A Study on Master-Slave Imaging System and Application for Ecological Monitoring
Date Issued
2012
Date
2012
Author(s)
Yu, Shih-Jhong
Abstract
Video surveillance has been widely used in various applications. The master-slave imaging system architecture can provide both a large field of view (FOV) and high resolution images. A master camera is responsible for monitoring large FOV, object detection, and guiding the slave camera. A slave camera is usually a pan-tilt-zoom (PTZ) camera, which rotates and zooms in to acquire high resolution images of targeted objects. In traditional approach, a camera with wide angle or fish-eye lens is usually used as the master camera. However, such an approach is limited in applications requiring high resolution image. Instead, we propose a new kind of master camera, which is a panoramic camera set integrated with eight webcams. We employ the panorama technology to provide video images with large FOV, low image distortion and high resolution simultaneously. Moreover, we develop a new geometrical mapping method to achieve coordinate transformation between the panoramic camera set and the PTZ camera. We also apply the interactive multiple model to improve the estimation of the targeted object state, which facilitates the PTZ camera to center on the targeted object for proper image acquisition. The proposed system has been applied to pedestrian and ecological pool monitoring to test its performance. The developed master-slave imaging system provides high resolution images and the trajectory of the targeted objects. The panoramic camera is capable of acquiring video images of 4390 × 587 resolution at rate of 10 fps. The mapping error is around 0.5 degree. The overall tracking rate is about 70%. The high resolution images and the recorded trajectories are useful in further analyses of the behaviors of targeted objects.
Subjects
Master-slave imaging system
Panoramic Camera
PTZ camera
Ecological monitoring
Type
thesis
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