• 한국콘텐츠학회논문지
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• 제8권6호
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• pp.16-25
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• 2008

현대 사회에서 빼놓을 수 없는 기기인 휴대폰 카메라를 통하여 획득한 악보를 인식함으로써 누구나 손쉽게 전문적인 악보에 대한 지식이 없어도 악보를 연주할 수 있는 시스템을 제안한다. 본 실험은 휴대폰 카메라를 이용하여 촬영한 악보 영상을 전처리과정을 통하여 분리된 심볼들을 인식한 후 미디를 구성한다. 본 논문에서는 실험을 위하여 휴대폰 카메라로 촬영한 임의의 악보 영상 11종을 사용하였다. 전처리 과정을 거친 심볼을 대상으로 제안한 방법을 통하여 인식한 결과 평균 98%의 높은 인식률을 보였다. 본 시스템을 휴대폰에 포팅하여 수행시간을 측정한 결과, 영상의 입력 후 미디 생성까지 걸리는 시간이 평균 8.63초가 소요됨을 알 수 있었다.

• 한국컴퓨터정보학회논문지
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• 제16권11호
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• pp.113-122
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• 2011

본 논문에서는 아이폰(iPhone)의 카메라와 GPS, 전화 기능을 이용하여 사용자 스스로가 실천하며 기부에 참여할 수 있는 어플리케이션을 제안한다. 아이폰의 카메라는 iOS 3.0 이상의 환경에서 Bar코드와 QR코드를 인식할 수 있어 사용자가 산 상품의 Bar코드나 QR코드를 찍어 기부에 참여하는 물건인지를 판단할 수 있다. 그리고 아이폰의 GPS를 이용하여 사용자 위치를 찾은 후 그 위치를 기반으로 사용자가 기부할 수 있는 상점, 가게 등을 쉽게 찾아갈 수 있는 내비게이션 역할을 수행 할 수 있다. 게다가, 어플리케이션 내의 전화 기능을 사용하여 ARS 연결시 전화번호를 모르더라도, 즉시 기부에 참여 할 수 있다. 위의 기능들을 내재한 제안하는 어플리케이션은 사용자가 손쉽게 직접, 간접적으로 기부에 참여할 수 있는 효과적인 어플리케이션이 될 수 있다.

• 한국소성가공학회:학술대회논문집
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• 한국소성가공학회 2008년도 추계학술대회 논문집
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• pp.363-366
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• 2008

The transcription characteristics in the molding of aspheric glass lenses for camera phone modules have been investigated experimentally. The surface topographies of both the form and the roughness were compared between the mold and the molded lens. The molded lens showed a transcription ratio of 93.4%, which is obtained by comparing the form accuracy (PV) values of the mold and the molded lens. The transcription of the roughness topography was ascertained by bearing ratio analysis.

• 한국CDE학회논문집
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• 제16권6호
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• pp.397-406
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• 2011

Since tolerance allocation in a mobile phone camera manufacturing process greatly affects production cost and reliability of optical performance, a systematic design methodology for allocating optimal tolerances is required. In this study, we proposed the tolerance optimization procedure for determining tolerances that minimize production cost while satisfying the reliability constraints on important optical performance indices. We employed Latin hypercube sampling for evaluating the reliabilities of optical performance and a function-based sequential approximate optimization technique that can reduce computational burden and well handle numerical noise in the tolerance optimization process. Using the suggested tolerance optimization approach, the optimal production cost was decreased by 30.3 % compared to the initial cost while satisfying the two constraints on the reliabilities of optical performance.

• 한국정보통신학회:학술대회논문집
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• 한국해양정보통신학회 2011년도 춘계학술대회
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• pp.320-323
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• 2011

Smart phone에 실장되는 소형 카메라 모듈의 경우, 기존 Handset과 대비하여 Non AF 상태에서의 해상도 수준의 향상에 대한 소비자의 요구가 커지고 있으며, 높은 정밀도와 동일한 반복성 및 빠른 Auto focusing speed를 요구 받고 있다. 이에 따라 기존의 Actuator mechanical position에 기반한 algorithm에서 문제가 되었던 preview(non-AF)의 안정적 해상도 보증 문제 및 속도 개선 한계 문제를 본 논문에서 개선된 algorithm으로 제안하게 되었다.

