Patent ID: 6094253
Filing Date: 2000-07-25
Classification: G03B

Abstract:
A microfilm search device for searching a desired frame from a microfilm by detecting the presence of frames from a density change in the running direction of the microfilm, comprising:an encoder for outputting a sampling signal for a predetermined feeding amount of the microfilm;plural density sensors for detecting the film density in different positions along a width direction within a frame travel width to output density signals;a binarizing section for binarizing the density signals into binarized signals, each of which has logic ZERO or logic ONE, in synchronization with said sampling signal;a determination section for detecting the presence of frames using only one of a logical product and a logical sum of the plural binarized signals to output a determination signal indicative of the presence of the frame; anda searching section for searching for the desired frame based on said determination signal,wherein said binarizing section outputs the binarized signals, one of which indicates logic ZERO for a portion corresponding to the background of an original in the frame, and another of which indicates logic ONE for a portion between frames; andwherein said determination section determines that there are frames in a portion where the logical product of the plural binarized signals becomes logic ZERO, and determines that there is no frame in a portion where the logical product becomes logic ONE.