Control Systems

Download Automatic Calibration and Reconstruction for Active Vision by Beiwei Zhang PDF

By Beiwei Zhang

In this booklet, the layout of 2 new planar styles for digital camera calibration of intrinsic parameters is addressed and a line-based process for distortion correction is advised. The dynamic calibration of dependent gentle platforms, which encompass a digicam and a projector is usually taken care of. additionally, the 3D Euclidean reconstruction through the use of the image-to-world transformation is investigated. finally, linear calibration algorithms for the catadioptric digital camera are thought of, and the homographic matrix and basic matrix are commonly studied. In those equipment, analytic strategies are supplied for the computational potency and redundancy within the info should be simply integrated to enhance reliability of the estimations. This quantity will hence turn out worthy and useful device for researchers and practioners operating in picture processing and desktop imaginative and prescient and similar subjects.

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Under the perspective projection, the corresponding h7 h8 h9 ˜c are related by ˜p and m points m ˜p = λH m ˜c m where λ is a scale factor. 9) 30 2 System Description Fig. 9), each pair of corresponding points provides two constraints on the Homography. Hence, four pairs are sufficient for the estimation. If more than four pairs are available, the Homography can be determined in the least squared sense. T T ˜ p,i = [u i v i 1] . In the ˜ c,i = [ui vi 1] and m Let the i-th pair of points be m follows, we talk about two standard linear methods for solving it.

Since there are five parameters in this model, it is referred to as a linear five-parameter camera. The ratio of f u and f v is often called the aspect ratio of the camera. With a modern camera, the skew can be treated as zero (s = 0) which means the pixels in the image can be assumed to be rectangular. In this case, the model is referred to as a four-parameter camera. For a camera with fixed optics, these parameters are identical for all the images taken with the camera. For a camera which has zooming and focusing capabilities, the focal lengths can obviously change.

F1 f2 f3 Let F = ⎣f4 f5 f6 ⎦. Its row-first vector is f = (f1 , f2 , f3 , f4 , f5 , f6 , f7 f8 f9 f7 , f8 , f9 )T . Let the coordinates of mc and mp be set as in the previous section. 16) where A represents the coefficient matrix. The solution for the vector f can be determined up to a scale factor using eigenvalue decomposition. And so is the fundamental matrix F . 17) i Remark The fundamental matrix describes the mutual relationship between any two images of the same scene. It has found various applications in computer vision.

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