In the X-ray CT imaging inspection system

due to the complicated structure of complex shaped workpieces

scattering

hardening and other phenomena are more serious.At some projection angles

due to the large difference in effective thickness in the ray transillumination direction

the fixed energy ray dose does not match the thickness

the quality of the projection data is poor

the reconstructed image obtained by the traditional CT reconstruction algorithm is of low quality

the edges are blurred

and the complete contour information of the workpiece cannot be obtained.In this paper

a CT imaging method for complex shaped workpieces based on contour prior constraints is studied.Firstly

the binocular stereo vision technology is used to obtain the contour information of the workpiece

and the registration of the a priori image is completed according to the spatial positional relationship between the binocular coordinate system and the CT coordinate system.The contour prior is then incorporated into the CT reconstruction process and contour constrained reconstruction is performed in conjunction with TV (Total-variation) regularization.The experimental results show that the proposed method can effectively suppress artifacts and noise

preserve the edges of reconstructed images

improve the quality of reconstructed images

and improve the reliability of defect detection of complex shaped workpieces.