Dolby Laboratories Patent Grants

Methods and systems for inverse tone mapping

Granted: March 28, 2017
Patent Number: 9607364
Novel methods and systems for inverse tone mapping are disclosed. A scene can be analyzed to obtain highlight detection from bright light sources and specular reflections. An inverse tone mapping curve can be calculated based on the lower dynamic range and higher dynamic range displays. Multi-scale filtering can be applied to reduce noise or artifacts.

Systems and methods for controlling dual modulation displays

Granted: March 28, 2017
Patent Number: 9607556
In one embodiment, a dual modulator display systems and methods for rendering target image data upon the dual modulator display system are disclosed where the display system receives target image data, possible HDR image data and first calculates display control signals and then calculates backlight control signals from the display control signals. This order of calculating display signals and then backlight control signals later as a function of the display systems may tend to reduce…

Power management for modulated backlights

Granted: March 28, 2017
Patent Number: 9607558
Power levels of a backlight are adjusted in a number of ways and based on a number of criteria. The adjustments result in a lower power consumption and, in some cases, may enhance audience attention to important objects in a scene. The adjustments comprise, for example, a combination of ramping down power (lowering final display brightness) in concert with corresponding compensatory LCD adjustments (increasing final display brightness). The adjustments may also include, for example,…

System and methods for generating scene stabilized metadata

Granted: March 28, 2017
Patent Number: 9607658
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…

Calculating and adjusting the perceived loudness and/or the perceived spectral balance of an audio signal

Granted: March 28, 2017
Patent Number: 9608584
The invention relates to the measurement and control of the perceived sound loudness and/or the perceived spectral balance of an audio signal. An audio signal is modified in response to calculations performed at least in part in the perceptual (psychoacoustic) loudness domain. The invention is useful, for example, in one or more of: loudness-compensating volume control, automatic gain control, dynamic range control (including, for example, limiters, compressors, expanders, etc.), dynamic…

3D glasses with RFID and methods and devices for improving management and distribution of sold commodities

Granted: March 21, 2017
Patent Number: 9600827
RFID data is utilized for billing and management of 3D glasses in a cinema theater or group of theaters. RFID pedestals identify privately owned or rented 3D glasses brought into a theater by a customer. An invoice is automatically generated billing the theater operator for the use of the 3D glasses. Usage of the glasses along with other data collected about the customers is utilized for targeted advertising (e.g., e-mails, texts, selected advertise in pre-show, etc.). The invention…

Vector noise cancellation

Granted: March 21, 2017
Patent Number: 9601133
Techniques are provided for vector noise cancellation. Different value combinations for a plurality of weighting factors may be established for a plurality of selection regions. Each value combination for the plurality of weighting factors may correspond to a different combination of a set of input signals. One or more characteristics of input signals may be used to select a particular selection region. A particular value combination of the set of weighting factors may be chosen to…

Audio playback system monitoring

Granted: March 21, 2017
Patent Number: 9602940
In some embodiments, a method for monitoring speakers within an audio playback system (e.g., movie theater) environment. In typical embodiments, the monitoring method assumes that initial characteristics of the speakers (e.g., a room response for each of the speakers) have been determined at an initial time, and relies on one or more microphones positioned in the environment to perform a status check on each of the speakers to identify whether a change to at least one characteristic of…

Audio processing method and audio processing apparatus

Granted: March 21, 2017
Patent Number: 9602943
An audio processing method and apparatus are described. In one embodiment, at least one first sub-band of a first audio signal is suppressed to obtain a reduced first audio signal with reserved sub-bands; suppressing at least one second sub-band of the at least one second audio signal to obtain at least one reduced second audio signal with reserved sub-bands; and mixing the reduced first audio signal and at least one reduced second audio signal. Alternatively, a first spatial auditory…

Method and device for improving the rendering of multi-channel audio signals

Granted: March 7, 2017
Patent Number: 9589571
Conventional audio compression technologies perform a standardized signal transformation, independent of the type of the content. Multi-channel signals are decomposed into their signal components, subsequently quantized and encoded. This is disadvantageous due to lack of knowledge on the characteristics of scene composition, especially for e.g. multi-channel audio or Higher-Order Ambisonics (HOA) content. An improved method for encoding pre-processed audio data comprises encoding the…

Telecommunications device

Granted: February 28, 2017
Patent Number: D780150

Loudness modification of multichannel audio signals

Granted: February 28, 2017
Patent Number: 9584083
Scaling, by a desired amount sm, the overall perceived loudness Lm of a multichannel audio signal, wherein perceived loudness is a nonlinear function of signal power P, by scaling the perceived loudness of each individual channel Lc by an amount substantially equal to the desired amount of scaling of the overall perceived loudness of all channels sm, subject to accuracy in calculations and the desired accuracy of the overall perceived loudness scaling sm. The perceived loudness of each…

Post-processing gains for signal enhancement

Granted: February 28, 2017
Patent Number: 9584087
A method, an apparatus, and logic to post-process raw gains determined by input processing to generate post-processed gains, comprising using one or both of delta gain smoothing and decision-directed gain smoothing. The delta gain smoothing comprises applying a smoothing filter to the raw gain with a smoothing factor that depends on the gain delta: the absolute value of the difference between the raw gain for the current frame and the post-processed gain for a previous frame. The…

Systems and methods for light field modeling techniques for multi-modulation displays

Granted: February 28, 2017
Patent Number: 9584784
Dual and multi-modulator projector display systems and techniques are disclosed. In one embodiment, a projector display system comprises a light source; a controller, a first modulator, receiving light from the light source and rendering a halftone image of said the input image; a blurring optical system that blurs said halftone image with a Point Spread Function (PSF); and a second modulator receiving the blurred halftone image and rendering a pulse width modulated image which may be…

Graphics blending for high dynamic range video

Granted: February 28, 2017
Patent Number: 9584786
A method and system for merging graphics and high dynamic range video data is disclosed. In a video receiver, if needed, video and graphics are translated first into the IPT-PQ color space. A display management process uses metadata to map the input video data and the graphics from their own color volume space into a target blending color volume space by taking into consideration the color volume space of the target display.

Adaptive reshaping for layered coding of enhanced dynamic range signals

Granted: February 28, 2017
Patent Number: 9584811
An encoder receives an input enhanced dynamic range (EDR) image to be coded in a layered representation. Input images may be gamma-coded or perceptually-coded using a bit-depth format not supported by one or more video encoders. The input image is remapped to one or more quantized layers to generate output code words suitable for compression using the available video encoders. Algorithms to determine optimum function parameters for linear and non-linear mapping functions are presented.…

Method and system for improving compressed image chroma information

Granted: February 28, 2017
Patent Number: 9584816
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…

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…