• 제어로봇시스템학회논문지
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• 제9권1호
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• pp.37-43
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• 2003

A faster autofocusing method is proposed. The searching speed of microscope camera is limited by the long focusing time due to too much sampled digital image data. The improvement of autofocusing speed based on the down sampling is discussed analytically and is proved by experiments. The anticipated aliasing is found negligible in shilling rate of focus measure.

• 한국조리학회지
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• 제24권2호
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• pp.103-111
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• 2018

The objectives of the present study were to examine the antioxidant activity of autofocusing fractions from egg white protein hydrolysates and obtain higher antioxidant peptide fraction, which could be applied to the food model system. Alkaline protease hydrolysate of egg white protein exerted higher antioxidant activities than other protein hydrolysates and were fractionated on the basis of the amphoteric nature of sample peptides by preparative isoelectric focusing without toxic solvents and reagents, which is termed autofocusing. Neutral and basic fractions showed higher 1,1-diphenyl-2-picrylhydrazyl (DPPH) radical scavenging activity than the acidic fractions. The acidic and neutral fractions showed higher hydroxyl (OH) radical scavenging activity and oxygen radical absorbance capacity (ORAC) values than the basic fractions. The acidic fractions showed higher metal chelating activity than basic fractions. Antioxidant activities of some autofocusing fractions except for ORAC showed higher compared to the crude hydrolysate. These results suggest that peptides fractions from egg white protein are effective antioxidant, and that autofocusing could be useful to increase antioxidant activity for application to food system.

• 한국정밀공학회:학술대회논문집
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• 한국정밀공학회 2006년도 추계학술대회 논문집
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• pp.1-2
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• 2006

• 광학세계
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• 통권102호
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• pp.65-69
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• 2006

VGA급에서 1.3메가, 그리고 2메가급의 휴대폰용 카메라제품이 속속 등장함에 따라 작업자의 육안검사에 의존하던 카메라모듈의 초점검사공정에서 다양한 Vision 및 소프트웨어를 이용한 자동화 설비의 개발 수요가 급증하고 있다. 당사에서는 이미 약 2년 전부터 이와 같은 시장의 추세를 예측하여 별도 변환렌즈를 통한 자동포커스 조절 시스템의 구현을 통해 메가급 이상의 다양한 휴대폰용 카메라모듈의 변화에도 유연성 있게 대처할 수 있는 Autofocusing System을 자체 개발한바 있다. 따라서 본 고에서는 이 시스템 구현을 통해 실제 양산에 적용 가능한 제품을 소개하고자 한다.

• 한국정보통신설비학회:학술대회논문집
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• 한국정보통신설비학회 2008년도 정보통신설비 학술대회
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• pp.186-189
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• 2008

In order to estimate cell images, high-performance electron microscopes are used nowadays. In this paper, we propose a new simple, fast and efficient method for real-time automatic focusing in electron microscopes. The proposed algorithm is based on the prediction-error variance, and demonstrates its feasibility by using extensive experiments. This method is fast, easy to implement, accurate, and not demanding on computation time.

• 한국전자파학회논문지
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• 제18권7호
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• pp.717-722
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• 2007

표적에 대한 레이더 영상 중의 하나인 ISAR(Inverse Synthetic Aperture Radar) 영상은 표적에 대한 전자파 산란 특성에 대한 2차원 공간 분포를 나타낸다. 이러한 ISAR 영상은 원거리에서 레이더를 이용한 표적 식별에 주로 사용된다. 본 논문에서는 움직이는 실제 항공기에 대한 ISAR 영상을 얻기 위하여, 국방과학연구소에서 제작 및 운용하고 있는 KOMSAR(Korea Miniature Synthetic Aperture Radar) 장비를 이용하여 측정을 수행하였다 이렇게 얻어진 측정된 데이터에 포함되어 있는 표적의 움직임에 의한 위상 오차를 제거하기 위하여, 엔트로피 기반 ISAR 자동 초점 기법(autofocusing technique)을 사용하였다. 실험 결과, 실제 움직이는 항공기에 대한 ISAR 영상을 성공적으로 얻을 수 있었으며, 이는 향후 레이더를 이용한 표적식별에 중요한 기술적 토대가 마련되었음을 의미한다.

• 방송공학회논문지
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• 제12권4호
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• pp.350-359
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• 2007

In this paper we present a simple, efficient method for detection of sharp digital images. Recently many digital cameras are equipped with various autofocusing functions to help users take well-focused pictures as easily as possible. However, acquired digital pictures can be further degraded by motion, limited contrast, and inappropriate amount of exposure, to name a few. In order to decide whether to process the image or not, or whether to delete it or not, reliable measure of image quality to detect sharp images from blurry ones is needed. This paper presents a blurriness/sharpness measure, and demonstrates its feasibility using extensive experiments. This method is fast and easy to implement, and accurate. Regardless of the detection accuracy, existing measures are computation-intensive. However, the proposed measure in this paper is not demanding in computation time. Needless to say, this measure can be used for various imaging applications including autofocusing and astigmatism correction.

• 한국광학회:학술대회논문집
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• 한국광학회 2004년도 제15회 정기총회 및 동계학술발표회
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• pp.58-59
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• 2004

• 한국정밀공학회지
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• 제14권9호
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• pp.22-29
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• 1997

This paper describes a three dimensional profile measurement method for sheet metal products which have flexible and porous sculptured surfaces. Shadow masks are used as measuring objects for practical implementation or this study. The shadow masks are located inside the fluorescent glasses of monitors for televisions or computers and used to prevent electron guns from interfering between pixels. Three dimen- sional surface profiles are measured by adopting a software autofocusing technique to capture focused images. The experimental results show that the method is very effecive and suitable for sheet meal prod- ucts with flexible and porous surfaces.

• 대한전자공학회:학술대회논문집
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• 대한전자공학회 1999년도 추계종합학술대회 논문집
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• pp.617-620
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• 1999

In this paper, a new autofocusing technique which is resistive to noise generated by the CCD of video cameras is proposed. In the proposed scheme, the frequency selective weighted median (FSWM) filter is utilized to estimate the degree of focus and the fast hill-climbing search (HCS) strategy is exploited to determine the best focused image. Since the FSWM filter can not only extract high frequency components from the image, but also eliminate impulsive noise, the proposed autofocusing method employing the FSWM criterion function can estimate the degree of focus precisely. Furthermore, the proposed real-time HCS algorithm enables the video camera to continuously focus on dynamic images. Experimental results demonstrate that the proposed technique outperforms existing techniques by enhancing the accuracy of the focus value of the video camera without the influence of noise.