The Research Of Annular Screen In Cammera Calibration

Camera calibration is the key step of getting three-dimensional information from planar image in computer vision, and it is widely used in three-dimensional rebuilding, navigation, cyber-stakeout, and etc. Camera calibration is largely researched and discussed in ICCV, ECCV, CVPR, ICPR, and relational important magazines recently, which is now becoming a hotspot in cyber-vision.One of the main contents in camera calibration is solving the inner-parameters of the camera. As to this part, there are about three classes. The first is the calibration based on the cube precisely processed; the second is the calibration based on active vision; the third is the auto-calibration being talked a lot now. The paper firstly do research in detecting and identifying the edge of the image, and after doing that, get the coordinate of the key point in planar picture. It proved that the inner-parameter of the camera unchanged, we can get the inner-parameter according the series of analyzing and mathematic counting. We take an annular screen as a research object in camera calibration. Because of the particularity of the annular screen, the image projected on the annular screen will distort. After analyze the reason and the physical environment, design the arithmetic of revising and carry out.