• 한국멀티미디어학회논문지
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• 제17권2호
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• pp.143-151
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• 2014

악천후로 인하여 화질이 저하된 영상은 사물의 경계에 해당하는 에지 부분이 흐려진다. 본 논문에서는 에지를 최대한으로 선명하게 하여 영상의 시인성을 향상 시키는 화질 개선 방법을 제안한다. 우선 영상의 밝기 필드에서 극점들을 찾아 에지 후보 영역으로 선택하고, 선택된 에지의 측면에 있는 화소들의 밝기로 히스토그램을 형성한다. 형성된 히스토그램의 극소점을 기반으로 히스토그램을 다수의 모드로 분해한다. 모드가 구해지면, 영상 필드에서 에지에 의하여 연결된 모드들을 구하고, 연결된 모드들의 연결 고리를 구한다. 최종적으로 가장 긴 연결 고리를 형성하는 모드간의 간격을 최대한으로 벌린다. 이 때 최소 밝기 모드와 최대 밝기 모드는 화소 밝기 범위 이내에 있어야 한다. 이와 같이 모드의 간격을 벌림으로써 에지를 선명하게 하고 영상의 시인성을 향상한다. 본 논문에서 제안한 방법은 적은 연산량으로 기존의 방법만큼 좋은 성능으로 화질을 개선함을 보여준다.

• 대한방사선기술학회지:방사선기술과학
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• 제41권5호
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• pp.463-469
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• 2018

Morphological information such as shape and margin of micro lesion is important information for diagnosis of disease in clinical imaging. In this study, we investigated the morphological changes of the micro lesions by comparing the contrast and area in grid suppressed DR images according to grid frequency. In the profile analysis of the image, the mass showed an average intensity variation of 8.6 ~ 72.4 after suppression, The higher the grid frequency, the more the contrast was increased. However, in the images obtained using 103 lp / inch, which is a grid frequency less than the sampling frequency, the contrast of the mass in the vertical direction decreased after suppression. In the binary image, the area change of the mass was also large. As a result, the shape, size, and margin of the mass changed. In the case of very small calcification, the higher the grid frequency is the larger the change in contrast, so that a clear image can be obtained in the post-suppression image. However, we could confirm that the margin of the lesion was blurred and the lesion was lost in some of the images using the 103 lp / inch grid. The higher the frequency of the grid, The change of the contrast of fiber occurred largely and clear boundary was confirmed. The decrease of the number of pixels was small and morphological change was small. In conclusion, when using a grid frequency that is not suitable for the sample frequency, morphological changes or lesion loss of micro lesions in the post- suppression image may give the possibility of misdiagnosis in diagnosis and differentiation of the image.

• Asian Pacific Journal of Cancer Prevention
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• 제15권23호
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• pp.10509-10512
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• 2015

Objective: To investigate the differential features of CT images in children with neuroblastomas (N) and ganglioneuroblastomas (G). Materials and Methods: Clinical data of 12 children in group G and 15 in group N undergoing CT examination and definitely diagnosed by pathology were retrospectively analyzed. The focal conditions were observed and compared in the two groups, including location, size, boundaries, morphology, enhanced degree and mode, abdominal vascular involvement, presence or absence of spanning the midline, infiltration of peripheral organs, angiography manifestations in tumors or surroundings, presence or absence of calcification and vascular tumor emboli as well as metastases of distal organs and lymph nodes. Results: In group N, the incidence of tumors in the adrenal area was conspicuously higher than in group G (P<0.05), while that of tumors with regular morphology and clear boundaries was significantly lower than in group G (P<0.01); Angiography manifestation rate and incidences of vascular embedding, lymph node metastasis, infiltration and organic metastasis in group N were all markedly higher than in group G (P<0.05). There was no statistical significance between the two groups in terms of focal size, presence or absence of calcification and spanning the midline, and enhanced degree and mode, as well as vascular tumor emboli (P>0.05). Conclusions: Mostly located in adrenal areas and with vascular embedding as a primary manifestation, the neuroblastoma extremely readily metastases to lymph nodes and other organs as well as infiltrating local tissues, with dilation on angiography frequent in or around the tumors. With vascular displacement as a primary manifestation, ganglioneuroblastoma has a regular morphology and clear boundaries.

