디지털 카메라의 효율적 초접사 영상을 얻기 위한 LED 조명 기구의 개발과 피부과적 응용 : The development of LED illuminators for efficient super-macro mode images with digital camera and their dermatological applications
- 발행기관 고려대학교 대학원
- 발행년도 2004
- 학위명 박사
- 학과 대학원:의학과 피부과학 전공
- 식별자(기타) DL:000014914202
- 서지제어번호 000045199408
초록/요약
Background: Even though recent digital cameras have powerful macro capability, flashed macro photographs are not always satisfactory. Light emitting diode (LED), a kind of semiconductor product, has many advantages such as low electricity consumption, minimal heat dissipation, resistance to hit, prompt on-and-off, compact size and durability. Adjoining the leading technologies of digital camera and LED would improve the image quality of dermatological conditions or diseases. In 'micro-studio', the tiny space comprised of the objective, digital camera, and illuminator, user can modify or replace the LED lights of illuminator for more representative and efficient images. Objective: The aim of this study was to develop LED illuminators for digital photography suitable for investigating the skin, and enhance the methods to understand the digital skin images especially in colorimetric ways. Methods: We devised LED illuminators of several different light characteristics to acquire various super-macro digital images. The reference CIELAB values of color chart recorded with spectrophotometer were compared statistically with computed CIELAB values from digital images obtained using LED illuminator in order to find equations for real CIELAB values. To confirm the dermatological usability and diagnostic value, we applied the LED illuminators and digital camera on the common dermatological conditions such as acne, pigmentary change and erythema, etc. Results: The images obtained with LED illuminator were more reproducible. Regression analysis using simple linear regression model made the conversion equations that can predict the real CIELAB values. For the colorimetric purpose, manual mode images obtained with LED illuminator were preferable. It was possible to quantify the visible changes of the skin in colorimetric ways by introducing the methods devised in this study. The individual disease showed characteristic images according to the LED illuminator used. Concl
more목차
I.서론 1
II. 연구 재료 및 방법 3
1.연구 재료 및 대상 3
2.연구 방법 6
III. 연구결과 25
1.조명기구와 디지털 카메라 25
2.영상의 재현성 26
3. 색채분석 30
4. 피부질환에 대한 응용 37
IV. 고찰 50
V. 결론 56
VI. 참고문헌 58
사진부도 63
