JPS556635A - Character reader - Google Patents

Abstract

PURPOSE: To make the fetch range of character patterns appropriate easily by obtaining the vertical center value of a format discrimination character by sequentially shifting a projection pattern obtained from a quantized pattern, and also by controlling the fetch range of the quantized character pattern.

CONSTITUTION: A video signal obtained by scanning is quantized at a fixed slice level by quantization circuit 51, the output of which is sequentially shifted by clock (1) in shift register 52 to obtain a quantized pattern, and this pattern is supplied to OR gate 63 in group 1, so that projecting shift register 53 will obtain the projection pattern of the format discrimination character. This pattern is sequentially shifted out by clock (2) and vertical center value (a+b/2) of the format discrimination character is sent to shift clock generating circuit 59. The output of circuit 51, on the other hand, is sent to shift control signal generating circuit 62 by way of detection circuit 60 and character-number counter 61, thereby controlling the fetch range of character patterns quantized. Consequently, the fetch range of character patterns can easily be made suitable.

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