Dolby Laboratories Patent Grants

Displaying images on local-dimming displays

Granted: February 21, 2017
Patent Number: 9576555
Displays, display components, image and video processing apparatus and related methods are described. A method for driving local-dimming displays comprises generating control values for driving pixels of a spatial light modulator from one image data component and generating control values for driving backlight elements from a second image data component. The first and second image data components may respectively comprise a tone map and a ratio image. Control values for the spatial light…

Method and system for generating a transform size syntax element for video decoding

Granted: February 21, 2017
Patent Number: 9578334
In a video processing system, a method and system for generating a transform size syntax element for video decoding are provided. For high profile mode video decoding operations, the transform sizes may be selected based on the prediction macroblock type and the contents of the macroblock. A set of rules may be utilized to select from a 4.×.4 or an 8.×.8 transform size during the encoding operation. Dynamic selection of transform size may be performed on intra-predicted macroblocks,…

Method and system for improving compressed image chroma information

Granted: February 21, 2017
Patent Number: 9578341
Methods, systems, and computer programs for improving compressed image chroma information. In one aspect of the invention, a resolution for a red color component of a color video image is used that is higher than the resolution for a blue color component of the color video image. Another aspect includes utilizing a lower or higher value of a quantization parameter (QP) for one or more chroma channels as compared to the luminance channel. Another aspect is use of a logarithmic…

Method and apparatus for voice communication based on voice activity detection

Granted: February 14, 2017
Patent Number: 9571425
Voice communication method and apparatus and method and apparatus for operating jitter buffer are described. Audio blocks are acquired in sequence. Each of the audio blocks includes one or more audio frames. Voice activity detection is performed on the audio blocks. In response to deciding voice onset for a present one of the audio blocks, a subsequence of the sequence of the acquired audio blocks is retrieved. The subsequence precedes the present audio block immediately. The subsequence…

Region sizing for macroblocks

Granted: February 14, 2017
Patent Number: 9571855
Coding techniques for a video image compression system involve improving an image quality of a sequence of two or more bi-directionally predicted intermediate frames, where each of the frames includes multiple pixels. One method involves determining a brightness value of at least one pixel of each bi-directionally predicted intermediate frame in the sequence as an equal average of brightness values of pixels in non-bidirectionally predicted frames bracketing the sequence of…

Quantum dots for display panels

Granted: February 7, 2017
Patent Number: 9564078
Techniques for rendering images directly with light conversion materials are described. In some embodiments, image data for one or more image frames is received. A light source may be controlled to emit first light to irradiate a light conversion material disposed with an image rendering surface. Second light that renders the one or more image frames may be emitted from the light conversion material. The second light emitted from the light conversion material may be excited by the first…

Audio data hiding based on perceptual masking and detection based on code multiplexing

Granted: February 7, 2017
Patent Number: 9564139
A spread spectrum data hiding for audio signals is described. A set of pseudo-random noise sequences is added to an audio signal according to a data to be embedded. A masking curve is used to shape the added noise. A transient detection step can be used to control whether a shaped noise sequence is to be added or not. Embedded information is detected by first performing a whitening step and then performing a phase-only correlation with a same set of pseudo-random noise sequences. A…

Spatial multiplexing in a soundfield teleconferencing system

Granted: February 7, 2017
Patent Number: 9565314
The present document relates to audio conference systems. In particular, the present document relates to the mapping of soundfields within an audio conference system. A conference multiplexer (110, 175, 210, 400) configured to place a first input soundfield signal (402) originating from a first soundfield endpoint (120, 170) within a 2D or 3D conference scene (300) to be rendered to a listener (301) is described. The first input soundfield signal (402) is indicative of a soundfield…

Audio processing apparatus and audio processing method

Granted: January 31, 2017
Patent Number: 9558744
An audio processing apparatus and an audio processing method are described. In one embodiment, the audio processing apparatus include an audio masker separator for separating from a first audio signal an audio material comprising a sound other than stationary noise and utterance meaningful in semantics, as an audio masker candidate. The apparatus also includes a first context analyzer for obtaining statistics regarding contextual information of detected audio masker candidates, and a…

Automatic loudspeaker polarity detection

Granted: January 31, 2017
Patent Number: 9560461
In some embodiments, a method for automatic detection of polarity of speakers, e.g., speakers installed in cinema environments. In some embodiments, the method determines relative polarities of a set of speakers (e.g., loudspeakers and/or drivers of a multi-driver loudspeaker) using a set of microphones, including by measuring impulse responses, including an impulse response for each speaker-microphone pair; clustering the speakers into a set of groups, each group including at least two…

Theater entrance

Granted: January 24, 2017
Patent Number: 9551161
The present disclosure is directed to an entrance to a theater of the type normally used to show motion pictures. The motion picture theater entrance has distinctive outer walls separating a vestibule from a lobby. The vestibule has a curved image projection wall located inside said vestibule and is connected to a viewing area by a curved walkway. The entrance also may include border lighting along the upper and or lower edges of its walls.

