• 전자공학회논문지B
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• 제29B권4호
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• pp.36-47
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• 1992

In this paper, a set of TM(template matching) mask using the AM(associative mapping) technique was generated and the edge detection algorithm for a SAR image was proposed. And also, the performance of the proposed edge detection algorithm was tested with the conventional edge detection techniques. The proposed edge detection algorithm created an edge image which was more accurate and clear than the conventional edge detection techniques and the performance of the proposed detection technique was not deteriorated for low intensity area in the image because the uncertainly thresholded value genetated by the conventional detection methods was requested. Also, the number of masks and the detection time were reduced by adjusting resolution of edge detection and the consideration for the threshold value extracting the edge was very intuitive.

• 한국통신학회논문지
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• 제11권1호
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• pp.73-84
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• 1986

화상이해의 기본적인 특성중의 하나인 edge를 추정하는 statistical 한 방법을 제안하였다. 종래의 edge검출기법은 주로 deterministic한 신호에는 잘 적용되었지만 statistical한 신호에는 만족스러운 결과를 얻을 수 없었다. 본 논문에서는 신호의 statistical 한 성질을 고려한 likelihood함수를 이용하여 결정함수를 구하고, 이것을 최대로 하는 위치를 edge로 선정하는 maximum likelihood edge 검출기법에 대하여 논하였다. 이 기법을 random number generator에 의하여 발생된 통계적인 성질을 갖는 신호에 적용하여 edge가 잘 검출됨을 보였다. 또 이 방법을 통계적인 성질을 갖는 이차원의 화상으로 확장하였을 때에도 정확하게 edge가 검출됨을 알 수 있었다.

• Journal of the Korean Society for Industrial and Applied Mathematics
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• 제27권1호
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• pp.37-55
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• 2023

In this paper we propose a new algorithm for detecting and counting flowers in a complex background based on digital images. The algorithm mainly includes the following parts: edge contour extraction of flowers, edge contour determination of overlapped flowers and flower counting. We use a contour detection technique in Computer Vision (CV) to extract the edge contours of flowers and propose an improved algorithm with a concave point detection technique to find accurate segmentation for overlapped flowers. In this process, we first use the polygon approximation to smooth edge contours and then adopt the second-order central moments to fit ellipse contours to determine whether edge contours overlap. To obtain accurate segmentation points, we calculate the curvature of each pixel point on the edge contours with an improved Curvature Scale Space (CSS) corner detector. Finally, we successively give three adaptive judgment criteria to detect and count flowers accurately and automatically. Both experimental results and the proposed evaluation indicators reveal that the proposed algorithm is more efficient for flower counting.

• 로봇학회논문지
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• 제5권2호
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• pp.85-92
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• 2010

In this paper, we propose a digital image stabilization technique using edge detection and Lucas-Kanade optical flow in order to minimize the motion of the shaken image. The accuracy of motion estimation based on block matching technique depends on the size of search window, which results in long calculation time. Therefore it is not applicable to real-time system. In addition, since the size of vector depends on that of block, it is difficult to estimate the motion which is bigger than the block size. The proposed method extracts the trust region using edge detection, to estimate the motion of some critical points in trust region based on Lucas-Kanade optical flow algorithm. The experimental results show that the proposed method stabilizes the shaking of motion image effectively in real time.

• Journal of Computational Design and Engineering
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• 제3권3호
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• pp.191-197
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• 2016

Since 3D measurement technologies have been widely used in manufacturing industries edge detection in a depth image plays an important role in computer vision applications. In this paper, we have proposed an edge detection process in a depth image based on the image based smoothing and morphological operations. In this method we have used the principle of Median filtering, which has a renowned feature for edge preservation properties. The edge detection was done based on Canny Edge detection principle and was improvised with morphological operations, which are represented as combinations of erosion and dilation. Later, we compared our results with some existing methods and exhibited that this method produced better results. However, this method works in multiframe applications with effective framerates. Thus this technique will aid to detect edges robustly from depth images and contribute to promote applications in depth images such as object detection, object segmentation, etc.

