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Item Distance Measurement Using Single Non-metric CCD Camera(2007-08-26) T.-H. Wang; M.-C. Lu; W.-Y. Wang; C.-Y. TsaiA novel measuring system based on a single non-metric CCD camera and a laser projector is proposed in this paper for measuring distance of a remote object. The setup of the measuring system is relatively easy, in which the laser pointer is positioned beside the CCD camera so that laser beam projected is parallel to the optical axis of the camera in a fixed distance. Based on a fast and effective algorithm proposed in this paper, the central position of the projected laser spot in images due to the laser beam can be accurately identified for calculating the distance of a targeted object according to an established formula. Because of the relationship of pixels counts of the diameter of the laser spot at different distances, processing of a sub-frame comprising a fraction of scan lines, rather than the whole image, is only required. Significant savings of computation time can therefore be achieved. Simulation results show satisfactory measurements can be obtained, where averaged absolute measurement errors via the proposed approach lie within 0.502%.Item Improvements and Applications of the Image-Based Distance Measuring System(2007-01-19) Ming-Chih Lu; Chen-Chien Hsu; Yin Yu LuThe paper presents practical improvements on the Image-Based Distance Measuring System, achieving the capability of 3-dimensional measurement of distant objects. The configuration of the proposed measurement is very simple, consisting of only a single CCD camera and two laser projectors formed in parallel. Because of the disposition of the laser projectors and the CCD camera, two laser-projected spots will appear on the same scan line of CCD images. Based on an established relationship between pixel counts and photographing distance, 3-D measurement and area information of distant objects can be obtained by using only one scan line in the image frame.Item A Practical Nighttime Vehicle Distance Alarm System(2008-10-15) Ming-Chih Lu; Wei-Yen Wang; Chen-Chien Hsu; Yin Yu Lu; Cheng-Pei TsaiThis paper presents a practical nighttime vehicle distance measuring method based on a single CCD image. The method combines an image-based distance measuring system. To solve the nighttime feature extraction problem, the proposed method uses two taillights as the feature. Based on the proportionality of similar triangles, distance between a CCD camera and the taillights of the vehicle ahead can be measured. The method focuses on detecting the taillights and differentiating the targeted vehicle from others on the basis of partial image analysis instead of whole image processing. The system is both fast and simple. The accuracy of the proposed method is demonstrated in this paper through experiences.Item Three-dimensional measurement of a remote object with a single CCD camera(2007-08-26) Cheng-chuan Chen; Chen-Chien Hsu; Ti-ho Wang; Chun-Wei HuangThis paper presents a novel method by regulating the height of a CCD camera to measure the width and height of a targeted object. That is, three-dimensional measurement can be obtained with the use of a single CCD camera. To facilitate the measurement using various kinds of CCD cameras, parameters pertinent to the cameras can be established via a proposed mechanism in this paper. As a result, any kinds of CCD cameras can be used to perform three dimensional measurement of a targeted object via software implementation of the proposed measuring method. No changes to the circuits or structure of the camera are required.Item Three-Dimensional Measurement of a Remote Object with a Single CCD Camera(2009-02-12) Ti-Ho Wang; Chen-Chien Hsu; Chun-Wei Huang; Yu-Ching LuThis paper presents a novel method by regulating the height of a CCD camera to measure the width and height of a targeted object. That is, three-dimensional measurement can be obtained with the use of a single CCD camera. To facilitate the measurement using various kinds of CCD cameras, parameters pertinent to the cameras can be established via a proposed mechanism in this paper. As a result, any kinds of CCD cameras can be used to perform three dimensional measurement of a targeted object via software implementation of the proposed measuring method. No changes to the circuits or structure of the camera are required.Item A Practical Nighttime Vehicle Distance Alarm System(2008-10-15) M.-C. Lu; C.-P. Tsai; W.-Y. Wang; M.-C. Chen; C.-C. Hsu; Y. Y. LuThis paper presents a practical nighttime vehicle distance measuring method based on a single CCD image. The method combines an image-based distance measuring system. To solve the nighttime feature extraction problem, the proposed method uses two taillights as the feature. Based on the proportionality of similar triangles, distance between a CCD camera and the taillights of the vehicle ahead can be measured. The method focuses on detecting the taillights and differentiating the targeted vehicle from others on the basis of partial image analysis instead of whole image processing. The system is both fast and simple. The accuracy of the proposed method is demonstrated in this paper through experiences.Item 2-Dimenional Localization Based on Tilt Photographing of a Single CCD Camera(2009-02-12) Ming-Yu Cheng; Chen-Chien Hsu; Pei-Jun LeeThis paper provides an image-based localization method based on tilt photographing of a single CCD camera. Image captured by the CCD camera is pre-processing to locate the target object in the picture in terms of pixel count deviation from the CCD camera. By using an established formula based on relationship between tilt angle of the CCD camera and distance, coordinate of the target object can be calculated. Experiment results have demonstrated that the feasibility of the proposed approach with satisfactory accuracy in determining the position of the target object.