Sharp Laboratories of America, Inc

Microsoft Technology Licensing, LLC

Dolby Laboratories Licensing Corporation

Sharp Kabushiki Kaisha Corporation

Meta Platforms, Inc.

Dolby Laboartories Licensing Corporation

Dolby International Ab

Shijun Sun

Shawmin Lei

Shankar Lakshmi Regunathan

Chengjie Tu

Chih-Lung Lin

Hiroyuki Katata

Louis Joseph Kerofsky

Sridhar Srinivasan

Gary Joseph Sullivan

Yongjun Wu

Zhi Zhou

Shwmin Lei

Christopher A Segall

Thomas W Holcomb

Jie Zhao

Shyam Sadhwani

Weidong Zhao

Stacey Spears

Cheng Chang

Rongzhou Shen

Gang Ji

Timothy E Onders

Daniel Schonberg

William R Sanders

Byung Tae Oh

Amy Lawson Bearman

Radhika Jandhyala

Riza Kazemi

Qian Fang

Chi-Lung Lin

Techniques and tools for encoding enhancement layer video with quantization that varies spatially and/or between color channels are presented, along with corresponding decoding techniques and tools. For example, an encoding tool determines whether quantization varies spatially over a picture, and the tool also determines whether quantization varies between color channels in the picture. The tool signals quantization parameters for macroblocks in the picture in an encoded bit stream. In some implementations, to signal the quantization parameters, the tool predicts the quantization parameters, and the quantization parameters are signaled with reference to the predicted quantization parameters. A decoding tool receives the encoded bit stream, predicts the quantization parameters, and uses the signaled information to determine the quantization parameters for the macroblocks of the enhancement layer video. The decoding tool performs inverse quantization that can vary spatially and/or between color channels.

Determining chroma quantization parameter using index and quantization parameter of spatially neighboring unit

Predicting a quantization parameter for a current unit using quantization parameters of spatially neighboring units

In one embodiment, a method includes receiving touch inputs from a user corresponding to an activation trigger for an assistant system executing on a head-mounted device at the head-mounted device, accessing signals from inertial measurement unit (IMU) sensors of the head-mounted device by the head-mounted device, determining that the user is either donning or doffing the head-mounted device by an on-device don/doff detection model and based only on the signals from the IMU sensors, and overriding the activation trigger to prevent an activation of the assistant system responsive to the received touch inputs.

Preventing false activations based on don/doff detection for assistant systems

Adaptive quantization for enhancement layer video coding

Embodiments of the present invention relate to methods and systems for ordering, communicating and applying pixel intra-prediction modes.

Methods and systems for image intra-prediction mode management

An image decoding apparatus that includes a motion compensation prediction circuit configured to conduct motion compensation prediction for each of blocks to be decoded by using the reconstructed image, an inverse transformation circuit configured to conduct inverse orthogonal transformation for the data of the blocks to be decoded, and a determination circuit configured to determine a filtering strength and whether or not to conduct filtering, with respect to each of the boundaries. In addition, the determining circuit is configured to determine filtering is conducted when at least one of the two adjacent blocks is intra-coded, and filtering is not conducted when both of the two adjacent blocks are not intra-coded, a non-zero transformation coefficient is not coded in both of the two adjacent blocks, the two adjacent blocks are predicted by the same reference frame, and an absolute value of a difference between motion vectors of the two adjacent blocks is smaller than a specified threshold value.

Adaptive filtering based upon boundary strength

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Vancouver, WA, United States of America

Shijun Sun