Research On 3D Reconstruction Method Of Electric Power Fittings Based On X-ray Detection Images

X-ray detection technology has been widely used in non-destructive testing of electric power equipment at present,but from the perspective of detection effect,there is still much space for development.An X-ray inspection result in a two-dimensional figure inside the device,and the power device itself is a three-dimensional space.The two-dimensional projection image obtained by the X-ray detection system is used to reflect the situation of the three-dimensional object,but there are limitations in the visual display.Therefore,the reduction of two-dimensional images into three-dimensional structures of power equipment through three-dimensional reconstruction technology is of great significance for X-ray detection of power equipment.In this paper,a new method for three-dimensional reconstruction based on X-ray images of electric power fittings is proposed.Above all,the overall scheme of the method is presented.The electric power fittings are used as the solid model to obtain the two-dimensional X-ray image,and then the image matching,camera calibration,three-dimensional coordinate calculation and three-dimensional surface reconstruction are performed in sequence.The method of obtaining the three-dimensional point coordinates of the electric power fitting is studied.The specific method is as follows: First,an electric power fitting is placed on a rotating platform,and an X-ray camera is used to capture a plurality of X-ray sequence images of the electric power fitting rotating when the platform rotating.By using the Sift algorithm,the corresponding contour feature matching relationship of two adjacent X-ray images is calculated and obtained.Then the basic matrix is calculated according to the matching relationship.Then,the initial value of the parameter in the X-ray non-destructive testing device is estimated according to the basic matrix.Finally,based on the improved Kruppa equation self-calibration algorithm to optimize the internal parameters,the X-ray image is reconstructed from the calibration parameters.Combined with the calibrated camera parameters and the corresponding coordinates of the matching points,the outer parameter matrix is calculated,and the three-dimensional point coordinates and the projection matrix of the corresponding points between the two images are obtained.Based on the three-dimensional point coordinate calculation method of two images,the matching calculation of multiple sequence images is carried out to obtain the spatial three-dimensional point coordinates of the electric power fitting.A three-dimensional surface reconstruction method is studied based on thethree-dimensional point coordinates of multiple sequence images.The method first sorts the three-dimensional reconstruction contour lines,then selects different interpolation functions for different surfaces to perform surface interpolation,and finally draws the surface.The experimental results show that the method successfully reconstructs the surface model of the three-dimensional bowl hanging plate,and compares the shape and key dimension error to verify the feasibility of the method.Meanwhile,the advantages of this method are low cost and high efficiency,and good application value in realizing the visualization of the detection results of power equipment is shown.