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고우석(Woo Seok Ko),예상헌(Sang Heon Ye),곽윤근(Yoon Keun Kwak),김수현(Soo Hyun Kim) Korean Society for Precision Engineering 2008 한국정밀공학회지 Vol.25 No.2
This paper proposes a new method for measuring the power of spherical and cylindrical lens with 6 points light source, which is composed of a LED and six holes, and magnification ellipse fitting algorithm. Each measured diagonal length of 6 points light source is determined by the target lens power. After finding the center position of each light poind with threshold method, 3 axis-diagonal lengths were calculated. The long axis and short axis power of cylindrical len can be calculated by using magnification ellipse fitting algorithm with the magnification relationships between the initial diagonal lengths and the measured diagonal lengths changed by lens power.