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A Fall Detection Technique using Features from Multiple Sliding Windows
Pant, Sudarshan,Kim, Jinsoo,Lee, Sangdon THE KOREAN INSTITUTE OF SMART MEDIA 2018 스마트미디어저널 Vol.7 No.4
In recent years, falls among elderly people have gained serious attention as a major cause of injuries. Falls often lead to fatal consequences due to lack of prompt response and rescue. Therefore, a more accurate fall detection system and an effective feature extraction technique are required to prevent and reduce the risk of such incidents. In this paper, we proposed an efficient feature extraction technique based on multiple sliding windows and validated it through a series of experiments using supervised learning algorithms. The experiments were conducted using the public datasets obtained from tri-axial accelerometers. The results depicted that extraction of the feature from adjacent sliding windows led to high accuracy in supervised machine learning-based fall detection. Also, the experiments conducted in this study suggested that the best accuracy can be achieved by keeping the window size as small as 2 seconds. With the kNN classifier and dataset from wearable sensors, the experiments achieved accuracy rates of 94%.
Obstacle Avoidance Method for UAVs using Polar Grid
Sudarshan Pant,Sangdon Lee 한국멀티미디어학회 2020 멀티미디어학회논문지 Vol.23 No.8
This paper proposes an obstacle avoidance method using a depth polar grid. Depth information is a crucial factor for determining the safe path for col ision-fre navigation of unmanned aerial vehicles (UAVs) as it can perceive the distance to the obstacles ef ectively. However, the existing depth-camera-based approaches for obstacle avoidance require computational y expensive path planning algorithms. We propose a simple navigation method using the polar-grid of the depth information obtained from the camera with nar ow field-of-view(FOV). The ef ectivenes of the approach was validated by a series of experiments using software-in-the-loop simulation in a realistic outdoor environment. The experimental results show that the proposed approach suc es ful y avoids obstacles using a single depth camera with limited FOV
Design and Implementation of a CAN Data Analysis Test Bench based on Raspberry Pi
Sudarshan Pant,이상돈 한국멀티미디어학회 2019 The journal of multimedia information system Vol.6 No.4
With the development of Cyber-Physical Systems(CPS), several technologies such as automation control, automotive and intelligent house systems have been developed. To enable communication among various components of such systems, several wired and wireless communication protocols are used. The Controller Area Network(CAN) is one of such wired communication protocols that is popularly used for communication in automobiles and other machinery in the industry. In this paper, we designed and implemented a response time analysis system for CAN communication. The reliable data transfer among various electronic components in a significant time is crucial for the smooth operation of an electric vehicle. Therefore, this system is designed to conveniently analyze the response time of various electronic components of a CAN enabled system. The priority for transmission of the messages in the CAN bus is determined by the message identifier. As the number of nodes increases the transmission of low priority messages is delayed due to the existence of higher priority messages on the bus. We used Raspberry Pi3 and PiCAN2 board to simulate the data transfer for studying the comparative delay in low priority nodes.
User Behavior Analysis for Visual Music Notation
Sudarshan Pant,Sangdon Lee,Hyung-Dae Koh,Tae-Hak Roh 한국멀티미디어학회 2011 한국멀티미디어학회 국제학술대회 Vol.2011 No.-
Music representation is one of the major concerns in the field of content based music retrieval. For efficient retrieval of music the user’s request needs to be represented in such a way that it is both convenient to use and flexible to express his demand. There are diverse methods of representing users music requests used for retrieval purposes. Visual music representation is an approach to describe users’ music requests graphically. This paper presents user behavior analysis for visual representation of music. The results are based on a survey carried out using different genres of music samples with different complexity and length. The survey was conducted upon users with different music perception levels classified into two groups. The experiment shows that music can be effectively expressed as a series of visual patterns and can be used to describe user request for retrieval of music data.
Vanishing Point Detection using Reference Objects
이상돈,Sudarshan Pant 한국멀티미디어학회 2018 멀티미디어학회논문지 Vol.21 No.2
Detection of vanishing point is a challenging task in the situations where there are several structures with straight lines. Commonly used approaches for determining vanishing points involves finding the straight lines using edge detection and Hough transform methods. This approach often fails to perform effectively when there are a lot of straight lines found. The lines not meeting at a vanishing point are considered to be noises. In such situation, finding right candidate lines for detecting vanishing points is not a simple task. This paper proposes to use reference objects for vanishing point detection. By analyzing a reference object, it identifies the contour of the object, and derives a polygon from the contour information. Then the edges of the detected polygon are used to find the vanishing points. Our experimental results show that the proposed approach can detect vanishing points with comparable accuracy to the existing edge detection based method. Our approach can also be applied effectively even to complex situations, where too many lines generated by the existing methods make it difficult to select right lines for the vanishing points.
A Visual Notation for Music Representation
Sangdon Lee,Sudarshan Pant,Jongmyung Choi,Seokwon Jung,Sangil Lee,Sook Yoon,Youngho Lee,Hyungdae Koh,Yangki Oh,Hyun Kyung Cho 한국멀티미디어학회 2010 한국멀티미디어학회 국제학술대회 Vol.2010 No.-
There has always been a popular demand for effective retrieval of music data by users. In order to make music retrieval more effective, music needs to be represented in an effective way. In this paper we propose a visual method of representing music input by users for effective retrieval of music from database. It enables users to express their description of music requests in a more convenient way than the previous ones. The proposed visual representation of music can be used to express users' demand for content-based music retrieval. This paper illustrates the effectiveness of the proposed approach by applying it to a content-based music retrieval system for Korean folk music database.
Vanishing Point Detection using Reference Objects
Lee, Sangdon,Pant, Sudarshan Korea Multimedia Society 2018 멀티미디어학회논문지 Vol.21 No.2
Detection of vanishing point is a challenging task in the situations where there are several structures with straight lines. Commonly used approaches for determining vanishing points involves finding the straight lines using edge detection and Hough transform methods. This approach often fails to perform effectively when there are a lot of straight lines found. The lines not meeting at a vanishing point are considered to be noises. In such situation, finding right candidate lines for detecting vanishing points is not a simple task. This paper proposes to use reference objects for vanishing point detection. By analyzing a reference object, it identifies the contour of the object, and derives a polygon from the contour information. Then the edges of the detected polygon are used to find the vanishing points. Our experimental results show that the proposed approach can detect vanishing points with comparable accuracy to the existing edge detection based method. Our approach can also be applied effectively even to complex situations, where too many lines generated by the existing methods make it difficult to select right lines for the vanishing points.