Dolby Laboratories Patent Grants

Method and apparatus for compressing and decompressing a Higher Order Ambisonics representation

Granted: August 15, 2017
Patent Number: 9736607
Higher Order Ambisonics represents three-dimensional sound independent of a specific loudspeaker set-up. However, transmission of an HOA representation results in a very high bit rate. Therefore compression with a fixed number of channels is used, in which directional and ambient signal components are processed differently. The ambient HOA component is represented by a minimum number of HOA coefficient sequences. The remaining channels contain either directional signals or additional…

Tone and gamut mapping methods and apparatus

Granted: August 8, 2017
Patent Number: 9728117
Tone and/or gamut mapping apparatus and methods may be applied to map color values in image data for display on a particular display or other downstream device. A mapping algorithm may be selected based on location and/or color coordinates for pixel data being mapped. The apparatus and methods may be configured to map color coordinates differently depending on whether or not a pixel corresponds to a light source in an image and/or has special or reserved color values.

Systems and methods for ISO-perceptible power reduction for displays

Granted: August 8, 2017
Patent Number: 9728159
Several embodiments of systems and methods are disclosed that create iso-perceptible image data from input image data. Such iso-perceptible image data may be created from Just-Noticeable-Difference (JND) modeling that leverages models from the Human Visual System (HVS). From a set of iso-perceptible image data set, an output image data may be selected, such that the chosen output image data has a less power and/or energy requirement to render than the input image data. Further, the…

Blending images using mismatched source and display electro-optical transfer functions

Granted: August 8, 2017
Patent Number: 9729801
Input video signals characterized by a source electro-optical transfer function (EOTF) are to be blended and displayed on a target display with a target EOTF which is different than the source EOTF. Given an input set of blending parameters, an output set of blending parameters is generated as follows. The input blending parameters are scaled by video signal metrics computed in the target EOTF to generate scaled blending parameters. The scaled blended parameters are mapped back to the…

Speedup techniques for rate distortion optimized quantization

Granted: August 8, 2017
Patent Number: 9729888
Techniques for selecting a coding mode for an image coding process are described. Coding modes can be selected through a coding mode transition state machine, a re-quantization process, selection of an optimal transform size, by skipping some quantization parameters, or by performing motion search.

Directed interpolation and data post-processing

Granted: August 8, 2017
Patent Number: 9729899
An encoding device evaluates a plurality of processing and/or post-processing algorithms and/or methods to be applied to a video stream, and signals a selected method, algorithm, class or category of methods/algorithms either in an encoded bitstream or as side information related to the encoded bitstream. A decoding device or post-processor utilizes the signaled algorithm or selects an algorithm/method based on the signaled method or algorithm. The selection is based, for example, on…

Percentile filtering of noise reduction gains

Granted: August 8, 2017
Patent Number: 9729965
A method of post-processing banded gains for applying to an audio signal, an apparatus to post-processed banded gains, and a tangible computer-readable storage medium comprising instructions that when executed carry out the method. The banded gains are determined by input processing one or more input audio signals. The method includes post-processing the banded gains to generate post-processed gains, generating a particular post-processed gain for a particular frequency band including…

Display, imaging system and controller for eyewear display device

Granted: August 1, 2017
Patent Number: 9720231
Several embodiments of a personal display system are disclosed that comprises modular and extensible features to affect a range of user/wearer/viewer experiences. In one embodiment, the personal display system comprises a frame; a processor capable of sending image data signals and control signals; a display; an optic system, said optic system optically coupled to said at least one display; and a set of actuators, said actuators coupled to said frame and in communication with the optic…

System for maintaining reversible dynamic range control information associated with parametric audio coders

Granted: August 1, 2017
Patent Number: 9721578
On the basis of a bitstream (P), an n-channel audio signal (X) is reconstructed by deriving an m-channel core signal (Y) and multichannel coding parameters (a) from the bitstream, where 1?m<n. Also derived from the bitstream are pre-processing dynamic range control, DRC, parameters (DRC2) quantifying an encoder-side dynamic range limiting of the core signal. The n-channel audio signal is obtained by parametric synthesis in accordance with the multichannel coding parameters and while…

Making available a sound signal for higher order ambisonics signals

Granted: August 1, 2017
Patent Number: 9723424
Audio signals are recorded with microphones receiving acoustic information from one or more directions. The corresponding audio signals can be pre-listened to in production studios. However, Higher Order Ambisonics (HOA) audio signals are matrixed in such a way that the matrixing prevents listening to the matrixed sound signals without dematrixing the matrixed sound signals. For enabling a sound engineer to listen to such a matrixed signal without full HOA decoding, an informative audio…

