【摘要】 提出了一种以数字视频监控系统为平台,利用摄像机标定技术和空间分析中可视域分析对林火进行自动定位的方法。根据摄像机系统前端监控点的硬件组成及其成像原理,分别建立了前端监控点空间模型和中心透视投影模型。利用Matlab中Camera CalibrationToo-lbox对定焦摄像机的关键参数进行标定,求出其内方位元素和图像畸变系数,结合ArcGIS Engine通视性分析中的相关方法,实现了对单目摄像机单幅图像上任意位置火点的自动定位。更多还原

【Abstract】 To raise the efficiency of finding and determining the point of the forest fire through the image resolution,the present paper intends to offer a novel positioning method by using the camera calibration technology and visual domain analysis in the spatial analysis.The method we have proposed can be said superior over the other existing methods,such as single-point positioning,the system space model and the central perspective projection model in that our method is cheaper and higher in real-time positioning efficiency in comparison with other instruments of air monitoring and ground monitoring.For the above said advantages,we have established the system space model and the central perspective projection model in this paper in accordance with the hardware components of the front-end monitoring points and the camera imagining principle.And,then,we are trying to use the Camera Calibration Toolbox in Matlab to calibrate the camera to calculate the intrinsic parameters and image distortion coefficients and locate simulated forest fire points in combination with the visibility analysis achieved by ArcGIS Engine.In so doing,the new positioning method can help to realize automatic positioning of the fire point anywhere in one image of the monocular camera.And,finally,six experimental points have been chosen as the simulation points at Jiufeng Mountain in Beijing,to implement the contrast experiment.The locations of these simulated points have been measured by GPS.The positioning results worked out by using the new positioning method prove to be in close conformity with the measured values of GPS with minor errors.Thus,the method we have developed can provide a set of practical solutions to the forest fire location to the forest which has been included in the digital video surveillance system.更多还原