대한전기학회:학술대회논문집 (Proceedings of the KIEE Conference)
- 대한전기학회 1997년도 추계학술대회 논문집 학회본부
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- Pages.603-605
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- 1997
일차원 웨이브렛 변환을 이용한 광학기기의 자동 초점 조절에 관한 연구
Development of a Wavelet Based Optical Instrument Autofocusing algorithm
- Park, Bong-Kil (Dept. of Electrical Eng., Yonsei Univ.) ;
- Kim, Se-Hoon (Dept. of Electrical Eng., Yonsei Univ.) ;
- Kim, Yoon-Soo (Agency for Defense Development) ;
- Park, Sang-Hui (Dept. of Electrical Eng., Yonsei Univ.)
- 발행 : 1997.11.29
초록
A new algorithm using 1-dimensional wavelet transform for autofocusing of optical instrument has been developed. Previous studies based on the conventional frequency analysis have shown that as the lens-object distance approaches the optimum value, the high frequency energy in the corresponding image shows a consistent increase. However, as conventional frequency analysis techniques hide spatial distribution of each band energy, shape information in the original signal cannot be easily utilized. In this paper, a newly devised wavelet based focus measuring scheme is presented. Unlike other frequency domain analysis techniques that simply produce "frequency-only" spectra, wavelet analysis provides a "time-frequency" localized view of a given signal. As a result, both frequency band filtering and spatial distribution filtering can easily be realized. Depending on the proposed focus quality measuring algorithm, a fast and reliable automatic focus adjustment of optical devices could be implemented.
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