• Proceedings of the Korean Institute of Information and Commucation Sciences Conference
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• 2016.05a
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• pp.409-411
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• 2016

Salt and pepper noise is caused by various causes such as camera malfunction, storage media memory error, and transmission channel error. Representative filters to remove salt and pepper noise include SMF(standard median filter), CWMF(center weighted median filter), and AMF(adaptive median filter). However previous filters have inadequate noise removal characteristics in high density salt-and-pepper noise environment. Therefore the study suggested a composite filter which, through noise evaluation, preserves original pixels when the central pixel is non-noise, and uses spatial weighted value mask and median when there is noise.

• Proceedings of the Korean Institute of Information and Commucation Sciences Conference
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• 2017.05a
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• pp.793-796
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• 2017

Image signal can be damaged by a variety of noises during the signal processing, and multiple studies have been conducted to restore these signals. The representative noises to be added in the image are salt and pepper noise, additive white Gaussian noise(AWGN), and the composite noise which two noises are combined. Therefore, the algorithms were proposed to process with quadratic spline interpolation and median filter in case of salt and pepper noise with the central pixel of the local mask, and to process with weight filter by pixel changes in case of AWGN, upon noise determination to restore the damaged image in the composite noise environment, in this article.

• Journal of the Korea Institute of Information and Communication Engineering
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• v.18 no.9
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• pp.2259-2264
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• 2014

For edge detection methods, there are Sobel, Prewitt, Roberts and Canny edge detector, and these methods have insufficient detection characteristics in the image corrupted by the impulse noise. Therefore in this paper, in order to improve these disadvantages of the previous methods and to effectively detect the edge in the impulse noise environment, using the $5{\times}5$ mask, the noise factors within the $3{\times}3$ mask based on the central pixel is determined, and depending on its status, for noise-free it is processed as is, and if noise is found, by obtaining the estimated mask using the adjacent pixels of each factor, an algorithm that detects the edge is proposed.

• Sim-seong Yeon-gu
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• v.32 no.1
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• pp.17-53
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• 2017

This essay interpreted and analyzed 3 Bonpuri (shamanic rituals) of Jeju Island from Jungian perspectives. These rituals (Chokong, Euigong, and Samgong Bonpuri) includes myths about gods who have both anthropomorphic and supreme aspects. 3 myths showed significant psychological motifs such as hieros gamos, parental complex, ethics, numinose, creativity, and return to the origin. Compared to other religious worshipping ceremony such as shamanism in North America, sufism, and tantraism, similar psychological motifs are discussed. Understanding and amplifying the psychological symbols and process related these motifs may help analysis to be more meaningful and revivifying the human psyche especially in distress and sadness.

• (The)Study of the Eastern Classic
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• no.70
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• pp.467-493
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• 2018

This Study looks into increase of Match-ending type of 'Ureonggaksi' folktale and its secularization focusing on Match-ending types of 71 materials from "The Comprehensive Collection of Korean Folklore"(1979-1985) and 'The Revision And Enlargement project' (2008-2018). This study classifies 'Ureonggaksi' folktale into ones of 1910-70s, 80s, and 2000s. Match-ending types increase in "The Comprehensive Collection of Korean Folklore" and 'The Revision And Enlargement project'. Match-ending types constitute 60% of Ureonggaksi' folktale materials from "The Comprehensive Collection of Korean Folklore" and 'The Revision And Enlargement project', which is twice more than 34% of Parting-ending types. Firstly, taboo motif in Match-ending types is inclined to disappear. Even if taboo motif appears, materials with keeping its taboo are more than breaking one. It means that the function of taboo weakens, since the meaning of sacred wedding is emphasized when it is broken. Desacralization of Ureonggaksi figure is inclined to make the match of hero and heroin recognized as a common one. Increase of match type without taboo motif, and a new Ureonggaksi type in 'The Revision And Enlargement project', Underground monster-defeating type, with a character of Romantic matching narrative, mean Discoloration of Ureonggaksi folktale. Interest and recognition on sacred existence disappears, and there is found the conciousness to pursue happiness in real world through connection between man and woman by realistic world-view. This study contains 37 Ureonggaksi folktales recorded in 'The Revision And Enlargement project' (2008-2018) as material. Furthermore, there are found new Ureonggaksi types in 'The Revision And Enlargement project': Underground monster-defeating type, which is transformed from groom with bird-feather clothes type(a kind of matching-ending type of Ureonggaksi folktale), and the subjugated's resistance awareness weakens and shows a character of Romantic matching narrative.

