• 대한의용생체공학회:학술대회논문집
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• 대한의용생체공학회 1998년도 추계학술대회
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• pp.94-95
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• 1998

We developed a digital x-ray medical imaging system using commercially available amorphous silicon image sensor plate. The image readout could be accomplished within 3.5 sec after radiation exposure and be displayed on a monitor through computer interface. This system needs not the conventional x-ray films and film processors, and also provides digital radiographic images. This system is the fastest digital radiography system developed so far, and expected to replace many of the conventional x-ray film systems or digital radiography systems.

• 한국정보기술응용학회:학술대회논문집
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• 한국정보기술응용학회 2005년도 6th 2005 International Conference on Computers, Communications and System
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• pp.173-176
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• 2005

This paper proposes a fuzzy correction algorithm that can correct the distorted medical image caused by the scanning nonlinear velocity of the Digital X-ray Scanner System (DX-Scanner) using the Multichannel Ionization Chamber (MIC). In the DX-Scanner, the scanned medical image is distorted for reasons of unsuitable integration time at the nonlinear acceleration period of the AC servo motor during the inspection of patients. The proposed algorithm finds the nonlinear motor velocity modeling through fuzzy system by clustering and reconstructs the normal medical image lines by calculating the suitable moving distance with the velocity of the motor using the modeling, acceleration time and integration time. In addition, several image processing is included in the algorithm. This algorithm analyzes exact pixel lines by comparing the distance of the acceleration period with the distance of the uniform velocity period in every integration time and is able to compensate for the velocity of the acceleration period. By applying the proposed algorithm to the test pattern for checking the image resolution, the effectiveness of this algorithm is verified. The corrected image obtained from distorted image is similar to the normal and better image for a doctor's diagnosis.

• 한국산업정보학회논문지
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• 제14권3호
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• pp.30-36
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• 2009

국내외 의료영상 정보시스템 기술의 급격한 발달과 더불어, 언제 어디서나 의료 영상을 신속하게 판독하고자 하는 다양한 연구가 이루어지고 있다. 본 논문에서는 휴대용 개인 단말기를 통해 네트워크 전송을 통한 의학 영상을 어디서나 실시간으로 판독할 수 있는 모바일 DICOM 영상 뷰어를 설계한다. 특히, 개발된 모바일 DICOM 영상 뷰어를 통해 여러 장의 의학 영상을 동시에 볼 수 있으며, 여러 장의 의학 영상 중 특정 영상만을 선택하여 볼 수도 있다. 또한 휴대용 단말기 화면 크기에 따른 불편함을 해소하기 위하여 영상 확대 기능도 개발한다.

• 대한디지털의료영상학회논문지
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• 제9권2호
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• pp.5-9
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• 2007

As developing the medical treatment image portion with the change of these times, PACS, which is able to digitalize image portion data, has a lot of data-based image data. Applying this PACS, we would like to settle down RNSXI(real-name shooting X -ray of inspector) system. We interviewed with P ACS's operators of university hospitals which is using PACS in Seoul about the present conditions whether using of RNSXI or not. And we inquired the RNSXI equipments, applying PACS database, and Interface conditions undertook to do in our hospital. All university hospitals in Seoul are set up the P ACS system. But no hospital use the RNSXI. In our hospital, we can check inspector' name or initials who exposure x-ray with the PACS Viewer by looking over equipments(CR, DR, US, MG, MR, CT) and Interface of the DICOM Header data. However, some equipments like RF and Angio can not check inspector' name or initials. Under the Film/System environment, RNSXI system has been used frequently like that inspector's signature or initial added to a patient data. Though the digital medical treatment was developed, RNSXI system was declined. It is necessary to using RNSXI system in order to improving radiologists' rights, even if it is not under the application of the medical treatment image laws. If RNSXI system use, radiologists should specialize in their major and the Repeat rate should be reduced. In environment of PACS, RNSXI system can be used by linking both the equipments and the Interface with a production enterprise of P ACS. Therefore RNSXI system applying the P ACS datebase should settle down in our medical system for being provided lots of data.

