Document Camera Technology Features-- Contrast measurement Auto Focus

A document camera or visualizer's contrast measurement auto focus is a feature which helps a document camera display an image with the best contrast possible. Contrast auto focus is a feature that is frequently found in cameras and video cameras which do not have shutters. Contrast inside a sensor field is measured via the document camera's lens. The difference in intensity between pixels next to each other on the sensor is increased as the image is focused correctly, which means that the document camera's optical system can be adjusted until the maximum contrast is detected.