编码以产生最终的编码数字电影比特流​​。 解码所产生的编码数字电影比特流​​允许数字电影内容的向后兼容传送。 对数字图像或视频信号进行预处理，以产生两个不同质量级别的归一化数字图像或视频信号，以及与归一化数字图像或视频信号相关的正向和反向映射参数。 预处理可以在数字电影信号的编码之前使用，以实现数字电影内容的向后兼容传送。

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：US20140003499A1

公开(公告)日：2014-01-02

申请号：US14017618

申请日：2013-09-04

Applicant: Dolby Laboratories Licensing Corporation

Inventor： Walter C. Gish ,  Christopher J. Vogt

IPC: H04N7/26

CPC classification number: H04N19/124 ,  H04N19/126 ,  H04N19/184 ,  H04N19/61

Abstract: The quantization parameter QP is well-known in digital video compression as an indication of picture quality. Digital symbols representing a moving image are quantized with a quantizing step that is a function QSN of the quantization parameter QP, which function QSN has been normalized to the most significant bit of the bit depth of the digital symbols. As a result, the effect of a given QP is essentially independent of bit depth a particular QP value has a standard effect on image quality, regardless of bit depth. The invention is useful, for example, in encoding and decoding at different bit depths, to generate compatible, bitstreams having different bit depths, and to allow different bit depths for different components of a video signal by compressing each with the same fidelity (i.e., the same QP).

公开(公告)号：US11941791B2

公开(公告)日：2024-03-26

申请号：US17601529

申请日：2020-04-09

Applicant: Dolby Laboratories Licensing Corporation

Inventor： Jon S. McElvain ,  Walter C. Gish ,  Gregory John Ward ,  Robin Atkins

IPC: G06T5/20 ,  G06T5/50 ,  H04N23/741

CPC classification number: G06T5/92 ,  G06T5/20 ,  G06T5/50 ,  G06T5/70 ,  H04N23/741 ,  G06T2207/20208 ,  G06T2207/20221

Abstract: A method for generating a high-dynamic-range (HDR) image includes (a) denoising a short-exposure-time image, wherein the denoising comprises applying a first guided filter to the short-exposure-time image, the guided filter utilizing a long exposure-time-image as its guide, (b) after the step of denoising, scaling at least one of the short-exposure-time image and the long-exposure-time image to place the short-exposure-time image and the long-exposure-time image on a common radiance scale, and (c) after the step of scaling, merging the short-exposure-time image with the long-exposure-time image to generate the HDR image.

公开(公告)号：US11412154B2

公开(公告)日：2022-08-09

申请号：US17274161

申请日：2019-09-05

Applicant: DOLBY LABORATORIES LICENSING CORPORATION

Inventor： Jon S. McElvain ,  Walter C. Gish ,  Jonathan Robert Miller ,  Gregory John Ward ,  Robin Atkins

IPC: H04N5/235 ,  H04N5/238 ,  H04N5/353 ,  H04N5/355 ,  H04N9/04

Abstract: An auto exposure method for a spatially-multiplexed-exposure (SME) high-dynamic-range (HDR) image sensor includes (a) retrieving raw image data from an exposure of the spatially-multiplexed-exposure high-dynamic-range image sensor, (b) preprocessing long-exposure pixel values and short-exposure pixel values of the raw image data to remove therefrom long-exposure pixel values and short-exposure pixel values failing to meet one or more quality requirements, (c) synthesizing, into an high-dynamic-range histogram, the long-exposure pixel values remaining after the step of preprocessing and the short-exposure pixel values remaining after the step of preprocessing, (d) deriving a goodness metric from the high-dynamic-range histogram, (e) adjusting at least one of the long exposure time and the short exposure time, based at least in part upon the goodness metric, and (f) outputting the at least one of the long exposure time and the short exposure time, as adjusted, to the spatially-multiplexed-exposure high-dynamic-range image sensor.

