• Fisheries and Aquatic Sciences
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• 제2권2호
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• pp.172-175
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• 1999

Relative DNA contents in some harmful algae were measured using DAPI staining and image analysis system. This method was useful to identify some morphologically similar species and isolates from harmful algal blooms (HABs). In exponential phase, Prorocentrum micans had higher relative DNA content (RD) of $1.83\pm0.52$ than any other isolates, followed by Cochlodinium polykrikoides $(1.10\pm0.46)$ Alexandrium tamarense $(0.93\pm0.32)$ Gyrodinium impudicum $(0.56\pm0.17)$, Scrippsiella trochoidea $(0.41\pm0.26)$ and P. minimum$(0.05\pm0.01)$. When they were fixed with Lugol's solution, it was difficult to d,iscern C. polykrikoides from G. impudicum under the light microscope, but the DNA contents were quite different in two species. C. polykrikoides contained about twice as much RD as G. impudicum under the same culture conditions and exponential phase. DAPI­stained DNA feature in C. polykrikodes showed concentrated in the peripheral part of the cell, but in G. impudicum showed a compact structure in the central part. Although A. tamarense and S. trochoidea were morphologically similar under the light microscope, nuclear DNA content of A. tamarense was twice as much as that of S. trochoidea.

• 치과방사선
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• 제27권1호
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• pp.87-97
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• 1997

The purpose of this study was to evaluate the method for quantitative assessment of bone mass from aluminum-equivalent value of hydroxyapatite by using digital imaging system consisted of Power Macintosh 7200/120, 15-inch color monitor, and GT-9000 scanner with transparency unit. After aluminum-equivalent image made from correlation between aluminum thickness and grey scale, the accuracy of conversion to mass from aluminum-equivalent value was evaluated. Measured bone mass was compared with converted bone mass from aluminum-equivalent value of hydroxyapatite block by correlation formula between aluminum-equivalent value of hydroxyapatite block and hydroxyapatite mass. The results of this study were as follow; 1. Correlation between aluminum thickness and grey level for obtaining aluminum-equivalent image was high positively associated(r²=0.99). Converted masses from aluminum-equivalent value were very similar to measured masses. There was, statistically, no significant difference(P<0.05) between them 2. Correlation between hydroxyapatite aluminum-equivalent and hydroxyapatite mass was shown to linear relation (r²=0.95). 3. Converted masses from aluminum-equivalent value of 3 dry mandible segments were similar to measured masses. The difference between the exposure directions was not significantly different(P<0.05).

• 한국멀티미디어학회논문지
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• 제3권6호
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• pp.575-584
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• 2000

본 논문에서는 이진 집합하에서 칼라 공간과 형태 정보를 가지고 새로운 영상검색 방법을 제시한다. 각 영상에 대한 칼라 공간 정보는 칼라 이진세트에 의해 구해지고 형태정보는 영역 세그멘테이션에 의해서 구해진다. 영상 검객 과정에서, 질의 영상과 데이터베이스 영상들의 칼라 및 영상 이진세트들을 비교하여 검색될 후보영상의 집합이 결정된다. 특히, 유사도 측정은 시차적으로 유사한 칼라들의 분포와 객체의 칼라공간 및 형태 특징에 가중치를 고려한 검색이 가능하도록 하였다. 또한 검색 과정의 속도를 향상시키기 위해 후보영상에 대한 복잡한 유사도 측정을 단순히 수행할 수 있도록 새로운 검색 기법을 제안하였다. 위에서 제안한 방법과 3,000개의 화상들로 이루어진 영상 데이터베이스에 대한 구현 실험을 수행하여 제안된 칼라 공간 및 형태특징을 기반으로 한 영상 검색이 비교적 효과적인 결과를 보였다.

• 정보처리학회논문지B
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• 제9B권5호
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• pp.701-706
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• 2002

영상의 색상 정보는 비슷한 영상들의 유사도를 효과적으로 측정하는데 사용된다. 그러나, 색상정보의 크기는 영상 데이터베이스에서 효율적으로 다루기에는 너무나 방대하다. 본 논문에서는 히스토그램 보간법에 의하여 유사한 영상들을 검색하는 새로운 방법을 제시한다 알고리즘의 기본 원리는 색상 히스토그램의 분포를 이용하여 영상을 검색하는 기존 방법에서 출발한다. 그러나, 질의 영상과 대상 영상과의 유사도를 결정하는데 있어서 보간법에 의하여 히스토그램의 분포도를 간략화 시킨다는 근본적인 차이를 가지고 있다. 색상 히스토그램의 분포는 최적 차수의 다항식으로 보간되어서 표현되었다. 히스토그램의 분포가 보간된 후에는 저차원 다항식의 계수들만이 색상 구분자로서 데이터베이스에 저장되고 검색하는데 활용될 수 있다. 제안된 방법은 실제 영상들에 적용되었으며 만족할 만한 결과를 보여주고 있다.

• 한국표면공학회지
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• 제55권6호
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• pp.403-407
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• 2022

Grain size of material is important factor in evaluating mechanical properties. Methods for grain size determination are described in ASTM grain size standards. However, conventional method require pretreatment of the surface to clarify grain boundaries. In this study, the grain size from the surface image obtained from scanning electron microscope was measured using the watershed algorithm, which is a region-based method among image segmentation techniques. The shapes of the crystals are similar to each other, but the size and growth height are different. In addition, crystal grains are adjacent to each other, so it is very similar to the shape image of the topography. Therefore, grain boundaries can be efficiently detected using the Watershed algorithm.

