Bundle Adjustment of Airborne Three Line Array Imagery Based on Unit Quaternion
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In this paper the unit quaternion is used as a substitute for describing the attitude of a camera to overcome the limitation of Euler angles on the description and interpolation of orientation,corresponding collinearity equation is then derived and linearized.At the same time the Spherical linear Interpolation(Slerp) of unit quaternion is introduced into the bundle adjustment of three line array imagery with orientation image method.By making use of Slerp formula to accomplish uniform interpolation of camera attitude on the sample cycles between two orientation images,new mathematic model based on unit quaternion for the reconstruction of the exterior orientation of three line array images is set up and then linearized with respect to the exterior orientation parameters of adjacent orientation images.Two ADS40 datasets have been used for validating related algorithms proposed in this paper.Experimental results show that bundle adjustment with orientation image method described by Slerp achieves the accuracy of about one pixel both in plane and height direction when locating a full control point at each corner of the block.It provides us an ideal technical approach for the calibration and triangulation of three line array CCD sensor.