CORRELATION DETECTOR FOR IMAGES

摘要

A correlation detector for images including: a unit for converting pixel signals of two images into digital data; a unit for deriving either an absolute value of a difference between the two pixel signals or a product of the two pixel signals from a table in accordance with pixel signal values of the two images; a unit for converting the derived value into an analog value; and a unit for storing electric charges while converting the converted analog value into a current value which is proportional to the converted analog value. Since the correlation between the two images are calculated using a table and the addition is performed in terms of storing electric charges, the correlation detector can be down-sized with simple circuits and its operation speed is improved as well.