The invention relates to a method for linearly solving parameters in a parabolic
catadioptric camera through three unparallel straight lines in a
checkerboard. The method is characterized in that only linear elements are utilized, and a template is composed of the three unparallel straight lines on the
checkerboard; parabolic catadioptric images of the straight lines are quadratic curves, the parabolic
catadioptric camera is used for taking an image of a target, image points of the target are extracted from the image first, fitting is conducted to obtain the curve equation, and the intersection points of every two curves are solved, six sets of orthogonal
fading points on the
image plane are then obtained according to the geometric properties of a circle and the
cross ratio invariance property, and the parameters in the parabolic
catadioptric camera are linearly solved for constraints on images of the absolute quadratic curves through the orthogonal
fading points. According to the method, the target can be calibrated in a full-automatic mode, and errors caused by measurement in the calibration process are reduced. Due to the fact that the straight lines are the simpler and more comprehensive elements, calibration accuracy is improved in the calibration process of the camera.