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http://dx.doi.org/10.6109/jkiice.2007.11.2.257

Auto Exposure Control System using Variable Time Constants  

Kim, Hyun-Sik (동아대학교 전자공학과)
Lee, Sung-Mok (동아대학교 전자공학과)
Jang, Won-Woo (동아대학교 전자공학과)
Ha, Joo-Young (동아대학교 전자공학과)
Kim, Joo-Hyun (동아대학교 전자공학과)
Kang, Bong-Soon (동아대학교 전자공학과)
Lee, Gi-Dong (동아대학교 전자공학과)
Publication Information
Journal of the Korea Institute of Information and Communication Engineering / v.11, no.2, 2007 , pp. 257-264 More about this Journal
Abstract
In order to obtain a fine picture, a camera has many convenient functions. Its representative functions are Auto Focus(AF), Auto White Balance(AWB) and Auto Exposure(AE). In this paper, we present the new algorithm of Auto Exposure control system, one of its useful functions The proposed algorithm of Auto Exposure control system is based on IIR Filter with Variable Time Constant. First, in order to establish the standards of exposure control, we compare change of the picture luminance with luminance of an object in the Zone system. Second, we make an ideal characteristic graph of luminance by using the results. Finally, we can find the value of the right exposure by comparing an ideal characteristic graph of the luminance with the value of the current expose of a scene. We can find an appropriate exposure as comparing the ideal characteristic graph of the luminance with current exposure of a scene. In order to find a suitable exposure state, we make use of IIR Filter instead of a conventional method using micro-controller. In this paper, the proposed system has therefore simple structure, we use it for compact image sensor module used in the handheld device.
Keywords
Auto Exposure; Zone system; Image Sensor Module; IIR Filter;
Citations & Related Records
Times Cited By KSCI : 1  (Citation Analysis)
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