• 대한전자공학회:학술대회논문집
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• 대한전자공학회 2002년도 하계종합학술대회 논문집(4)
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• pp.109-112
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• 2002

In this paper, we propose the efficient digital watermarking scheme to transmit effectively the compressed medical image that embedded with watermarking data in mobile Internet access channel. The wireless channel error based on multiple access interference (MAI) is closely related to the length of spreading sequence in CDMA system. Also, the fixed length coded medical image with watermark bit stream can be classified by significance of source image. In the simulation, we compare the peak signal to noise ratio (PSNR) performance when the watermarked image with a simple symbol and when the watermarked image with a text file is transmitted using variable length of spreading sequences in case of limited length of spread sequence.

• 대한의용생체공학회:의공학회지
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• 제12권4호
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• pp.243-248
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• 1991

This paper described the implementation of high speed transmission fort medical image between hospitals using ISDN. The implemented system, called PC-card, can transmit datas as 144Kbps and can install in the personal computer. So, this enables to get more reliable medical image with less cost, and to service the better quality for an unurbanized area. In this system, installing in the PC system were enhanced to input from medical image system and output to the memory or display

• KSII Transactions on Internet and Information Systems (TIIS)
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• 제13권8호
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• pp.4241-4254
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• 2019

The efficiency and accuracy of handwriting measurement could be improved by adopting digital image processing. This study developed a computer-based Korean Handwriting Assessment tool. Second graders participated in this study by performing writing tasks of consonants, vowels, words, and sentences. We extracted boundary parameters for each letter using digital image processing and calculated the variables of size, size coefficient of variation (CV), misalignment, inter-letter space, inter-word space, and ratio of inter-letter space to inter-word space. Children were also administered traditional handwriting and visuomotor tests. Digital variables from image processing were correlated with these previous tests. Using these correlations, we established a three-point scoring system that computed test scores for each variable. We analyzed inter-rater reliability between the computer rater and human rater and test-retest reliability between the first and second performances. The validity was examined by analyzing the relationship between the Korean Handwriting Assessment and previous handwriting and visuomotor tests. We suggested the Korean Handwriting Assessment to measure size, size consistency, misalignment, inter-letter space, inter-word space, and space ratio using digital image processing. This Korean Handwriting Assessment tool proved to have reliability and validity. It is expected to be useful for assessing children's handwriting.

• 융합신호처리학회 학술대회논문집
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• 한국신호처리시스템학회 2003년도 하계학술대회 논문집
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• pp.110-113
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• 2003

In this paper, the multi-channel high speed data acquisition system is implemented. This high speed signal processing system for 3-D image display is applicable to the manipulation of a medical image processing, multimedia data and various fields of digital image processing. In order to convert the analog signal into digital one, A/D conversion circuit is designed. PCI interface method is designed and implemented, which is capable of transmission a large amount of data to computer. In order to, especially, channel extendibility of images acquisition, bus communication method is selected. By using this bus method, we can interface each module effectively. In this paper, 32-channel A/D conversion and PCI interface system for 3-dimensional and real-time display of the retina image is developed. The 32-channel image acquisition system and high speed data transmission system developed in this paper is applicable to not only medical image processing as 3-D representation of retina image but also various fields of industrial image processing in which the multi-point realtime image acquisition system is needed.

• 대한디지털의료영상학회논문지
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• 제3권1호
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• pp.2-5
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• 1997

• 정보보호학회논문지
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• 제21권6호
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• pp.13-20
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• 2011

오늘날 디지털 이미지의 사용범위는 웹, 산업, 의료분야 까지 많은 분야에서 사용되고 있다. 웹과 온라인 저작권의 경우 많은 연구가 진행되어왔지만, 산업용 디지털 이미지 보안에 관한 연구는 미비한 실정이다. 본 논문에서는 산업용 필름에서 사용되는 디지털 이미지 암호화 기법을 제안한다. 산업용 지적 재산권 및 산업기밀 유출을 막기 위한 산업용 이미지 보안에 적합한 이미지 암호화 기법을 구현 및 검증한다.