• 지능정보연구
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• 제10권1호
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• pp.1-11
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• 2004

원 영상을 처리하여 보다 강조된 영상을 얻는다는 것은 기존의 영상을 가공하여 이를 통하여 보다 낳은 결과를 얻기 위한 전처리의 중요한 한 부분이라고도 할 수 있다. 강조된 영상이라는 것은 단지 보기 좋은 영상만을 말하는 것이 아니고, 주어진 영상을 더 뚜렷하게 하는 것을 포함한다. 강조된 영상은 영상처리에 있어서 윤곽선 추출이나 영상 인식 등에 유용한 자료로 활용되기도 하는데, 특히 저 화질 영상의 경우에는 원 영상을 얼마만큼 잘 나타내느냐에 따라서 인식의 정도가 다르게 나타난다. 현재 강조된 영상을 얻는 알고리즘들은 다양한 종류의 영상에서 원하는 만큼의 뚜렷한 영상을 얻지 못하거나, 화질의 크기나 히스토그램의 집적도에 비례하여 많은 처리 시간을 필요로 하는 단점이 있다. 본 연구에서는 저 화질 영상뿐만 아니라 여러 가지 종류의 영상에 있어서 차후 사용될 영상의 본래 활용 목적에 적합하도록 강조하는 방법으로서 픽셀들이 히스토그램상에서 차지하는 분포도를 변경하는 방법을 제안한다. 즉, 영상에 있어서 히스토그램의 값을 역추적하면서 히스토그램 분포도를 수정 및 변경함으로써 원 영상의 화질을 개선하는 방법으로 제안한 방법의 경우에는 기존의 히스토그램 평활화 방법에 의한 결과 영상과 동일한 결과를 얻음과 동시에 그 처리시간에 있어서는 상당한 이익을 볼 수 있었다.

• 치과방사선
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• 제14권1호
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• pp.81-87
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• 1984

This study was performed to observe the secondary images and to analyse the relationships between the primary and secondary images in panoramic radiograph. Using the Moritta's Panex-EC panoramic x-ray machine and the human dry skull, the author analysed 17 radiographs which were selected from 65 radiographs of the dry skull that attached the radiopaque materials, and the attached regions of the radiopaque materials were the normal anatomical structures which were important and selected as a regions for the evaluation of the secondary images effectively. The results were as follows; 1. The cervical vertebrae showed three images. The midline image was the most distorted and less clear, and bilateral images were slightly superimposed over the posterior border of the mandibular ramus. 2. In mandible, the secondary image of the posterior border of the ramus was superimposed on the opposite ramus region, and this image was elongated from the anterior border of the ramus to the lateral side of the posterior border of the ramus. The secondary image of the condyle was observed on the upper area of the coronoid process, the sigmoid notch and the condyle in opposite side. 3. In maxilla, the posterior region of the hard palate showed the secondary image on the lower part of the nasal cavity and the medial wall of the maxillary sinus. 4. The primary images of the occipital condyle and the mastoid process appeared on the same region, and only the secondary image of the occipital condyle was observed symmetrically on the opposite side with similar shape to the primary one. 5. In the cranial base, the anatomical structures of the midsagittal portions like a inferior border of the frontal sinus, sella turcica, inferior borderr of the sphenoid sinus and inferior border of the posterior part of the occipital bone showed the simillar shape between the primary and secondary images symmetrically. 6. The petrous portion of the temporal bone showed the secondary image on the lateral side of the sella-turcica, and the secondary images of the posterior border of lesser wing, superior border of greater wing of the sphenoid bone and posterior border were observed on the anterior-superior and inferior region of the sella-turcica.

