Development Of Automatic Viewing Platform Supporting 3D Reconstruction Of Cultural Relics

Cultural relics are precious treasures left by the ancients and have extremely high historical,artistic,and scientific values.The protection of cultural relics is to protect humankind civilization,and is conducive to the construction of social spiritual civilization and the improvement of citizen's living standards.At present,the majority of the images required for 3D reconstruction of cultural relics are captured manually,which wastes time and effort.It is difficult for the photographer to control the camera's posture to cover the panoramic view of the cultural relics,resulting in taking a large number of pictures but still missing key perspectives of the historical relic.It led to the failure of the reconstruction of artifacts.The accurate reconstruction of the cultural relics required operator to have rich experience in adjusting parameters of the light source and camera.These factors limit the application and promotion of 3D reconstruction of cultural relics.In view of the shortcomings of traditional manual shooting,this paper developed an automatic viewing device that supports 3D reconstruction of cultural relics,developed related control's software to automatically obtain two-dimensional images of different angles of view of the cultural relics and panoramic view of covered artifacts,achieved the automatic adjustment of the best light intensity vector in multi-channel lighting,and finally achieved automatic viewing of the artifacts and 3D reconstructions.The main research work and achievements are as follows:(1)A five-axis motion control platform based on PC-motion controller was designed to achieve continuous 360° rotation angle control of the stage and precise control of the camera's shooting position.A 4-channel light source lighting architecture was adopted,and the platform basing on the Modbus TCP communication protocol achieved the PC's lighting intensity control of the light source.(2)For the non-linearity of multi-channel illumination intensity and the different optimal illumination conditions required for different characteristic artifacts,illumination experiments of different artifacts were carried out,and an imaging quality evaluation mechanism based on image information entropy was established.Designing the optimal program automatically adjusting the optimal light intensity based on the characteristics of different cultural relics achieved satisfactory shooting results.(3)In view of the phenomenon of image distortion caused by lens' distortion,the camera calibration method was studied and the distortion image was corrected,which effectively improved the accuracy of the artifact image.Finally,by extracting the disparity map of the adjacent image,the 3D reconstruction of the cultural relics is achieved through the stereo matching principle.The developed automatic viewing device has been officially put into use.Through the development of the host computer control software,the multi-angle and multi-pose automatic shooting of the cultural relics has been achieved.Finally,the 3D model of the object to be built is acquired,and the 3D reconstruction of the cultural relics is quickly and accurately implemented.The foundation of the application and promotion of the 3D reconstruction of the cultural relics is laid.