• 한국정보통신학회:학술대회논문집
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• 한국정보통신학회 2013년도 춘계학술대회
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• pp.892-894
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• 2013

디지털 영상 처리 기술이 발전함에 따라 에지는 여러 응용 분야에서 활용되고 있다. 기존의 에지검출 방법에는 마스크를 이용한 Sobel, Prewitt, Roberts, Laplacian 연산자 등이 있다. 이러한 기존의 방법은 구현이 간단하나, AWGN(additive white Gaussian noise)이 첨가된 영상에서 에지 검출의 오류가 발생한다. 따라서 이와 같은 기존의 방법의 단점을 보완하기 위하여, 본 논문에서는 변형된 마스크를 이용한 에지 검출 알고리즘을 제안하였으며, 제안한 알고리즘은 AWGN 환경에서 우수한 에지검출 특성을 나타내었다.

• 한국농업기계학회:학술대회논문집
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• 한국농업기계학회 2000년도 THE THIRD INTERNATIONAL CONFERENCE ON AGRICULTURAL MACHINERY ENGINEERING. V.II
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• pp.279-286
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• 2000

The objective of this research is to detect the papaya fruits on tree in an orchard. The detection of papaya on natural background is difficult because colors of fruits and background such as leaves are similarly green. We cannot separate it from leaves by color information. Therefore, this research will use shape information instead. First, we detect an interested object by detecting its boundary using edge detection technique. However, the edge detection will detect every objects boundary in the image. Therefore, shape description technique will be used to describe which one is the interested object boundary. The good shape description should be invariant in scaling, rotating, and translating. The successful concept is to use Fourier series, which is called "Fourier Descriptors". Elliptic Fourier Descriptors can completely represent any shape, which is selected to describe the shape of papaya. From the edge detection image, it takes a long time to match every boundary directly. The pre-processing task will reduce non-papaya edge to speed up matching time. The deformable template is used to optimize the matching. Then, clustering the similar shapes by the distance between each centroid, papaya can be completely detected from the background.

• 한국산업정보학회논문지
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• 제8권4호
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• pp.38-45
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• 2003

메타 휴리스틱의 한 기법인 Ant System (AS) 알고리듬을 윤곽선 검출 문제에 적용하고 그 실험 결과를 보여준다. 윤곽선의 품질을 픽셀영역간 불일치 정도, 연속성, 두께 및 길이의 관점에서 규정지었다. 적합도 함수를 윤곽선 경로비용 최소화 문제로 전환하여 최적해를 탐색하였다. 예제 영상 실험결과 기존의 다른 기법에 비해, 영상의 질에 무관하게 상대적으로 신속하게 적은 메모리를 차지하는 즉, 최소량의 픽셀로 구성된 윤곽선을 검출할 수 있었다.

• 융합신호처리학회논문지
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• 제17권1호
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• pp.18-25
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• 2016

자동차 보유량이 늘어남에 따라 남녀노소 모두 교통사고에 위협이 가해지고 있으며 교통사고가 자주 일어나는 점을 미연에 방지하기 위해 ADAS가 중요하다. 이러한 교통사고의 주범을 인지하고 방지하는 한 방법이 차선 검출을 이용하는 것이다. 따라서 본 논문에서는 영상처리를 통해 차선검출 기법을 연구하였고 영상처리에 의한 많은 에지 검출기법들 중 대표적인 소벨 에지 검출 기법과 캐니 에지 검출 기법을 사용하여, 두 가지 에지 검출기법을 통해 곡선과 직선의 차선 검출에서 가장 검출율이 좋은 기법을 찾아 직선의 차선을 검출하는 기법에 적용한다. 실험은 총 4,000프레임(주간영상 2,900프레임, 야간영상 1,100프레임)으로 실험을 수행하고, 실험 결과는 주간 영상에서 소벨 에지 검출 기법의 임계치는 2차미분차수로 검출하는 것이 가장 높은 후보 차선 검출율을 보였으며 검출율이 86.1%이고, 캐니 에지 검출 기법의 임계치는 Low=50, High=300에서 가장 높은 88.0%의 검출율을 보였다.

• 대한전자공학회:학술대회논문집
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• 대한전자공학회 2003년도 하계종합학술대회 논문집 Ⅳ
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• pp.2120-2123
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• 2003

This paper presents the moving object detection and tracking algorithm using edge information base on human perceptual system The human visual system recognizes shapes and objects easily and rapidly. It's believed that perceptual organization plays on important role in human perception. It presents edge model(GCS) base on extracted feature by perceptual organization principal and extract edge information by definition of the edge model. Through such human perception system I have introduced the technique in which the computers would recognize the moving object from the edge information just like humans would recognize the moving object precisely.