Dolby Laboratories Licensing Corporation

Dolby International Ab

David Brooks

Tao Chen

Guan-Ming Su

Samir N Hulyalkar

Sheng Qu

Klaas Heinrich Schueuer

Satoshi Teshigawara

Peng Yin

Robin Atkins

Jon S McElvain

Jaclyn Anne Pytlarz

Qian Chen

Gopi Lakshminarayanan

Robert Wanat

Jon Scott Mcelvain

Gopi Lakshminarayan

Ailan Hu

Input scene images are captured from an original scene. The input scene images may be represented in an input color space. The input scene images are converted into color-space-converted scene images in one of an LMS color space, an ICtCp color space, etc. Scene light levels represented in the color-space-converted scene images are mapped, based at least in part on an optical transfer function, to mapped light levels. A tone mapping is applied to the mapped light levels to generate corresponding display light levels to be represented in display images. The display images may be rendered on a target display.

Perceptually preserving scene-referred contrasts and chromaticities

In a method to reconstruct a high dynamic range video signal, a decoder receives a base layer standard dynamic range video signal, an enhancement layer video signal, and a metadata bitstream for a reference processing unit. A decoder reconstructs a high-dynamic range video output signal based on the base layer video signal, the enhancement layer video signal, and the data syntax and metadata specified by the metadata bitstream.

Layered representation and delivery of high dynamic range video

In a method to code and transmit scalable HDR video signals, HDR signals are processed and encoded in the IPT-PQ color space to generate a base layer at reduced spatial resolution and/or dynamic range, and an enhancement layer with a residual signal. A signal reshaping block before the base layer encoder allows for improved coding of HDR signals using a reduced bit depth. A decoder can use a BL decoder and backward reshaping to generate a decoded BL HDR signal at a reduced dynamic range and/or spatial resolution, or it can combine the decoded BL HDR signal and the EL stream to generate a decoded HDR signal at full dynamic range and full resolution.

Video coding and delivery with both spatial and dynamic range scalability

In a method to reconstruct a high dynamic range video signal, a decoder receives a base layer standard dynamic range video signal, an enhancement layer video signal, a metadata bitstream for a reference processing unit and a CRC code related to the metadata. A decoder reconstructs a high-dynamic range video output signal based on the base layer video signal, the enhancement layer video signal, and the data syntax and metadata specified by the metadata bitstream.

A processor for video coding receives a full-frame rate (FFR) HDR video signal and a corresponding FFR SDR video signal. An encoder generates a scalable bitstream that allows decoders to generate half-frame-rate (HFR) SDR, FFR SDR, HFR HDR, or FFR HDR signals. Given odd and even frames of the input FFR SDR signal, the scalable bitstream combines a base layer of coded even SDR frames with an enhancement layer of coded packed frames, where each packed frame includes a downscaled odd SDR frame, a downscaled even HDR residual frame, and a downscaled odd HDR residual frame. In an alternative implementation, the scalable bitstream combines four signals layers: a base layer of even SDR frames, an enhancement layer of odd SDR frames, a base layer of even HDR residual frames and an enhancement layer of odd HDR residual frames. Corresponding decoder architectures are also presented.

Backward-compatible HDR codecs with temporal scalability

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.

Transmitting display management metadata over HDMI

Growing community of inventors

Mountain View, CA, United States of America

David Brooks