JPS5629775A - Hand scanner reader - Google Patents

Abstract

PURPOSE: To read the input picture pattern in a correct way, by detecting the shift of position of the input picture pattern in the scanning direction of the 1-dimensional sensor and generated through the manual scanning and then shifting the reading region in correspondence to the shift of position detected.

CONSTITUTION: The signal supplied from the video signal line 9 is binary coded through the amplifier and the quantizing circuit 201. And the timing of the rise and fall is detected for the character signal through the upper and lower limit value detecting circuit 203 for the edge of the character signal. Based on this detected timing, the fixed modulated clock pulse 206' is produced by the clock pulse switching circuit 206. And the pulses between the rise and the fall are counted by the counter 207. Then the center position data is stored in the character center position data memory part 209. The output of the counter 208 which counts the driving pulses supplied from the sensor plus the output of the memory part 209 are applied to the compensating shift pulse and the shifting direction deciding circuit 212 to give the decision to the extent of compensation given to the shift as well as to the compensating direction. And the compensated reading region limit signal 217 is supplied to the gate circuit 218 from the reading gate pulse compensating circuit 261.

COPYRIGHT: (C)1981,JPO&Japio