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CCM 테스트핸들러의 자동초점조절을 위한 퍼지탐색 방법
권혁중(Hyuk-Joong Kwon),윤희상(Hee-Sang Yoon),박태형(Tae-Hyoung Park) 대한전기학회 2006 대한전기학회 학술대회 논문집 Vol.2006 No.10
We propose a new-focusing method for test handlers of compact camera module (CCM), The MMD (max-min difference) method is applied to calculate the focus value Quickly considering the noisy output of CCM. Also, the fuzzy search method is applied to find the maximum focus value effectively. We design a fuzzy processor to control the lens position by focus values and brightness values, which improves the focusing performance in the sense of speed and processor memory. The proposed method is implemented by computer program and installed at the CCM test handler machines. The simulation results are presented to verify the usefulness of the proposed method.
권혁중(Hyuk-Joong Kwon),박태형(Tae-Hyoung Park) 제어로봇시스템학회 2009 제어·로봇·시스템학회 논문지 Vol.15 No.5
We propose an automatic inspection system for hologram with multiple patterns. The system hardware consists of illuminations, camera, and vision processor. Multiple illuminations using LEDs are arranged in different directions to acquire each image of patterns. The system software consists of pre-processing, pattern generation, and pattern matching. The acquired images of input hologram are compared with their reference patterns by developed matching algorithm. To compensate for the positioning error of input hologram, reference patterns of hologram for different position should be generated in on-line. We apply a frequency transformation based CGH(computer-generated hologram) method to generate reference images. For the fast pattern matching, we also apply the matching method in the frequency domain. Experimental results for hologram of Korean currency are then presented to verify the usefulness of proposed system.
서혜영(Hye-Yeong Seo),권혁중(Hyuk-Joong Kwon),이구열(Gu-Youl Lee),박태형(Tae-Hyoung Park) 대한전기학회 2007 대한전기학회 학술대회 논문집 Vol.2007 No.10
위폐 판별을 위한 홀로그램 광학 검사 시스템을 제안한다. 이 시스템은 홀로그램의 표준패턴을 생성을 CGH(Computer Generated Holoram)방법에 근거한 주파수 변환을 적용하고, 조영각도에 따라 홀로그램 이미지를 정확하게 획득하여 특성에 적합한 홀로그램 표준패턴을 생성 하게 된다. 생성한 표준패턴과 실제 영상과의 패턴매칭을 위해 패턴매칭알고리즘을 적용하여 위폐를 판별하는 검사시스템이다.