Browsing by Author "Lin, Yi-Ting"

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A Survey of Intelligent Video Surveillance Systems: History, Applications and Future
(2015-01-01)
Fan, Chung-Shuo
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Liang, Jia-Ming
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Lin, Yi-Ting
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Wu, Kun-Ru
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Li, Kuan-Yi
With advances in wireless network infrastructure providing powerful support for surveillance video communications, it is practical to meet the needs of intelligent surveillance systems in a wide range of applications. This survey offers a comprehensive overview of state-of-the-art technologies for intelligent video surveillance systems so as to provide researchers in this field with a summary of the progress achieved to date. The evolution of surveillance systems is outlined as well. In addition, the representative technologies for environment modeling, object classification, object tracking, behavioral analysis, and database implementation are summarized. Finally, we list several detailed discussions on possible future research directions.
A Web-based Camera Dispatch System for Video Surveillance with Dynamic Requirements
(2015-01-01)
Li, Kuan-Yi
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Liang, Jia-Ming
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Fan, Chung-Shuo
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Tseng, Yu-Chee
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Lin, Yi-Ting
Video surveillance systems are commonly used to monitor environments, such as factories, shopping malls, offices, and schools, for safety and security. However, traditional closed-circuit television cameras can only capture static scenes. When unexpected events happen, such as fire accidents or stranger intrusion, the recorded video data cannot provide immediate and precise information. In this work, we design a camera dispatch system for video surveillance with pan-tilt-zoom (PTZ) cameras, which can monitor event-areas/targets real-timely and flexibly. Users can dynamically define the monitoring requirements, such as pixel-per-foot and viewing-angle of the event-areas/targets. Then, a dispatch algorithm will decide the most necessary cameras and corresponding settings to monitor the event-areas/targets immediately. The control panel is implemented as a web-based service. The demo shows that users can easily monitor potential event-areas/targets anywhere, anytime through a web browser.
A Web-based, Real-time Video Surveillance System by Leveraging PTZ Cameras
(2015)
Li, Kuan-Yi
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Liang, Jia-Ming
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Fan, Chung-Shuo
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Wu, Kun-Ru
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Lin, Yi-Ting
Video surveillance systems are commonly used for environmental monitoring. Nevertheless, existing systems such as [1, 2] can only monitor scenes statically. When an accident or a fire event happens, we cannot get the critical pictures and check those situations immediately. Therefore, we propose to leverage pan-tilt-zoom (PTZ) cameras and develop a real-time surveillance system, where the PTZ cameras can rotate in a horizontal plane by panning and in a vertical plane by tilting, and adjust the focal length by zooming, so we can control these cameras dynamically for the emergent area. Especially for the accessibility, we implement this system as a web service to help users easily define the emergent area and preview the video of cameras remotely. Specifically, our system is composed of multiple PTZ cameras and a web server, as shown in Fig. 1. The PTZ cameras are with fixed positions and can be controlled to pan, tilt, and zoom remotely by the web server. The web server maintains a website to provide the real-time surveillance service, consisting of two procedures: area setting and video displaying. The area setting is for users to define the monitored area, including the range and location of the monitored area. Then, all the cameras will be dispatched and face to the center of the monitored area. Finally, the video displaying procedure will show the monitoring results, including the video streams and the rotation parameters of the dispatched cameras. Fig. 2 shows the control panel of the implemented prototype, where there are two PTZ cameras deployed in the monitoring environment. On this panel, the left part is for video displaying and the right part is for the monitored area setting. More specifically, for the right part, the upper side is the floor plan of the monitoring environment which users can define the location of the emergent area by clicking on. On the lower left side, users can further specify the details of the area, such as its length and width. After setting, the monitored area will be marked as the red-dotted rectangle on the floor plan. Finally, the monitoring results, such as the coverage ratio of the monitored area and the rotation parameters of the cameras, will be shown on the lower central side. Note that the system also allows users to control the cameras manually on the lower right side.