• 대기
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• 제21권2호
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• pp.131-142
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• 2011

Spectral solar irradiances were observed using a visible and UV Multi-Filter Rotating Shadowband Radiometer on the rooftop of the Science Building at Yonsei University, Seoul ($37.57^{\circ}N$, $126.98^{\circ}E$, 86 m) during one year period in 2006. 1-min measurements of global(total) and diffuse solar irradiances over the solar zenith angle (SZA) ranges from $20^{\circ}$ to $70^{\circ}$ were used to examine the effects of clouds and total optical depth (TOD) on enhancing four solar irradiance components (broadband 395-955 nm, UV channel 304.5 nm, visible channel 495.2 nm, and infrared channel 869.2 nm) together with the sky camera images for the assessment of cloud conditions at the time of each measurement. The obtained clear-sky irradiance measurements were used for empirical model of clear-sky irradiance with the cosine of the solar zenith angle (SZA) as an independent variable. These developed models produce continuous estimates of global and diffuse solar irradiances for clear sky. Then, the clear-sky irradiances are used to estimate the effects of clouds and TOD on the enhancement of surface solar irradiance as a difference between the measured and the estimated clear-sky values. It was found that the enhancements occur at TODs less than 1.0 (i.e. transmissivity greater than 37%) when solar disk was not obscured or obscured by optically thin clouds. Although the TOD is less than 1.0, the probability of the occurrence for the enhancements shows 50~65% depending on four different solar radiation components with the low UV irradiance. The cumulus types such as stratoculmus and altoculumus were found to produce localized enhancement of broadband global solar irradiance of up to 36.0% at TOD of 0.43 under overcast skies (cloud cover 90%) when direct solar beam was unobstructed through the broken clouds. However, those same type clouds were found to attenuate up to 80% of the incoming global solar irradiance at TOD of about 7.0. The maximum global UV enhancement was only 3.8% which is much lower than those of other three solar components because of the light scattering efficiency of cloud drops. It was shown that the most of the enhancements occurred under cloud cover from 40 to 90%. The broadband global enhancement greater than 20% occurred for SZAs ranging from 28 to $62^{\circ}$. The broadband diffuse irradiance has been increased up to 467.8% (TOD 0.34) by clouds. In the case of channel 869.0 nm, the maximum diffuse enhancement was 609.5%. Thus, it is required to measure irradiance for various cloud conditions in order to obtain climatological values, to trace the differences among cloud types, and to eventually estimate the influence on solar irradiance by cloud characteristics.

• 대한화장품학회지
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• 제43권4호
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• pp.349-355
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• 2017

피부색은 건강상태나 연령을 인식하는데 중요한 역할을 할 뿐만 아니라 선호하는 피부색에 따라 매력을 느끼는 기준이 되기도 한다. 다수의 소비자들은 자신의 피부색을 개선시키기 위해 화장품을 선택하기도 하며 이러한 수요에 따라 화장품의 종류는 다양해졌다. 최근에는 '하얗고 밝은 피부'에서 '건강하고 생기있어 보이는 피부' 등 안색의 선호가 다양해지고 관련 표현의 효능을 표방하는 화장품이 증가하고 있지만 '피부색(안색) 개선'에 대한 객관적인 평가 기준이 없어 본 연구에서는 피부색을 표현하는 형용사(complexion -describing adjectives, CDAs)를 선정하고 quasi $L^*a^*b^*$ 값을 이용한 통계분석 방법으로 피부색을 표현하는 형용사를 정량화하였다. CDA 7개['창백한(pale)', '깨끗한(clear)', '화사한(radiant)', '생기있는(lively)', '건강한(healthy)', '불그스름한(rosy)', '칙칙한(dull)']를 선별하였고 피부색을 평가한 경험이 있는 30명의 패널이 각각의 형용사를 밝은 피부 사진과 어두운 피부 사진의 색감에 적용하고 이를 다시 수치화하여 단어간에 통계적 유의성 여부를 확인하였다. 그 결과, 어두운 피부의 기준 이미지와 각각의 CDA를 반영한 조정 이미지, 밝은 피부의 기준 이미지와 각각의 CDA를 반영한 조정 이미지간의 quasi $L^*$, $a^*$, $b^*$ 값이 통계적 유의차를 보였다(p< 0.05). 그러나 같은 CDA를 반영한 밝은 피부와 어두운 피부간에는 통계적 유의차가 없었고, 비슷한 계열의 형용사 간에 그룹화되는 경향[(i)창백한-깨끗한-화사한 (ii)생기있는-건강한-불그스름한 (iii)칙칙한]을 확인하였다. 본 연구에서는 주관적인 느낌을 표현하는 형용사를 객관적 지표로 수치화하고 이를 통해 피부색을 평가하는 기준으로 활용할 수 있음을 제시하고자 한다.