• Korean Journal of Digital Imaging in Medicine
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• v.9 no.1
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• pp.7-15
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• 2007

This study aim to investigate image characteristics due to focus-grid and head phantom decentering from the armorphos silicon thin film transistor detector the fixed focus-grid is applied, wish to propose right use method of digital medical equipment. Acquired image according to focus-grid and head phantom position decentering using head phantom on armorphos silicon thin film transistor detector the fixed focus-grid is applied. acquired image evaluate pixel value, histogram, plot profile, surface plot using NIB (Image J) image analysis program and compared decentering image with standard image. Mean value and standard deviation value of focus-grid lateral decentering and duplex decentering of focus-grid and head phantom decreased by ratio, consequently increase of horizontality, diagonal decentering. also, deteriorated contrast of image because frequency of high pixel value decreases fairly. according increases decentering, image distortion phenomenon was increase, by next time, pixel mean value of head phantom decentering was no big change but horizontality, diagonal, mean value and standard deviation value of pixel decreased by ratio. Even if increase pixel noise of image because wide latitude and post processing ability of digital detector, radiotechnologist can not recognize. Therefore, radiotechnologist must recognize correctly the photographing factors which increases pixel noise on the grid system installation digital detector and should exam.

• Proceedings of the IEEK Conference
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• 2003.07e
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• pp.1795-1798
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• 2003

내용을 기반으로 하는 영상검색에 있어 색상과 물체의 특징은 중요한 요소로서, 지금까지의 검색 기법들은 이들을 중심으로 연구가 진행되어 왔으며, 이들을 추출하기 위해서는 color 영상에서의 배경과 물체의 분리는 선행되어야 할 중요한 과제이다. color 영상에서 물체를 분리 하고자 하는 여러 가지 시도가 있었으나, 대부분 clustering 에 준하고 있으며, 처리시간이나 결과에 있어서 그다지 좋은 효과를 내지 못하는 것도 사실이다. 따라서, 영상검색을 위한 물체의 분리 기법으로서는 적합하지 않다. 본 논문에서는 물체가 영상의 중심에 주로 위치한다는 점에 착안한 방법을 응용하여 영상의 외곽에 존재하는 색상뿐만 아니라 명암까지 분석하여, 배경을 구성하는 화소들의 색상 및 명암과 동일하지 않은 색상들로 이루어진 부분을 물체로 판단, 추출하는 기법에 대해 설명하고, edge를 추출해낸 영상의 정보와 합성하여 최적의 물체를 찾아 검색을 하는 기법에 대하여 기술하였다.

• The Journal of Korean Institute of Communications and Information Sciences
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• v.26 no.8B
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• pp.1141-1151
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• 2001

본 논문에서는 효과적으로 선택된 초기 탐색 위치를 이용한 움직임 추정의 고속 알고리즘을 제안하였다. 제안된 알고리즘에서는 2$\times$2화소 블록 평균으로 부표본화 영상에서 움직임 벡터를 얻어 원영상 비율로 확대하고, 주위 블록의 움직임으로부터 예측 움직임 벡터를 구하여, 이 중에서 정합오차가 작은 것을 초기 탐색 위치로 선택한다. 그리고 선택된 초기 탐색 위치를 중심으로 회전 탐색을 시작하여, 연속 소거 알고리즘으로 탐색할 후보 블록을 선택하고, 부분 정합 왜곡 소거법을 사용하여 블록간 정합오차 계산량을 줄이면서, 고속으로 움직임 벡터를 추정한다. 알고리즘의 실제 적용에 있어서는 선택된 초기 탐색 위치를 중심으로 회전 탐색 패턴의 탐색 범위를 조절하거나, 매크로 블록 당 복잡도를 제한하여 계산량을 줄일 수 있다. 실험 결과, 제안된 알고리즘은 전역탐색 블록정합 알고리즘에 대하여 0.2dB 이하의 미소한 평균 PSNR 저하만을 발생하면서, FBMA 복잡도의 3% 이하의 평균 복잡도를 소요하였다. 이것은 3단계 탐색법에 대하여 40% 이하의 계산량이다. 그리고 실험 영상들의 각 프레임에 대해서도 비슷한 성능을 보임을 확인하였다.

• Proceedings of the Korean Institute of Information and Commucation Sciences Conference
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• 2022.05a
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• pp.421-424
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• 2022

Hough transform is a representative algorithm for detecting straight lines in an edge image. It corresponds the parameters of straight lines that may occur in the edge pixel into a parameter space, and detects valid parameters satisfying a given condition as straight lines. In general Hough transform, the parameters of the line are calculated with the image origin as the reference point. However, in this paper, the Hough transform based on the image center as a reference point is performed and its performance is compared and analyzed with the conventional Hough transform.

• Korean Journal of Optics and Photonics
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• v.21 no.1
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• pp.21-25
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• 2010

In this paper, in order to enhance the image reconstruction performance of white light scanning interferometry(WLI), we demonstrate the scattered point noise filtering performance of post-processing methods. Median filtering is similar to using an averaging filter. Because the median value is less sensitive than the mean to extreme values, the median filter can remove the scattered point noise from a height-map without significantly reducing the sharpness of the image. In several specific cases, however, the median filter can't remove the scattered point noise. Therefore, we propose a comparative mean filter that uses order-statistic filtering and the mean of the neighborhood pixels. The performance is demonstrated by measuring an array of metal solder balls fabricated on PCB. The proposed method reduced the noise pixels by 4.4 percent.