Algorithm Derivation and Its Embedded System Realization of Speed Limit Detection for Multiple Countries
(2016)
Lin, Yi-Ting
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Chou, Ting
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Vinay, M. S.
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Guo, Jiun-In
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電子工程學系及電子研究所
This paper proposes a low-complexity speed limit detection which can not only support different types of speed limit signs for multiple countries, but maintain good detection rate under inclement weathers. The proposed algorithm steps include shape detection to locate speed limit signs, adaptive threshold and digit recognition algorithm which can adapt to different digit fonts to support different types of speed limit signs for multiple countries. We implement the proposed algorithm on both the desktop and the automotive-grade i.MX 6 embedded system. Under D1 resolution (720x480), the proposed system can achieve 150 fps on the desktop and 30 fps on the i.MX 6 embedded system.
Application of a two-dimensional Butler matrix antenna array for tile-based beamforming
(2019-06-10)
Hsieh, Cheng-Hung
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Lin, Yi-Ting
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Jhan, Hsaing-Chieh
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Tsai, Zuo-Min
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電機工程學系
This paper proposes a new two-dimensional (2D) Butler matrix antenna array with 16 switching beams for tile-based beamforming. This study fabricated and assembled a 3.5-GHz Butler switching antenna array using multilayer Rogers printed circuit board technology. It adopted a new design concept and layer-by-layer vertical connection architecture. This 2D Butler matrix antenna array does not require long coaxial cables to connect functional circuit interfaces, which is an improvement over the traditional Butler matrix beamforming network (BFN) antenna array and may facilitate considerable reductions in circuit volume and complexity.
Smart Surveillance with Context and Location Sensitivity and Quality Control
(2016-01-01)
Wu, Kun-Ru
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Liang, Jia-Ming
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Zhang, Xin
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Li, Kuan-Yi
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Lin, Yi-Ting
Smart video surveillance systems are essentials in modern environments to ensure safety and security for lives and property. In order to capture critical clues of reconnaissance, it is important to automatically and dynamically control the surveillance sensitivity and quality for detecting abnormal/suspicious events to perform high quality monitoring. In this work, we design a smart video surveillance system, which fully utilizes pan tilt-zoom (PTZ) cameras and well integrates with environment sensors (such as fire/motion/door sensors) while cooperating with wearable devices that can adaptively monitor events and ensure the surveillance quality in terms of pixel-per-foot (PPF), viewing angles, timeliness, and accuracy. In addition, this system also supports to define the special monitoring tasks and surveillance requirements, such as the surveillance timeliness and duty cycle for particular moving objects to be tracked per time unit. Then, a smart camera dispatch algorithm will calculate and determine the best cameras set with the corresponding configurations to accomplish the surveillance tasks effectively and precisely. We will show how our system realizes smart detecting and monitoring in this demonstration by leveraging PTZ cameras, environmental sensors and wearable devices.
Solution-based silk fibroin dielectric in n-type C-60 organic field-effect transistors: Mobility enhancement by the pentacene interlayer
(2013-12-02)
Tsai, Li-Shiuan
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Hwang, Jenn-Chang
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Lee, Chun-Yi
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Lin, Yi-Ting
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Tsai, Cheng-Lun
A pentacene interlayer of 2 nm thick is inserted between fullerene (C-60) and the solution-based silk fibroin dielectric in C-60 organic field-effect transistors (OFETs). The pentacene interlayer assists to improve crystal quality of the C-60 layer, leading to the increase of field-effect mobility (mu(FE)) from 0.014 to 1 cm(2) V-1 s(-1) in vacuum. The mu(FE) value of the C-60 OFET is further enhanced to 10 cm(2) V-1 s(-1) when the OFET is exposed to air in a relative humidity of 55%. Generation of mobile and immobile charged ions in solution-based silk fibroin in air ambient is proposed. (C) 2013 AIP Publishing LLC.