• 한국통신학회논문지
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• 제25권6B호
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• pp.993-1001
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• 2000

This research features a method that quantitatively evaluates the performance of edge detection algorithms. Contrary to conventional methods that evaluate the performance of edge detection as a function of the amount of noise added to he input image, the proposed method is capable of assessing the performance of edge detection algorithms based on chosen parameters that influence the performance of edge detection. We have proposed a quantitative measure, called average performance index, that compares the average performance of different edge detection algorithms. We have applied the method to the commonly used edge detectors, Sobel, LOG(Laplacian of Gaussian), and Canny edge detectors for noisy images that contain straight line edges and curved line edges. Two kinds of noises i.e, Gaussian and impulse noises, are used. Experimental results show that our method of quantitatively evaluating the performance of edge detection algorithms can facilitate the selection of the optimal dge detection algorithm for a given task.

• 한국음향학회:학술대회논문집
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• 한국음향학회 1994년도 제11회 음성통신 및 신호처리 워크샵 논문집 (SCAS 11권 1호)
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• pp.42-47
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• 1994

A pitch detector is an essential component in a variety of speech processing systems. Besides providing valuable insights into the nature of the exciation source for speech production, the pitch contour of an utterance is useful for recognizing speakers, aids-to-the handicapped, and is required in almost all speech analysis-synthesis system. Because of the importance of the pitch detection, a wide variety algorithms for pitch detection have been proposed in speech procesing literature. Thus, in this paper we discuss th evarious type of pitch detection algorithms which have been proposed until now. Then we provide th eperformance measurements for seven pitch detection algorithms.

• 대한원격탐사학회지
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• 제28권4호
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• pp.369-392
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• 2012

현재까지 초분광영상을 위한 다양한 표적탐지 알고리즘이 개발 및 사용되고 있다. 그러나 표적탐지 알고리즘의 비교 및 검증 기준으로 1~2가지 영상에 적용한 탐지정확도 만을 사용하고 있어, 사용자 입장에서 그 적용성을 평가하는 데에는 한계가 있다. 본 연구의 목적은 초분광영상에 대한 표적탐지 알고리즘의 적용성을 체계적으로 분석하는 것이다. 이를 위하여 표적, 배경, 영상의 분광적 또는 복사적 특성에 관련된 5가지 기준 인자들을 정의하였고, 각 인자의 변이에 따른 6가지 기존 표적탐지 알고리즘의 탐지정확도 변화를 비교하였다. 이와 더불어 영상 크기에 따른 각 알고리즘의 처리시간을 비교하였다. 그 결과 탐지정확도 측면에서는 기준인자에 따라 적용성이 높은 알고리즘의 종류가 다르게 나타났다. 처리시간은 2차 통계값 기반 알고리즘이 다른 알고리즘에 비해 매우 크게 나타났다. 탐지정확도와 처리시간을 종합적으로 고려한 결과 사용하는 영상과 표적 그리고 배경의 특성에 따라 적용성이 높은 알고리즘의 종류가 다른 것으로 나타났다. 따라서 초분광영상에 대한 기존 표적탐지 알고리즘의 적용성은 자료의 특성 및 배경과 표적의 공간적 분광적 관계에 따라 다르게 나타나므로, 사용하는 자료의 특성과 목적에 따라 적용하는 표적탐지 알고리즘의 종류가 달라질 필요가 있다.

• KSII Transactions on Internet and Information Systems (TIIS)
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• 제12권10호
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• pp.5079-5099
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• 2018

Regarding to the huge number of connections and the large flow of data on the Internet, Intrusion Detection System (IDS) has a difficulty to detect attacks. Moreover, irrelevant and redundant features influence on the quality of IDS precisely on the detection rate and processing cost. Feature Selection (FS) is the important technique, which gives the issue for enhancing the performance of detection. There are different works have been proposed, but a map for understanding and constructing a state of the FS in IDS is still need more investigation. In this paper, we introduce a survey of feature selection algorithms for intrusion detection system. We describe the well-known approaches that have been proposed in FS for IDS. Furthermore, we provide a classification with a comparative study between different contribution according to their techniques and results. We identify a new taxonomy for future trends and existing challenges.

• 한국게임학회 논문지
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• 제1권1호
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• pp.42-48
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• 2001

Collision is a brief dynamic event consisting of the close approach of two or more objects or particles resulting in an abrupt change of momentum or exchange of energy because of interaction. Collisions play very important role in computer graphics, computer games and animations fields. Collisions can supply active interaction between cyberspace and real world and give much interests for making nice games so reasonable collision detection algorithms are needed. Collision detection algorithms should satisfy being fast and accuracy. In this paper, we survey the 2D collision detection algorithms between geometric models. We present several methods and system available for collision detection.

