Qian Xu

Title: Qian Xu: Video Coding and Reliable Transmission

Introduction

Qian Xu is an inventor associated with College Station, Texas, and the Texas A&M University System. His patent work focuses on video coding methods designed to transmit and reconstruct video data over communication channels. He is credited with 2 patents.

Latest Patents

“Distributed Joint Source-Channel Coding of Video Using Raptor Codes” describes a layered video encoder and decoder. The encoder creates a reduced-quality base layer and an enhancement layer that uses energy-concentrating transforms, nested scalar quantization, and Raptor codes. At the receiving end, the decoder uses the base-layer video as side information to interpret enhancement-layer data and estimate the original video.

“Layered Wyner-Ziv Video Coding for Transmission Over Unreliable Channels” presents a method for encoding and decoding video when transmission may be unreliable. It transforms video data, quantizes it into blocks of coset indices, and encodes their bit planes using irregular repeat-accumulate encoders. A destination decoder uses side information to estimate the coset indices and reconstruct an approximation of the original video.

Career Highlights

Xu’s listed inventions address complementary challenges in video communication: efficient layered encoding and recovery of video data despite channel errors or unreliable transmission. Both approaches use side information at the decoder to help reconstruct the source video.

Collaborations

Xu’s listed coworkers include Zixiang Xiong and Vladimir M. Stanković. His patent work is associated with the Texas A&M University System.

Conclusion

Qian Xu’s patents explore layered video coding and channel-resilient reconstruction, with the goal of enabling reliable recovery of video transmitted over communication networks.