Wen-Ren Yang1, Ying-Shing Shiao1, Ding-Tsair Su1 and Chau-Shing Wang This email address is being protected from spambots. You need JavaScript enabled to view it.1
1Department of Electrical Engineering, National Changhua University of Education, Chang Hua, Taiwan 500, R.O.C.
Received: August 8, 2007 Accepted: May 1, 2008 Publication Date: September 1, 2008
This paper proposes the fuzzy implementation for the lens focus, aperture and zoom control of a video camera. The spectrums of grabbed images are used to design the focus membership functions for the focus control. The gray level mean and standard deviations are used to design the aperture membership functions for the exposure control. The object sizes, moving velocities and contour confidences are used to design the zoom membership functions for zoom control. The linguistic rules are described in the form of IF…THEN… as the fuzzy implication to associate the membership functions and the consequences of the optical settings. The Max-Min composition rule is utilized to determine the output inferences. The weighted-average defuzzification is adopted to determine the lens motor control signal. The experimental results demonstrate that the proposed fuzzy controllers successfully achieve the auto focus, auto exposure, and zoom control of a video camera.
Keywords: Auto Focus, Auto Aperture, Zoom Tracking, Fast Fourier Transformation, Fuzzy Controller
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