• 한국통신학회논문지
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• 제35권12C호
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• pp.1010-1019
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• 2010

This article presents a PDE-based interpolation algorithm to effectively reproduce high resolution imagery. Conventional PDE-based interpolation methods can produce sharp edges without checkerboard effects; however, they are not interpolators but approximators and tend to weaken fine structures. In order to overcome the drawback, a texture enhancement method is suggested as a post-process of PDE-based interpolation methods. The new method rectifies the image by simply incorporating the bilinear interpolation of the weakened texture components and therefore makes the resulting algorithm an interpolator. It has been numerically verified that the new algorithm, called the PDE-based image interpolator (PII), restores sharp edges and enhances texture components satisfactorily. PII outperforms the PDE-based skeleton-texture decomposition (STD) approach. Various numerical examples are shown to verify the claim.

• 대한전자공학회:학술대회논문집
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• 대한전자공학회 2005년도 추계종합학술대회
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• pp.481-484
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• 2005

Inherent opportunities on research for restoring high resolution image from low resolution images are increasing in these days. Super resolution image reconstruction is the process of combining multiple low resolution images to form a higher resolution one. To achieve super resolution reconstruction, proper observation model which is based on subpixel shift information is required. In this context, the importance of the subpixel registration cannot be estimated because subpixel shift information cannot be obtained from original image. This paper presents a regularized adaptive super resolution reconstruction method based on phase correlated subpixel registration, where the Constrained Least Squares(CLS) Restoration is adopted as a post process.

• 대한산업공학회지
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• 제41권3호
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• pp.267-274
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• 2015

In the semiconductor manufacturing post-FAB process, predicting a package test result accurately in the wafer testing phase is a key element to ensure the competitiveness of companies. The prediction of package test can reduce unnecessary inspection time and expense. However, an analysing method is not sufficient to analyze data collected at wafer testing phase. Therefore, many companies have been using a summary information such as a mean, weighted sum and variance, and the summarized data reduces a prediction accuracy. In the paper, we propose an analysis method for Wafer Map Image collected at wafer testing process and conduct an experiment using real data.

• 한국농업기계학회:학술대회논문집
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• 한국농업기계학회 1996년도 International Conference on Agricultural Machinery Engineering Proceedings
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• pp.792-801
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• 1996

A thinning algorithm -based image analysis technique was developed to measure corn root lengths. The root length measurement method was evaluated by comparing thread lengths measured by the image analysis system with actual thread lengths. The length measurement method accurately estimated actual thread lengths (less than 2% calculated error). Also, a rapid root length density measurement procedure, which utilizes the above root length measurement method, was developed to estimate corn root length density without washing the roots. Root length densities estimated from the cut soil surface of core samples taken from the field were paired with the root length densities determined from washed roots from the same soil core sample. A linear relationship between these two values was expected and was found. Eliminating the root washing procedure reduces the time required for measuring corn root length density substantially.

• 한국정보통신학회논문지
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• 제8권7호
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• pp.1464-1468
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• 2004

본 논문은 그레이 영상을 컬러영상으로 변환하고 컬러농도를 변환하여 출력영상을 향상시킨 연구이다. RGB 컬러성분을 추출하기 위한 의사컬러링은 2D고속웨이브릿 변환(FWT)에 의한 필터뱅크 재배열을 적용하고 후처리에서 각각의 모노컬러는 노이즈제거와 영상향상을 위해 이산 컬러농도변환(CIT)을 적용한다. 실험결과 출력영상은 일반 웨이블릿 변환 적용보다 PSNR 30dB이상 개선된다.

• 한국멀티미디어학회:학술대회논문집
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• 한국멀티미디어학회 2002년도 춘계학술발표논문집(상)
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• pp.315-319
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• 2002

The study on shilla monumental inscription has been accomplished by many historians. However, the research on segmentation of monumental inscription image using digital image processing technique is not sufficient. The preprocessing using computer is needed for accurate interpretation of history. In this paper, A morphological filtering using directional information is presented. Directional filtering is effective in reducing noises and preserving edges. The opening and closing operations in the 1st stage are performed for the pixel is aligned to the vertical, horizontal and two diagonal directions. The Opening operation supresses the positive impulse noise while the closing operation the negative ones. Then Directional filter and post-processing are applied to the image. Experimental result shows outstanding performance for interpretation.

