Title :
A visual feedback control system for tracking and zooming a target
Author :
Hwang, Junghyun ; Ooi, Yoshiteru ; Ozawa, Shinji
Author_Institution :
Fac. of Sci. & Eng., Keio Univ., Yokohama, Japan
Abstract :
The authors describe an adaptive sensing system with tracking and zooming for a moving object in a time varying environment. Two algorithms, the close contour mating technique and the effective determination of zoom ratio by fuzzy control, are proposed for achieving the sensing system. The estimation of objective feature parameters, two-dimensional velocity and size, is based on close contour matching. First, the correspond problem is solved by using cross-correlation in projection which is abstracted from the contours of the object in the specialized difference image. Closely shifting and matching the contours eliminates the occluded contours as well as noise. To zoom the tracked object in accordance with the state of its shape or movement, fuzzy control is considered. Three sets of input membership functions, the confidence of object shape, the variance of object velocity, and the object size, are evaluated based on fuzzy rules for controlling the focus length of the sensor. Experimental results show that the proposed system is robust and valid for numerous kinds of moving objects in real scenes with a system period of 1.85 s
Keywords :
computer vision; computerised control; feedback; fuzzy control; image recognition; tracking; adaptive sensing system; close contour mating technique; correspond problem; cross-correlation; difference image; fuzzy control; objective features parameter estimation; sensor focus length; target tracking; target zooming; visual feedback control system; zoom ratio determination; Adaptive systems; Feedback control; Fuzzy control; Fuzzy sets; Noise shaping; Shape control; Size control; Target tracking; Time varying systems; Velocity control;
Conference_Titel :
Industrial Electronics, Control, Instrumentation, and Automation, 1992. Power Electronics and Motion Control., Proceedings of the 1992 International Conference on
Conference_Location :
San Diego, CA
Print_ISBN :
0-7803-0582-5
DOI :
10.1109/IECON.1992.254539