• 한국전기전자재료학회:학술대회논문집
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• 한국전기전자재료학회 2008년도 추계학술대회 논문집 Vol.21
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• pp.336-336
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• 2008

The transcription characteristics in the molding of aspheric glass lenses for camera phone modules have been investigated experimentally. The surface topographies of both the form and the roughness were compared between the mold and the molded lens. The molded lens showed a transcription ratio of 93.4%, which is obtained bycomparing the form accuracy (PV) values of the mold and the molded lens. The transcription of the roughness topography was ascertained by bearing ratio analysis.

• Design & Manufacturing
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• 제2권3호
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• pp.10-15
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• 2008

Recently, mobile-phone with camera module has an absolute majority in the released mobile-phones. For this trend, High precision of the plastic subminiature barrel which is the core part is needed significantly because the camera module of mobile-phone must have high performance. Therefore, Structural stability of the injection mold for plastic subminiature barrel has to be guaranteed. In this paper, structural analysis of injection mold for plastic subminiature barrel is performed. Finally, the deformation trend and stability of injection mold core are analyzed.

• KSII Transactions on Internet and Information Systems (TIIS)
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• 제9권12호
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• pp.5087-5102
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• 2015

Rapid popularization of smart cell phone equipped with camera has led to a number of new legal and criminal problems related to multimedia such as digital image, which makes cell phone source identification an important branch of digital image forensics. This paper proposes a classifier combination based source identification strategy for cell phone images. To identify the outlier cell phone models of the training sets in multi-class classifier, a one-class classifier is orderly used in the framework. Feature vectors including color filter array (CFA) interpolation coefficients estimation and multi-feature fusion is employed to verify the effectiveness of the classifier combination strategy. Experimental results demonstrate that for different feature sets, our method presents high accuracy of source identification both for the cell phone in the training sets and the outliers.

• 제어로봇시스템학회논문지
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• 제13권5호
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• pp.499-506
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• 2007

The tiny camera module used in a modern cellular phone requires precise assembly processes. To meet the requirement of high resolution and functionality, the number of parts used in a camera module becomes larger and larger. As the market grows rapidly, an automatic camera phone assembly process is required. However, diverse production line and short life cycle make it difficult to build an affordable assembly line. To attack this problem, a flexible and expandable lens assembly system is proposed. To save the manufacturing line set-up time, modular concept is adopted. Also, each module is designed to have intelligence to simplify the set-up process. The assembly system is built up on the standard flat-form that includes a vibration free base, air and electric supplies, and electronic controllers, etc. Furthermore, the assembly cell has the capability of handling tiny, thin, or transparent parts which are very difficult to identify without machine vision.

• Design & Manufacturing
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• 제11권3호
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• pp.13-18
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• 2017

The injection molding analysis of VCM (Voice Coil Motor) housing for smart phone cameras were performed. We conducted the analysis in terms of injection molding pressure, the formation of weld lines, flow marks, and flow patterns. The goal of the analysis was targeted for the prediction of the optimal gate locations. Because the quality of VCM housing is strongly dependent on the precise control of the camera lens by its nature, we focused on the lens guiding lanes in the VCM housing. We first calculated the maximum injection molding pressure in terms of the filled volumes. The injection molding pressure were calculated within 146MPa at about 90% volume filled. We also investigated the possibility of the occurrence of design-related defects such flow marks, weld lines. Filling patterns regarding the design of the gate locations were delineated to find the weld lines. Throughout the simulations, the final deformations of the lens guiding lanes for the VCM housing were calculated. The deformations distribute ranging from $0.5{\mu}m$ to $2.50{\mu}m$, which were used to find the optimal design of the gates.