Author: search.filters.author.Chen-Chien Hsu

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Now showing 1 - 10 of 58
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    Image-Based System for Measuring Objects on an Oblique Surface
    (2010-05-06) Chen-Chien Hsu; Wei-Yen Wang; Yin-Yu Lu; Ming-Chih Lu
    This paper presents an image-based framework for measuring target objects on an oblique plane by using a single CCD camera and two parallel laser projectors beside the camera. Because of the alignment of the laser beams which form in parallel with the optical axis, projected spots in the image can be processed to establish relationships between distance and pixel counts between the projected spots in the image. Based on simple geometrical derivations without complex image processing, the proposed approach can measure the photographing distance, the distance between two arbitrary points on the oblique surface, and the incline angle. Experiment results have demonstrated the effectiveness of the proposed approach in measuring distant objects on an oblique plane.
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    Diameter and Depth Measurement of Holes by a Single Camera
    (World Scientific and Engineering Academy and Society (WSEAS), 2007-05-01) Chin-Tun Chuang; Ming-Chih Lu; Chen-Chien Hsu; Yin-Yu Lu
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    Localization of Mobile Robots via an Enhanced Particle Filter
    (2010-05-06) Chen-Chien Hsu; Ching-Chang Wong; Hung-Chih Teng; Nai-Jen Li; Cheng-Yao Ho
    A self-localization method entitled enhanced particle filter incorporating tournament selection and Nelder-Mead simplex search (NM-EPF) for autonomous mobile robots is proposed in this paper. To evaluate the performance of the localization scheme, an omnidirectional vision device is mounted on top of the robot to analyze the environment of a soccer robot game field. Through detecting the white boundary lines relative to the robot in the game field, weighting for each particle representing the robot's pose can be updated via the proposed NM-EPF algorithm. Because of the efficiency of the NM-EPF, particles converge to the correct location of the robot in a responsive way while tackling uncertainties. Simulation results have shown that efficiency in robot self-localization can be significantly improved while maintaining a relatively smaller mean error in comparison to that via conventional particle filter.
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    Distance Measurement Based on Pixel Variation of CCD Images
    (2009-02-12) Chen-Chien Hsu; Ming-Chih Lu; Ke-Wei Chin
    This paper presents a distance measurement method based on pixel number variation of images for digital cameras by referencing to two arbitrarily designated points in image frames. Based on an established relationship between the displacement of the camera movement along the photographing direction and the difference in pixel counts between reference points in the images, distance from an object can be calculated via the proposed method. To integrate the measuring functions into digital cameras, circuit design implementing the proposed measuring system in selecting reference points, measuring distance, and displaying measurement results on CCD panel of the digital camera is proposed in this paper. In comparison to pattern recognition or image analysis methods, the proposed measuring approach is simple and straightforward for practical implementation into digital cameras. Experiment results have demonstrated that the proposed method is capable of yielding satisfactory measurement results in a very responsive way.
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    Digital redesign of interval systems via particle swarm optimization
    (2008-08-15) Chen-Chien Hsu; Chun-Hwui Gao
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    Digital redesign of uncertain interval systems via a hybrid particle swarm optimizer
    (Inderscience, 2008-07-01) Chen-Chien Hsu; Chun-Hwei Kao
    In this paper, a hybrid optimiser incorporating particle swarm optimisation (PSO) and an enhanced NM simplex search method is proposed to derive an optimal digital controller for uncertain interval systems having an interval plant based on frequency-response resemblance. By combining the uncertain plant and controller, extremal systems for the redesigned digital system and its continuous counterpart can be obtained as the basis for comparison. The design problem is then formulated as an optimisation problem of an aggregated error function in terms of frequency-response deviation between the redesigned digital system and its continuous counterpart, and subsequently optimised by the proposed optimiser to obtain an optimal set of parameters for the digital controller. Thanks to the performance of the proposed hybrid optimiser, frequency envelope of the redesigned digital system using the digital controller evolutionarily derived by the proposed approach bare a better resemblance to its continuous-time counterpart in comparison to those obtained using existing open-loop discretisation methods.
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    Intelligent Digital Redesign of T-S Fuzzy Controller via Particle Swarm Optimization
    (Serials Publications, 2011-07-01) Chen-Chien Hsu; Shu-Han Chu; Yi-Hsing Chien
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    Distance and Angle Measurement of Distant Objects on an Oblique Plane Based on Pixel Number Variation of CCD Images
    (Institute of Electrical and Electronics Engineers (IEEE), 2011-05-01) Chen-Chien Hsu; Ming-Chih Lu; Yin-Yu Lu
    This paper presents an image-based system for measuring target objects on an oblique plane based on pixel number variation of charge-coupled device images for digital cameras by referencing to two arbitrarily designated points in the image frame. Based on an established relationship between the displacement of the camera movement along the photographing direction and the variation in pixel counts between the reference points in the images, photographic distance and incline angle for objects lying on an oblique plane can be calculated via the proposed method. As a real-case application of the proposed approach, 2-D localization of target objects in robot soccer competitions is also demonstrated to show the effectiveness of the proposed approach. To allow the use of widely available digital zoom cameras for ranging and localization by the proposed method, a parameter equivalent to the displacement due to the camera movement is also investigated and derived in this paper.
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    Three Dimensional Measurement Based on Image Shift and Its Applications
    (World Scientific and Engineering Academy and Society (WSEAS), 2007-05-01) Ti-Ho Wang; Ming-Chih Lu; Chen-Chien Hsu; Yin-Yu Lu; Cheng-Pei Tsai