In order to realize automatic calibration of the camera used in morphology measurement of axisymmetric body

the perspective projection characteristics of the axisymmetric bodys are investigated

and an automatic intrinsic and extrinsic parameter calibration method of the measureing camera is proposed based on self constraint characteristics of measured axisymmetric body. First

utilizing the ease of extration of the section fetures

the ellipses of the image of the axisymmetric body cross sections are estimated

and used to cauculate the images of the circular points. Combining with the epipolar constraint

the full constraint equations of the image of absolute conic are established. Once the image of absolute conic is computed

the camera intrinsic parameters are obtained by Cholesky’s factorization. Second

the extrinsic parameter equations are established using the image of the symmetry axis and cross sections based on the intrinsic matrix of the camera and the extrinsic parameters are solved. Experimental results indicate that the relative precision of the cauculated intrinsic parameters is better than 0.95% and the extrinsic parameters 5.6%. It utilizes only the axisymmetric constraints of the measured object without the calibration plate or block. The calibration process is simple and effective

can satisfy the real needs.