3D Modeling of Small Ancient Keramics Based on the Projector-Camera System

The paper proposes a flexible and practical method to 3D model the ancient keramics based on the projector-camera system. The projector-camera system is composed of a slide projector, a digital camera, a control ground and a computer. The computer controls other three equipments working together automatically and efficiently. The control ground is a planar grid on the centre of a rotating platform. According to the size of the planar grid, the target ancient keramics is relatively small. The planar grid is functioned as the calibration of the slide projector and the digital camera. After calibrated respectively in advance, the projector-camera system is similar with the binocular vision system in the principle of 3D reconstruction. The digital camera takes two images of small ancient keramics with the projected texture characteristic and without it at one time. The two sequential images are taken from the different orientations. 3D coordinates of the space feature point can be computed by the space forward intersection. Using the whole adjustment, 3D coordinates of all space points projected on the whole surface of the target small ancient keramics from the different orientations can be worked out accurately. 3D model of the target small ancient keramics is acquired by connecting all neighbor space feature points and the real texture is rendered from relative images without the projected texture characteristic. 3D modeling of small ancient keramics is achieved entirely and finally. 3D modeling of small ancient keramics proposed in the paper is confirmed to be correct and effective completely by the results of the modeling experiments.