DEVICE FOR OPTICAL CHARACTER READING

摘要

A device for optical character reading comprising an optical reading unit, a video detector, a segmenting unit, a video buffer, a recognition unit and a controlling micro computer. The computer controls the setting of the threshold value in the video detector, and calculates by means of profile data received from the segmenting unit coordinates for a starting point for recognizing a character in the recognition unit. A comparator in the recognition unit compares bit by bit mask bits from a read only storage with corresponding data bits from the video buffer and stores the result into a status register. A recognized character is transferred from the read only storage to a character register, the computer is interrupted and a character is transferred from the recognition unit to the computer. The video detector comprises selectively connectable and computer controlled attenuation resistors for setting up a threshold signal curve simulating the form for the video signal curve.