• Activity Analysis, Summarization, and Visualization for Indoor Human Activity Monitoring 

    Zhou, Zhongna; Chen, Xi; Chung, Yu-Chia, 1979-; He, Zhihai, 1973-; Han, Tony X.; Keller, James M. (IEEE, 2008-11)
    In this work, we study how continuous video monitoring and intelligent video processing can be used in eldercare to assist the independent living of elders and to improve the efficiency of eldercare practice. More ...
  • Adaptive Critic Design for Energy Minimization of Portable Video Communication Devices 

    Sun, Zhao; Chen, Xi; He, Zhihai, 1973- (IEEE, 2008-08)
    Portable video communication devices operate on batteries with limited energy supply. However, video compression is computationally intensive and energy-demanding. Therefore, one of the central challenging issues in ...
  • Adaptive Silhouette Extraction and Human Tracking in Complex and Dynamic Environments 

    Chen, Xi; He, Zhihai, 1973-; Anderson, Derek T., 1979-; Keller, James M.; Skubic, Marge (IEEE, 2006-10)
    Extracting a human silhouette from an image is the enabling step for many high-level vision processing tasks, such as human tracking and activity analysis. Although there are a number of silhouette extraction and human ...
  • Adaptive Silhouette Extraction In Dynamic Environments Using Fuzzy Logic 

    Chen, Xi; He, Zhihai, 1973-; Keller, James M.; Anderson, Derek T., 1979-; Skubic, Marge (IEEE, 2006-07)
    Extracting a human silhouette from an image is the enabling step for many high-level vision processing tasks, such as human tracking and activity analysis. In a previous paper, we addressed some of the challenges in ...
  • Automated Estimation of Elder Activity Levels from Anonymized Video Data 

    Harvey, Nicholas M.; Zhou, Zhongna; Keller, James M.; Rantz, Marilyn J.; He, Zhihai, 1973- (IEE, 2009-09)
    Significant declines in quality of life for elders in assisted living communities are typically triggered by health events. Given the necessary information, such events can often be predicted, and thus, be avoided or reduced ...
  • Energy Minimization of Portable Video Communication Devices Based on Power-Rate-Distortion Optimization 

    He, Zhihai, 1973-; Cheng, Wenye; Chen, Xi (IEEE, 2008-05)
    Portable video communication devices operate on batteries with limited energy supply. However, video compression is computationally intensive and energy-demanding. Therefore, one of the central challenging issues in ...
  • Energy-Aware Portable Video Communication System Design for Wildlife Activity Monitoring 

    He, Zhihai, 1973-; Eggert, Jay; Cheng, Wenye; Zhao, Xiwen Owen; Millspaugh, Joshua J.; Moll, Remington James, 1983-; Beringer, Jeff; Sartwell, Joel (IEEE, 2008)
    In this paper, we introduce our recent research and development effort on energy-efficient portable video communication system design for wildlife activity monitoring. The capability of seeing what an animal sees in the ...
  • Fine-Granularity Transmission Distortion Modeling for Video Packet Scheduling Over Mesh Networks 

    Zhang, Yongfei; Qin, Shiyin; He, Zhihai, 1973- (IEEE, 2010-01)
    Packet scheduling is a critical component in multi-session video streaming over mesh networks. Different video packets have different levels of contribution to the overall video presentation quality at the receiver side. ...
  • Joint Source Channel Rate-Distortion Analysis for Adaptive Mode Selection and Rate Control in Wireless Video Coding 

    He, Zhihai, 1973-; Cai, Jianfei; Chen, Chang Wen, 1959- (IEEE, 2002-06)
    In this paper, we first develop a rate-distortion (R-D) model for DCT-based video coding incorporating the macroblock (MB) intra refreshing rate. For any given bit rate and intra refreshing rate, this model is capable of ...
  • Lossless Image Compression Using Super-Spatial Structure Prediction 

    Zhao, Xiwen Owen; He, Zhihai, 1973- (IEEE, 2010-04)
    We recognize that the key challenge in image compression is to efficiently represent and encode high-frequency image structure components, such as edges, patterns, and textures. In this work, we develop an efficient ...
  • Lowpass Filtering of Rate-Distortion Functions for Quality Smoothing in Real-Time Video Communication 