• International Journal of Fuzzy Logic and Intelligent Systems
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• 제13권4호
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• pp.284-290
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• 2013

Feature detection is very important to image processing area. In this paper we compare and analyze some characteristics of image processing algorithms for corner and blob feature detection. We also analyze the simulation results through image matching process. We show that how these algorithms work and how fast they execute. The simulation results are shown for helping us to select an algorithm or several algorithms extracting corner and blob feature.

• 산업경영시스템학회지
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• 제47권1호
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• pp.9-19
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• 2024

Deep learning-based computer vision anomaly detection algorithms are widely utilized in various fields. Especially in the manufacturing industry, the difficulty in collecting abnormal data compared to normal data, and the challenge of defining all potential abnormalities in advance, have led to an increasing demand for unsupervised learning methods that rely on normal data. In this study, we conducted a comparative analysis of deep learning-based unsupervised learning algorithms that define and detect abnormalities that can occur when transparent contact lenses are immersed in liquid solution. We validated and applied the unsupervised learning algorithms used in this study to the existing anomaly detection benchmark dataset, MvTecAD. The existing anomaly detection benchmark dataset primarily consists of solid objects, whereas in our study, we compared unsupervised learning-based algorithms in experiments judging the shape and presence of lenses submerged in liquid. Among the algorithms analyzed, EfficientAD showed an AUROC and F1-score of 0.97 in image-level tests. However, the F1-score decreased to 0.18 in pixel-level tests, making it challenging to determine the locations where abnormalities occurred. Despite this, EfficientAD demonstrated excellent performance in image-level tests classifying normal and abnormal instances, suggesting that with the collection and training of large-scale data in real industrial settings, it is expected to exhibit even better performance.

• 한국항공운항학회지
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• 제19권4호
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• pp.83-90
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• 2011

The evaluation of Conflict detection and Resolution Algorithms require the use of analytical that describe encounter flight safety and the costs and benefits of optimization maneuver. A number of such algorithms have been applied in the past to the free flight. Each algorithm has benefits and limitations, and flight safety may be facilitated by combining the best features of various techniques. This paper studied a summary of conflict detection and resolution algorithm approaches. Algorithm techniques are categorized and the fundamental assumptions, capabilities, and limitations of each approach are described. The Algorithms are evaluated and compared based on their applicability to free flight airspace conflict situations.

• ETRI Journal
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• 제44권4호
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• pp.654-671
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• 2022

Accidental falls frequently occur during activities of daily living. Although many studies have proposed various accident detection methods, no high-performance accident detection system is available. In this study, we propose a method for integrating data and accident detection algorithms presented in existing studies, collect new data (from two stunt performers and 15 people over age 60) using a developed wearable device, demonstrate new features and related accident detection algorithms, and analyze the performance of the proposed method against existing methods. Comparative analysis results show that the newly defined features extracted reflect more important risk factors than those used in existing studies. Further, although the traditional algorithms applied to integrated data achieved an accuracy (AC) of 79.5% and a false positive rate (FPR) of 19.4%, the proposed accident detection algorithms achieved 97.8% AC and 2.9% FPR. The high AC and low FPR for accidental falls indicate that the proposed method exhibits a considerable advancement toward developing a commercial accident detection system.

• 한국컴퓨터정보학회논문지
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• 제16권1호
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• pp.71-80
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• 2011

본 논문에서는 퍼지추론을 기반으로 얼굴검출 알고리즘을 지능적으로 선택함으로써 개발자들이 전문적인 지식이 없이 얼굴검출 기능을 손쉽게 사용할 수 있는 새로운 기법을 제안한다. 본 논문의 목적은 퍼지추론 기반의 고차원 얼굴검출 시스템을 제시함으로써 사용자들이 컴퓨터비전 이론이나 개별 알고리즘들에 대한 전문적인 지식이 없어도 손쉽게 얼굴검출 기능을 포함하는 시스템을 개발할 수 있도록 지원하는데 있다. 얼굴검출의 방대한 문제영역을 분류하기 위해서 가장 먼저 얼굴검출을 위한 주요한 조건들을 고려하고 정리하였다. 이렇게 정리된 조건들은 개발자들이 주어진 문제를 표현하는데 사용할 수 있도록 정의되었다. 정의된 조건들과 사용 가능한 얼굴검출 알고리즘들은 퍼지추론 규칙을 이용하여 규칙화 되고 퍼지추론 해석기를 구성한다. 개발자들에 의해서 개별 문제의 조건들이 정리되면, 제안된 퍼지해석기가 퍼지추론을 통해 이에 대응되는 문제를 해결하기 위한 최적을 알고리즘들을 찾아내고 구성한다. 제안된 방법의 개념검증을 위해 기존의 알고리즘들과 성능을 비교하였으며 이를 분석하고 우수성과 실용성을 보여준다.