公开(公告)号：US20220198625A1

公开(公告)日：2022-06-23

申请号：US17601529

申请日：2020-04-09

Applicant: Dolby Laboratories Licensing Corporation

Inventor： Jon S. McElvain ,  Walter C. Gish ,  Gregory John Ward ,  Robin Atkins

IPC: G06T5/00 ,  G06T5/20 ,  H04N5/235 ,  G06T5/50

Abstract: A method for generating a high-dynamic-range (HDR) image includes (a) denoising a short-exposure-time image, wherein the denoising comprises applying a first guided filter to the short-exposure-time image, the guided filter utilizing a long exposure-time-image as its guide, (b) after the step of denoising, scaling at least one of the short-exposure-time image and the long-exposure-time image to place the short-exposure-time image and the long-exposure-time image on a common radiance scale, and (c) after the step of scaling, merging the short-exposure-time image with the long-exposure-time image to generate the HDR image.

公开(公告)号：US10110900B2

公开(公告)日：2018-10-23

申请号：US15889378

申请日：2018-02-06

Applicant: Dolby Laboratories Licensing Corporation

Inventor： Walter C. Gish ,  Christopher J. Vogt

IPC: H04N19/124 ,  H04N19/184 ,  H04N19/126 ,  H04N19/61

Abstract: The quantization parameter QP is well-known in digital video compression as an indication of picture quality. Digital symbols representing a moving image are quantized with a quantizing step that is a function QSN of the quantization parameter QP, which function QSN has been normalized to the most significant bit of the bit depth of the digital symbols. As a result, the effect of a given QP is essentially independent of bit depth a particular QP value has a standard effect on image quality, regardless of bit depth. The invention is useful, for example, in encoding and decoding at different bit depths, to generate compatible, bitstreams having different bit depths, and to allow different bit depths for different components of a video signal by compressing each with the same fidelity (i.e., the same QP).

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：US09794564B2

公开(公告)日：2017-10-17

申请号：US14789419

申请日：2015-07-01

Applicant: Dolby Laboratories Licensing Corporation

Inventor： Walter C. Gish ,  Christopher J. Vogt

IPC: H04N19/124 ,  H04N19/61 ,  H04N19/126 ,  H04N19/184

CPC classification number: H04N19/124 ,  H04N19/126 ,  H04N19/184 ,  H04N19/61

Abstract: The quantization parameter QP is well-known in digital video compression as an indication of picture quality. Digital symbols representing a moving image are quantized with a quantizing step that is a function QSN of the quantization parameter QP, which function QSN has been normalized to the most significant bit of the bit depth of the digital symbols. As a result, the effect of a given QP is essentially independent of bit depth a particular QP value has a standard effect on image quality, regardless of bit depth. The invention is useful, for example, in encoding and decoding at different bit depths, to generate compatible, bitstreams having different bit depths, and to allow different bit depths for different components of a video signal by compressing each with the same fidelity (i.e., the same QP).

公开(公告)号：US20170289546A1

公开(公告)日：2017-10-05

申请号：US15625192

申请日：2017-06-16

Applicant: Dolby Laboratories Licensing Corporation

Inventor： Walter C. Gish ,  Christopher J. Vogt

IPC: H04N19/124 ,  H04N19/126 ,  H04N19/184 ,  H04N19/61

CPC classification number: H04N19/124 ,  H04N19/126 ,  H04N19/184 ,  H04N19/61

Abstract: The quantization parameter QP is well-known in digital video compression as an indication of picture quality. Digital symbols representing a moving image are quantized with a quantizing step that is a function QSN of the quantization parameter QP, which function QSN has been normalized to the most significant bit of the bit depth of the digital symbols. As a result, the effect of a given QP is essentially independent of bit depth a particular QP value has a standard effect on image quality, regardless of bit depth. The invention is useful, for example, in encoding and decoding at different bit depths, to generate compatible, bitstreams having different bit depths, and to allow different bit depths for different components of a video signal by compressing each with the same fidelity (i.e., the same QP).