Visualiser is a real-time image capture devices for displaying an object to a large audience. A documentcamera is able to magnify and project the images of actual, three-dimensional objects, as well as transparencies. They are like high resolution web cams, mounted on arms to facilitate their placement over apage. This allows a teacher, lecturer or presenter to write on a sheet ofpaper or to display a twoor three-dimensional object while the audience watches. Most objects can be simply placedunder the camera. The camera takes the picture and produces a live picture using a projecton.