Automatic exposure system by fuzzy control for digital still camera

Yong-Cheng Liou; Wen-Tseng Chiang; Ye-Quang Chen; Chi-Fu Chou; Hwa-Shyong Jih; Yusheng Tim Tsai

doi:10.1117/12.175153

5 May 1994 Automatic exposure system by fuzzy control for digital still camera

Yong-Cheng Liou, Wen-Tseng Chiang, Ye-Quang Chen, Chi-Fu Chou, Hwa-Shyong Jih, Yusheng Tim Tsai

Proceedings Volume 2173, Image Acquisition and Scientific Imaging Systems; (1994) https://doi.org/10.1117/12.175153
Event: IS&T/SPIE 1994 International Symposium on Electronic Imaging: Science and Technology, 1994, San Jose, CA, United States

Abstract

The purpose of this paper is to explain the applications of automatic exposure adjusting apparatus for a digital still camera. Suppose one image has 512 X 512 pixels and the gray levels of each pixel range from 0 to 255, it will result in 256^{512 X 512} kinds of images. The next question is: how can you differentiate the proper luminance from these images? The fuzzy c-means algorithm of the fuzzy pattern recognition is used. When the degree of the membership function, representing each element in the eight orthogonal vector spaces calculated by variance criterion, is equal to 0.5, it represents neither light images nor dark images and is the proper luminance. The equation `the degree of the membership function equal to 0.5' is derived. Applying the third form of the fuzzy control involves using this equation to differentiate proper luminance of images from all images. The experimental data demonstrate satisfactory results.

Citation Download Citation

Yong-Cheng Liou, Wen-Tseng Chiang, Ye-Quang Chen, Chi-Fu Chou, Hwa-Shyong Jih, and Yusheng Tim Tsai "Automatic exposure system by fuzzy control for digital still camera", Proc. SPIE 2173, Image Acquisition and Scientific Imaging Systems, (5 May 1994); https://doi.org/10.1117/12.175153

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