• 대한화학회지
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• 제67권4호
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• pp.222-225
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• 2023

Metallic salts of C10-18 aliphatic carboxylic acids were prepared and their scanning electron microscopic images were analyzed for the morphology dependency with the metal and the carboxylic acid. Regardless of metal ion, metal salts of dicarboxylic acids showed a high crystallinity with a fiber image (SuA-Na). The aromatic dicarboxylates also represented a morphology of a rectangular-rod or board shapes (IA-Li, IA-Ba). With Na ion, most aliphatic carboxylate (MA, PA, SA) showed a fiber-like crystallinity. However, other monovalent Li, K and multivalent Mg, especially Al ion resulted a glassy-amorphous in the metallic salts of acids (MA, PA, SA). With divalent Ba and Ca ions, the metal salt of aliphatic acids expressed a branched round cluster shape as in SA-Ca, SA-Ba. Both Li and Mg ions with a similar size showed a strong morphological similarity in the metallic salts of aliphatic acids MA, PA, SA. In the case of Na and Ca ions with a similar size (98, 106 pm), both ionic salts of stearic acid gave a branching effect for a fiber or round granular image. In the case of hydroxyl-aliphatic acids (HLA, HPA, HSA), the fiber images in HLA-Na and HSA-Na was appeared about 100 nm thicker than those of nonhydroxycarboxylates (LA-Na, SA-Na). The metallic salts of unsaturated C-18 carboxylic acids (OlA, LeA and LnA) showed an amorphous glassy image due to a kinked carbon chain.

• 한국광학회지
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• 제34권6호
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• pp.276-282
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• 2023

본 논문에서는 가격이 비싼 고보 조명을 대체하기 위해 freeform lens를 사용하여 조명 광학계를 설계하였다. Freeform lens 조명은 이미지 마스크를 사용하지 않으며, 렌즈 한 매만으로도 렌즈 면에서 직접 이미지를 형성하여 조사할 수 있어 고보 조명에 비해 단가를 절감할 수 있다. 또한 설계한 freeform lens 조명의 성능을 확인하기 위해서 조도 시뮬레이션을 진행하였다. 이를 통해 설계한 조명이 조사하고자 하는 이미지와 유사한 조도분포를 가지며, 고보 조명의 성능과 유사한 광효율 47%를 가지므로 고보 조명을 대체할 수 있음을 확인하였다.

• KSII Transactions on Internet and Information Systems (TIIS)
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• 제11권5호
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• pp.2576-2589
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• 2017

Co-saliency detection is a task of detecting same or similar objects in multi-scene, and has been an important preprocessing step for multi-scene image processing. However existing methods lack efficiency to match similar areas from different images. In addition, they are confined to single image detection without a unified framework to calculate co-saliency. In this paper, we propose a novel model called Superpixel Matching-Cellular Automata (SMCA). We use Hausdorff distance adjacent superpixel sets instead of single superpixel since the feature matching accuracy of single superpixel is poor. We further introduce Cellular Automata to exploit the intrinsic relevance of similar regions through interactions with neighbors in multi-scene. Extensive evaluations show that the SMCA model achieves leading performance compared to state-of-the-art methods on both efficiency and accuracy.

• 방송공학회논문지
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• 제2권2호
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• pp.156-169
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• 1997

본 논문에서는 형태학적 연산(morphological operation)과 영역 융합(region merging) 방법을 이용한 영상 분할(image segmentation) 방법을 제안한다. 이를 위해서 형태학적 필터(morphological filter)를 이용하여 단순화한 영상에 대해, 다중크기 경사(multiscale gradient) 연산자를 이용하여 경사 영상(gradient image)을 얻는다. 경사 영상에 watershed 변환을 적용하면 분할 영상을 얻을 수 있는데, 이렇게 얻은 분할 영상은 대개 과분할(oversegmentation) 영상이므로, 분할 영역을 줄이기 위해 미소 영역(small region)이나 비슷한 특성을 갖는 인접 영역들은 서로 융합시킬 필요가 있다. 본 논문에서는 영역을 융합하기 위한 기준으로서 영역간의 평균 에지 강도와 각 영역의 화소값들에 비해 평균값을 사용하는데, 이러한 융합 기준은 contour following 과정에서 계산된다. 제안한 방법은 watershed 알고리듬, 영역에 기반한 영상 분할, 경계에 기반한 분할 방법을 결합한 방법으로서, 향상된 영상 분할이 가능함을 실험을 통하여 제시하였다.

• 한국산업융합학회 논문집
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• 제18권2호
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• pp.90-98
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• 2015

This research propose with image-based visual a new approach to design a feedback control of mobile robot. because mobile robot must be recharged periodically, it is necessary to detect and move to docking station. Generally, laser scanner is used for detect of position of docking station. CCD Camera is also used for this purpose. In case of using camera, the position-based visual servoing method is widely used. But position-based visual servoing method requires the accurate calibration and it is hard and complex work. Another method using cameras is inmage-based visual feedback. Recently, image based visual feedback is widely used for robotic application. But it has a problem that cannot have linear trajectory in the 3-dimensional space. Because of this weak point, image-based visual servoing has a limit for real application. in case of 2-dimensional movement on the plane, it has also similar problem. In order to solve this problem, we point out the main reason of the problem of the resolved rate control method that has been generally used in the image-based visual servoing and we propose an image-based visual feedback method that can reduce the curved trajectory of mobile robot in th cartesian space.