In this paper

a method is proposed for projector calibration in 3D photography systems using grating projection.An image with intersection lines between grating planes and a known objective plane can be captured by a digital camera.According to the image a pair of points can be extracted from each of intersection lines.If we move the known objective plane to known positions

we can get more pairs of points belonging to the same plane.At the last

every grating plane equation can be approached with Least Square Fit Algorithm based all corresponding sample 3D points on it.