• 디지털융복합연구
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• 제13권12호
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• pp.291-301
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• 2015

본 연구는 피학대 아동을 위한 중재방법으로 미술치료를 실시하였으며 미술치료전문가와 아동학전문가가 공동으로 참여하여 미술활동이 아동 행동에 미치는 영향을 파악하고자 하는 목적에서 시도되었다. 연구대상자는 00시 00그룹 홈 초등학생 4명으로 2013년 9월부터 2014년 8월까지 주 1회 60분간 48회기 적용하였다. 미술치료효과를 분석하기 위해 연구자들은 매 회기마다 치료적 목표와 함께 대상자들의 정서적 반응과 태도 행동들을 기록하였고 행동변화에 대한 타당도검증을 위해 CDI, TAIC, SAIC, 자아상척도 검사를 실시하였다. 척도는 사전측정(2013년 9월)과 사후측정(2014년8월)하였다. 척도의 신뢰도검사를 위해 SPSS 21.0프로그램을 사용하였다. 연구문제에 대한 결과는 다음과 같다. 첫째, 학대받은 아동들은 작품에서 그들의 정서상태를 표현했고 행동이 변화하였고 친구관계가 향상되었다. 둘째, CDI, STAIC(TAIC, SAIC)서 우울과 불안에 대한 사후검사결과가 사전 검사결과보다 낮았다. 셋째, 자아상 검사결과 사후검사결과가 사전검사결과보다 높았다. 즉 아동들은 충동적 행동이 감소했고 가족, 친구들과 우호적 관계를 유지하였다. 위탁양육자는 아동들을 잘 이해할 수 있었고 그래서 양육의 어려움이 감소하였다.

• 방송공학회논문지
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• 제16권3호
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• pp.439-447
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• 2011

본 논문에서는 영화 후반 제작 단계의 편집 및 시각특수효과(Visual Effects; VFX) 과정 사이에서 효율적인 변환 작업을 위한 eXtensible MarkUp Language (XML) 기반 메타데이터의 활용 방법을 제안한다. 국내 영화의 후반 작업 단계에서 편집과정으로부터 시각특수효과과정으로 데이터를 제공할 때 Cineon DPX 혹은 TGA와 같은 영상 시퀀스 형태의 작업 방식을 취한다. 이러한 방식은 결과적으로 렌더링 과정을 두 번을 거치게 되어 처리 시간과 데이터 용량의 증가를 초래한다. 반면 XML을 이용한 방식은 메타데이터를 사용하여 렌더링 과정을 대체하기 때문에 시간과 데이터 용량을 줄일 수 있다. 또한 이 방법은 다양한 편집 및 시각특수효과 프로그램에서 지원이 가능하고, 영상편집 관련 분야뿐 만 아니라 영상의 콘텐츠 정보, 그리고 온라인 콘텐츠와의 융합도 가능한 장점이 있다. 이를 웹 기반의 XML의 구조로 발전시키면 영상뿐만 아니라 다양한 다른 매체와의 융합도 가능할 것이다. 본 논문에서는 영화 제작 환경에 적합한 메타데이터 저장 방식과 저장된 메타데이터를 공유하여 편집과정과 시각특수효과과정에서 작업 효율을 높일 수 있는 방법을 제시한다.

• 대한방사선기술학회지:방사선기술과학
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• 제46권4호
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• pp.315-323
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• 2023

Post-mortem computed tomography (PMCT) is commonly employed in the field of forensic pathology. PMCT was mainly performed using a whole-body scan with a wide field of view (FOV), which lead to a decrease in spatial resolution due to the increased pixel size. This study aims to evaluate the potential for developing a super-resolution model based on conditional generative adversarial networks (CGAN) to enhance the image quality of CT. 1761 low-resolution images were obtained using a whole-body scan with a wide FOV of the head phantom, and 341 high-resolution images were obtained using the appropriate FOV for the head phantom. Of the 150 paired images in the total dataset, which were divided into training set (96 paired images) and validation set (54 paired images). Data augmentation was perform to improve the effectiveness of training by implementing rotations and flips. To evaluate the performance of the proposed model, we used the Peak Signal-to-Noise Ratio (PSNR), Structural Similarity Index Measure (SSIM) and Deep Image Structure and Texture Similarity (DISTS). Obtained the PSNR, SSIM, and DISTS values of the entire image and the Medial orbital wall, the zygomatic arch, and the temporal bone, where fractures often occur during head trauma. The proposed method demonstrated improvements in values of PSNR by 13.14%, SSIM by 13.10% and DISTS by 45.45% when compared to low-resolution images. The image quality of the three areas where fractures commonly occur during head trauma has also improved compared to low-resolution images.

• 한국직업건강간호학회지
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• 제19권2호
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• pp.205-216
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• 2010

Purpose: The purpose of this study was to explore relationship among pain, body image and satisfaction in hand-injured workers. Methods: Using a sample of 96 out-patient workers with hand injuries, pain, body image and satisfaction were measured by VAS and Modified Jung Keum-hee's Tennesee Self Concept Scale. Repeated measured ANOVA and a Bonferroni correction for multiple statistical testing during post hoc analyses were conducted to evaluate relationship among pain, body image and satisfaction in hand-injured workers. Result: Functional satisfaction(r=.46, p<.001) and appearance satisfaction(r=.55, p<.001) significantly increased by treatment satisfaction. Functional satisfaction(r=.35, p=.001) and appearance satisfaction(r=.31, p=.002) increased by body image. But treatment satisfaction(r=-.20, p=.049), functional satisfaction (r=-.34, p=.001) and appearance satisfaction (r=-.39, p<.001) significantly decreased by pain. Conclusion: Poor pain management was related to bad body image and treatment satisfaction. Therefore, interventions targeting at pain management are needed for hand-injured workers.