The Application of human body tracking for the development of a visual interface
Abstract of thesis entitled
The Application of Human Body Tracking for the Development of a Visual Interface
for the degree of Master of Philosophy
at The University of Hong Kong
in July 2004
Human body tracking has a wide range of potential applications. This study considers its application in a visual interface between humans and computers. To be used as a visual interface, the tracking algorithm should be fast and reliable. However, there is usually a tradeoff between speed and accuracy. This makes the use of human body tracking in the development of a visual interface a challenging problem.
Based on the widely adopted framework for feature-based tracking, this study proposes a biologically inspired tracking implementation approach for developing a visual interface. The data flow in the framework and the design of each module are similar to those of primates. Under this framework, a target is detected using a color feature within a small searching region and the window? position is predicted using a visual trajectory.
The color detector described in this study is automatic and flexible. Like other state-of-the-art color detectors, the proposed detector is adaptive to the environment and is thus unaffected by changes in illumination. However, unlike other detectors, it also allows offline automatic learning for building the prior color model and adopts online adaptive color modeling by fusing several heuristics, thereby increasing both robustness and flexibility.
The motion predictor proposed in this study is model-free and reliable. Like other recently used motion predictors, it adopts a prediction-correction scheme enabling online estimation of motion to be achieved. Unlike other detectors, however, it does not assume any dynamic models. Instead, the visual trajectory is analyzed using wavelet analysis and is used to make predictions. Experiments have demonstrated that even if the visual trajectory contains
heavy noise and is highly non-linear, wavelet analysis under a bayesian framework can still give a best-fit curve and make reliable predictions.
Finally, a video-based numeric recognition system is built using the proposed framework and modules. Tests demonstrate that the proposed tracking system can track a target in real time reliably and can comprehend its motion. The proposed framework and modules are therefore suitable for developing a visual interface. Experiments have also shown that the wavelet motion features used in the system can be exploited in the field of motion recognition as well.
School:The University of Hong Kong
School Location:China - Hong Kong SAR
Source Type:Master's Thesis
Keywords:computer vision human interaction algorithms
Date of Publication:01/01/2004