• KIEAE Journal
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• 제8권2호
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• pp.11-21
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• 2008

The purpose of this study is to interpret the visual and auditory images and cognitive characteristics about townscapes in Namwon city. It was acquired the survey results about 8 types of verbal interviews and 2 kinds of sketch maps which are based on urban images from 102 Namwon residents. They held in a variety of images of Namwon in their minds such as Jiri mountain, clean environment, sightseeing, special products, urban/building structures, Korean classical music, historical novel, local sports, and emotional images. The nice streets or places which the residents recommended are the places which have abundant natural areas, psychological peace and rest, available space for physical activity, places for performances and events, and regional attractions. The streets or places which they didn't like are decadent places, and areas of crowded traffic. The transition times of visual and auditory scene can be classified with the Saemaul movement in the 1970's(the rural new community movement) and the improvement of the city in the 1990's. The elements of visual images in Namwon city on the basis of the cognitive maps were expressed such elements as paths, districts, nodes, edges, and landmarks. The elements of auditory images, which are on the basis of the concept of the soundscape, included sounds of narrative musical form unique to Korea; p'ansori, sounds of traditional markets, and sounds of nature. It was found that the imageability of visual and auditory images is relatively clear in specific areas in Namwon city.

• 한국정보통신학회논문지
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• 제18권2호
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• pp.431-436
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• 2014

세포 분할 작업은 세포 이미지의 배경으로부터 세포 영역을 추출하는 작업으로 배양과정에 있는 살아있는 세포를 이미지화하여 분석하는 바이오 이미징 분야에서 기초적인 작업들 중 하나이다. 선명한 이미지의 경우 바이모덜 히스토그램 분포를 가지므로 Otsu와 같은 전역임계값 알고리즘을 이용하여 쉽게 세포분할 작업을 수행할 수 있지만 희미한 이미지의 경우는 정확한 세포 분할을 하기가 어렵다. 본 논문에서는 입력된 세포이미지의 히스토그램을 분석하여 히스토그램 분포에 따라 분류한 후 바이모덜 분포를 가지는 이미지의 경우 전역임계값 알고리즘을 적용하고 유니모덜 분포를 가지는 이미지의 경우 영역을 분할하여 부분 영역별로 다른 임계값을 적용하는 새포 분할 시스템을 개발하였다. 실험결과 제안한 시스템은 바이모덜 분포를 가지는 세포이미지 뿐만 아니라 유니모덜 분포를 가지는 세포 이미지에 대해서도 정확한 세포 분할 작업을 수행하였다.

• 복식
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• 제58권10호
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• pp.148-163
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• 2008

The purpose of this study is to review the previous researches, to make clear the difference between general image and brand image in overseas luxury fashion brands. The questionaries were given to female residents in the ages of $20s'{\sim}40s'$ in Seoul and Kyung-gi province in October 2007. The collected data were analyzed by using SPSS 12.0 software such as paired t-test. The results of this study as fellows; 1. As the result of the analysis of the difference across general images, it was regarded as the most Reputed' and 'Conspicuous' image. 2. As the result of the analysis of the difference across brand images of oversea fashion luxury brands, it was regarded as the most Reputed' image. 3. As the result of analysis of the difference between general images and brand images in overseas fashion luxury goods, it was found out that Chanel brand was regarded as more 'luxurious' and 'original' image, on the other hand, Giorgio Armani and Burberry were not.