    He, Zhihai, 1973-; Zeng, Wenjun, 1967-; Chen, Chang Wen, 1959- (IEEE, 2005)
    In variable-bit-rate (VBR) video coding, the video is pre-processed to collect sequence-level statistics, which are used for global bit allocation in the actual encoding stage to obtain a smoothed video presentation ...
  • Peak Transform for Efficient Image Representation and Coding 

    He, Zhihai, 1973- (IEEE, 2007-07)
    In this work, we introduce a nonlinear geometric transform, called peak transform (PT), for efficient image representation and coding. The proposed PT is able to convert high-frequency signals into low-frequency ones, ...
  • Power-Rate-Distortion Analysis for Wireless Video Communication under Energy Constraints 

    He, Zhihai, 1973-; Liang, Yongfang; Chen, Lulin; Ahmad, Ishfaq; Wu, Dapeng (IEEE, 2004)
    Mobile devices performing video coding and streaming over wireless and pervasive communication networks are limited in energy supply. To prolong the operational lifetime of these devices, an embedded video encoding system ...
  • A Real-time System for In-home Activity Monitoring of Elders 

    Zhou, Zhongna; Dai, Wenqing, 1984-; Eggert, Jay; Giger, Jarod T.; Keller, James M.; Rantz, Marilyn J.; He, Zhihai, 1973- (IEEE, 2009-09)
    In this paper, we propose a real-time system for in-home activity monitoring and functional assessment for elder care. We describe the development of the whole system which could be used to assist the independent living ...
  • Recognizing Falls from Silhouettes 

    Anderson, Derek T., 1979-; Keller, James M.; Skubic, Marge; Chen, Xi; He, Zhihai, 1973- (IEEE, 2006-08)
    A major problem among the elderly involves falling. The recognition of falls from video first requires the segmentation of the individual from the background. To ensure privacy, segmentation should result in a silhouette ...
  • Reliability Analysis for Global Motion Estimation 

    Chung, Yu-Chia, 1979-; He, Zhihai, 1973- (IEEE, 2009-11)
    Global motion estimation (GME) is the enabling step for many important video exploitation tasks. In this work, we focus on indirect GME methods which have low computational complexity. Typically, an indirect GME method ...
  • Resource Allocation and Performance Analysis of Wireless Video Sensors 

    He, Zhihai, 1973-; Wu, Dapeng (IEEE, 2006-05)
    Wireless video sensor networks (WVSNs) have been envisioned for a wide range of important applications, including battlefield intelligence, security monitoring, emergency response, and environmental tracking. Compared to ...
  • Subgraphs Matching-Based Side Information Generation for Distributed Multiview Video Coding 

    Xiong, Hongkai; Lv, Hui; Zhang, Yongsheng; Song, Li; He, Zhihai, 1973-; Chen, Tsuhan, 1965- (EURASIP Journal on Advances in Signal Processing, 2009)
    We adopt constrained relaxation for distributed multiview video coding (DMVC). The novel framework integrates the graphbased segmentation and matching to generate interview correlated side information without knowing the ...
  • Technology for Successful Aging 

    Tyrer, Harry W.; Alwan, Majd; Demiris, George; He, Zhihai, 1973-; Keller, James M.; Skubic, Marge; Rantz, Marilyn J. (IEEE, 2006-08)
    With our partners at the University of Virginia we are developing a system of sensors, to monitor the activity of seniors in their residences. We measure motion, footfalls, sleep and restlessness, we have stove sensors and ...
  • TigerPlace, a State-Academic-Private Project to Revolutionize Traditional Long Term Care 

    Rantz, Marilyn J.; Porter, Rosemary T., 1944-; Cheshier, Debra; Otto, Donna; Servey, Charles H.; Johnson, Rebecca A. (Rebecca Ann); Aud, Myra A., 1947-; Skubic, Marge; Tyrer, Harry W.; He, Zhihai, 1973-; Demiris, George; Alexander, Gregory Lynn, 1961-; Taylor, Gene (Taylor & Francis, 2008)
    The Aging in Place Project at the University of Missouri (MU) required legislation in 1999 and 2001 to be fully realized. An innovative home health agency was initiated by the Sinclair School of Nursing specifically to ...