Echo control through hidden audio signals

Granted: January 24, 2017
Patent Number: 9552827
A method (800) for determining an estimate (215, 261) of an echo path property of an electronic device (200, 250, 300, 600). The electronic device is configured to render a total audio signal using a loudspeaker (102), and the electronic device is configured to record an echo of the rendered audio signal using a microphone (103), thereby yielding a recorded audio signal (112). The method comprises inserting (801), in an inaudible manner, an auxiliary audio signal (212) into the total…

Automatic generation of metadata for audio dominance effects

Granted: January 24, 2017
Patent Number: 9552845
Metadata comprising a set of gain values for creating a dominance effect is automatically generated. Automatically generating the metadata includes receiving multiple audio streams and a dominance criterion for at least one of the audio streams. A set of gains is computed for one or more audio streams based on the dominance criterion for the at least one audio stream and metadata is generated with the set of gains.

Workflow for content creation and guided display management of EDR video

Granted: January 24, 2017
Patent Number: 9554020
Video data with enhanced dynamic range (EDR) are color graded for a first and a second reference display with different dynamic range characteristics to generate a first color-graded output, a second color graded output, and associated first and second sets of metadata. The first color-graded output and the two sets of metadata are transmitted from an encoder to a decoder to be displayed on a target display which may be different than the second reference display. At the receiver, a…

Video compression implementing resolution tradeoffs and optimization

Granted: January 24, 2017
Patent Number: 9554132
Compression transforming video into a compressed representation (which typically can be delivered at a capped pixel rate compatible with conventional video systems), including by generating spatially blended pixels and temporally blended pixels (e.g., temporally and spatially blended pixels) of the video, and determining a subset of the blended pixels for inclusion in the compressed representation including by assessing quality of reconstructed video determined from candidate sets of the…

Method and system for illumination compensation and transition for video coding and processing

Granted: January 24, 2017
Patent Number: 9554156
Deriving illumination compensation parameters and detection of illumination dominant transitions types for video coding and processing applications is described. Illumination changes such as fade-ins, fade-outs, cross-fades, and flashes are detected. Detection of these illumination changes is then used for weighted prediction to provide for improved illumination compensation.

Method of packaging and package of fixed-temple eyewear

Granted: January 17, 2017
Patent Number: 9546031
A novel method of packaging fixed-temple eyewear includes arranging a first plurality of pairs of fixed-temple eyewear in a first arrangement with the lenses of the eyewear lying substantially in the same plane. The right temples of the eyewear are aligned along a first line and the left temples of the eyewear are aligned along a second line. The first plurality of pairs of eyewear is held in the first arrangement with a first portion of packaging material. Second and third pluralities…

Method and system for shaped glasses and viewing 3D images

Granted: January 17, 2017
Patent Number: 9547179
Shaped glasses have curved surface lenses and spectrally complementary filters disposed on the curved surface lenses configured to compensate for wavelength shifts occurring due to viewing angles and other sources. The spectrally complementary filters include guard bands to prevent crosstalk between spectrally complementary portions of a 3D image viewed through the shaped glasses. In one embodiment, the spectrally complementary filters are disposed on the curved lenses with increasing…

Methods and apparatus for detecting a repetitive pattern in a sequence of audio frames

Granted: January 17, 2017
Patent Number: 9547715
Methods and apparatus for detecting a repetitive pattern in a sequence of audio frames are described. Similarity values of a first similarity matrix with first resolution for the sequence are calculated. An adaptive threshold is estimated from the similarity values for classifying the similarity values into repetition or non-repetition. For each of one or more offsets of a second similarity matrix with second resolution higher that the first resolution, similarity values of the second…

Method and apparatus for adjusting drive values for dual modulation displays

Granted: January 17, 2017
Patent Number: 9548028
Method and apparatus are provided for determining and adjusting drive values for a display comprising light source modulation layer such as a backlight array of LED and a display modulation layer such as an LCD panel. Image regions for which any of the display modulation layer drive values are above a predetermined threshold maximum value or below a predetermined threshold minimum value are flagged. The light source modulation layer control values determined for a subsequent frame of…