Image processing systems and methods

A whiteboard image capture system has a camera configured to capture an image of the whiteboard viewed from an acute angle; and a linear polariser having a plane substantially perpendicular to a plane of the whiteboard and having an axis of polarisation substantially perpendicular to the plane of the whiteboard or within 30° of the perpendicular to the plane of the whiteboard. The camera is configured to capture the image of the whiteboard through the polariser; and a normal to the polariser is directed in a different direction to a direction defined by an optic axis of the camera. The camera may have a rectilinear lens. The system may filter data from the image frames to remove parts of the image frames corresponding to parts of a user or user pen writing or drawing on the whiteboard. The polariser may be curved about an axis perpendicular to the plane of the whiteboard (figure 6b).