Qualcomm Incorporated

Ming-Chang Tsai

Yen-Chi Lee

Khaled Helmi El-Maleh

Chong U Lee

James J Wu

Yan Ye

Paul Eric Jacobs

Klein S Gilhousen

William Robert Gardner

Chienchung Chang

S Katherine Lam

Pillappakkam Bahukutumbi Srinivas

Jigneshkumar P Shah

Sony Akkarakaran

Chia-Yuan Teng

John G McDonough

Charles E Sakamaki

Randeep Singh

Prashant A Kantak

Vinayak N Chowdiah

Kanu Chadha

Tingfang Ji

David Jonathan Julian

Gwendolyn Denise Barriac

Raghuraman Krishnamoorthi

Murali Chari

Pawan Kumar Baheti

Guofang Jiao

Amal Ekbal

Gokce Dane

Sivaram Srivenkata Palakodety

Chiachi Sung

Hailiang Cai

Weihong Jing

Katherine S Lam

Ann Tsuey Jiuan Wu

Nien-Chung Feng

Karl Ni

Ric Senior

Fan Ling

This disclosure describes techniques for region-of-interest (ROI) encoding. In accordance with the techniques described herein, an encoding device may determine a temporal spatial dependency value for a candidate reference video block for inter-coding a current block in a video frame. The encoding device may compare the temporal spatial dependency value to a threshold value and select a coding mode for the current block based on the comparison. A decoding device may receive data defining a ROI as well as the temporal spatial dependency value and decode a video block in the ROI based at least in part on the temporal spatial dependency value. In this manner, the techniques of this disclosure may allow a video content viewer the ability to choose a ROI to watch.

Video encoding with temporally constrained spatial dependency for localized decoding

A repeated integral images method filters image data in only two passes, e.g., the first pass filters horizontal rows of pixels and a second pass filters vertical columns of pixels, or in a single pass. The filter performs at least one infinite impulse response (IIR) filter and at least one finite impulse response (FIR) filter on the image data. A plurality of IIR filters and FIR filters maybe performed to approximate a Gaussian filter. By minimizing the number of passes, the data flow between the processing unit and the storage unit is greatly reduced compared to conventional repeated integral images method thereby improving computation time.

Fast repeated integral images

The disclosure is directed to techniques for picture-in-picture (PIP) processing for video telephony (VT). According to the disclosed techniques, a local video communication device transmits PIP information to a remote video communication device. Using the PIP information, the remote video communication device applies preferential encoding to non-PIP regions of video transmitted to the local video communication device.

Picture-in-picture processing for video telephony

The disclosure is directed to techniques for region-of-interest (ROI) processing for video telephony (VT) applications. According to the disclosed techniques, a recipient device defines ROI information for video information transmitted by a sender device, i.e., far-end video information. The recipient device transmits the ROI information to the sender device. Using the ROI information transmitted by the recipient device, the sender device applies preferential encoding to an ROI within a video scene. ROI extraction may be applied to process a user description of a region of interest (ROI) to generate information specifying the ROI based on the description. The user description may be textual, graphical, or speech-based. An extraction module applies appropriate processing to generated the ROI information from the user description. The extraction module may locally reside with a video communication device, or reside in a distinct intermediate server configured for ROI extraction.

Region-of-interest extraction for video telephony

Techniques for encoding a phase adjustment for a feedback signal in a closed-loop transmit diversity system. In an aspect, codewords for the phase adjustments are chosen according to a variable-length prefix code. The prefix code aspect allows the codewords to be transmitted in sequence on the feedback channel without being separated by 'commas' or demarcation symbols. The variable-length aspect provides a variety of coarse and fine phase adjustment quantization step sizes to accommodate multiple different channel scenarios. In an aspect, the length of the codewords may be further optimized according to the Huffman encoding algorithm.

Efficient signaling for closed-loop transmit diversity

In general, aspects of this disclosure describe example techniques for efficient usage of the fixed data rate processing of a graphics processing unit (GPU) for a variable data rate processing. For example, the GPU may be coupled to a pixel value processing unit that receives pixel values for pixels in an image processed by the GPU. The pixel value processing unit may determine whether the pixel values are for pixels that require further processing, and store the pixel values for the pixels that are required for further processing in a buffer.

Pixel value compaction for graphics processing

Methods and systems for processing video data are described. A set of candidate motion vectors is selected from motion vectors associated with macroblocks in a first frame of video data and from motion vectors associated with macroblocks in a second frame of the video data. A statistical measure of the set is determined. The statistical measure defines a motion vector for a macroblock of interest in the second frame.

Temporal error concealment for video communications

Attributes of access terminals are employed in determining durations for erasure sequences. Transmissions from access terminals are analyzed to determine different attributes are based at least on these attributes traffic models are estimated. Those terminals whose traffic models tend towards more frequent occurrences of longer erasures are assigned longer erasure durations to improve performance in erasure sequence detection.

Method and apparatus for improving performance of erasure sequence detection

Video decoding using temporally constrained spatial dependency

A method and apparatus are disclosed for performing elastic multiplexing for shared control channels in a wireless device in a wireless communication system. The present work includes, but is not limited to, phase feedback for closed-loop transmit diversity (CL-TD) in mobile wireless communication systems. The method enhances system performance with control channel scheduling flexibility around resource conflicts such as blocking and preemption. The present work discloses an elastic multiplexing processor that is cable of carrying out the elastic multiplexing process.

Elastic multiplexing for shared control channels

An apparatus and method for estimating velocity and Doppler frequency comprising acquiring a first plurality of time-of-arrival (TOA) measurements from a first plurality of base stations at a first time; acquiring a second and a third plurality of TOA measurements from a second and third plurality of base stations at a second time and a third time; determining a plurality of line-of-sight distance measurements using the first, second and third pluralities of TOA measurements; determining a plurality of velocity estimates and a plurality of angle of arrival (AOA) estimates, using the plurality of LOS distance measurements; determining a plurality of Doppler frequency estimates using the plurality of velocity estimates and the plurality of AOA estimates; and using a processor for determining an average Doppler frequency estimate over a plurality of sectors, wherein the first, second and third pluralities of TOA measurements are acquired over the plurality of sectors.

Apparatus and method for multi-sector velocity mobile velocity and doppler estimate for synchronous communication systems

Example methods, apparatuses, and articles of manufacture are disclosed herein that may be utilized to facilitate or otherwise support RF ranging-assisted local motion sensing based, at least in part, on measuring one or more characteristics of a range between communicating devices in one or more established RF links.

RF ranging-assisted local motion sensing

The disclosure relates to techniques for video source rate control for video telephony (VT) applications. The source video encoding rate may controlled using a dual-buffer based estimation of a frame budget that defines a number of encoding bits available for a frame of the video. The dual-buffer based estimation technique may track the fullness of a physical video buffer and the fullness of the virtual video buffer. The source video encoding rate is then controlled based on the resulting frame budget. The contents of the virtual buffer depend on constraints imposed by a target encoding rate, while the contents of the physical buffer depend on constraints imposed by varying channel conditions. Consideration of physical video buffer fullness permits the video source rate control technique to be channel-adaptive. Consideration of virtual video buffer fullness permits the video source rate control technique to avoid encoding excessive video that could overwhelm the channel.

Video source rate control for video telephony

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San Diego, CA, United States of America

Ming-Chang Tsai