Bass management for audio rendering

Granted: August 1, 2017
Patent Number: 9723425
Improved methods and devices for processing low-frequency audio data are provided. A bass extraction process may involve applying low-pass filters to received audio object signals, to produce extracted low-frequency audio signals. The bass extraction process may be performed prior to a process of rendering audio objects into speaker feed signals. A bass management process may involve routing the extracted low-frequency audio signals to the one or more speakers capable of reproducing…

Method and apparatus for controlling loop filtering or post filtering in block based motion compensationed video coding

Granted: July 25, 2017
Patent Number: RE46491
Adjacent blocks are identified in an image. Coding parameters for the adjacent blocks are identified. Deblock filtering between the identified adjacent blocks is skipped if the coding parameters for the identified adjacent blocks are similar and not skipped if the coding parameters for the identified adjacent blocks are substantially different.

Reconstructing audio signals with multiple decorrelation techniques

Granted: July 25, 2017
Patent Number: 9715882
A method performed in an audio decoder for decoding M encoded audio channels representing N audio channels is disclosed. The method includes receiving a bitstream containing the M encoded audio channels and a set of spatial parameters, decoding the M encoded audio channels, and extracting the set of spatial parameters from the bitstream. The method also includes analyzing the M audio channels to detect a location of a transient, decorrelating the M audio channels, and deriving N audio…

Chromaticity translations in coding of enhanced dynamic range signals

Granted: July 25, 2017
Patent Number: 9716887
Methods to reduce chroma-related artifacts during video coding of high dynamic range images are presented. Given an input signal in a color space comprising a luma component and two chromaticity components, a processor determines the original white point chromaticity coordinates (Du, Dv) of a white point in the color space of the input signal. The input signal is translated using a chromaticity translation function to a second signal in a translated color space comprising two translated…

Method and apparatus for controlling loop filtering or post filtering in block based motion compensationed video coding

Granted: July 18, 2017
Patent Number: RE46482
Adjacent blocks are identified in an image. Coding parameters for the adjacent blocks are identified. Deblock filtering between the identified adjacent blocks is skipped if the coding parameters for the identified adjacent blocks are similar and not skipped if the coding parameters for the identified adjacent blocks are substantially different.

Metadata for use in color grading

Granted: July 18, 2017
Patent Number: 9712796
Methods and systems for color grading video content are presented. A component (e.g. a frame, a shot and/or a scene) of the video content is designated to be a master component and one or more other components of the video content are designated to be slave components, each slave component associated with the master component. A master component color grading operation is performed to the master component. For each one of the slave components, the master component color grading operation…

Compatible stereoscopic video delivery

Granted: July 18, 2017
Patent Number: 9712801
Stereoscopic images are subsampled and placed in a “checkerboard” pattern in an image. The image is encoded in a monoscopic video format. The monoscopic video is transmitted to a device where the “checkerboard” is decoded. Portions of the checkerboard (e.g., “black” portions) are used to reconstruct one of the stereoscopic images and the other portion of the checkerboard (e.g., “white” portions) are used to reconstruct the other image. The subsamples are, for example,…

Hardware efficient sparse FIR filtering in video codec

Granted: July 18, 2017
Patent Number: 9712834
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…

Method and device rendering an audio soundfield representation for audio playback

Granted: July 18, 2017
Patent Number: 9712938
The invention discloses rendering sound field signals, such as Higher-Order Ambisonics (HOA), for arbitrary loudspeaker setups, where the rendering results in highly improved localization properties and is energy preserving. This is obtained by a new type of decode matrix for sound field data, and a new way to obtain the decode matrix. In a method for rendering an audio sound field representation for arbitrary spatial loudspeaker setups, the decode matrix for the rendering to a given…

Panning of audio objects to arbitrary speaker layouts

Granted: July 18, 2017
Patent Number: 9712939
A gain contribution of the audio signal for each of the N audio objects to at least one of M speakers may be determined. Determining the gain contribution may involve determining a center of loudness position that is a function of speaker (or cluster) positions and gains assigned to each speaker (or cluster). Determining the gain contribution also may involve determining a minimum value of a cost function. A first term of the cost function may represent a difference between the center of…