| 摘要 |
PURPOSE:To reduce the load of an operator and to improve reading information by directly displaying whether an object to be read out is accurately included within a visual field of an image sensor or not and which direction is to be selected to move and position a scanner when the object is deviated from the visual field. CONSTITUTION:Positional information based on histograms 8x, 8y is inputted to a direction deciding part 9 mounted on an external device 6. The deciding part 9 decides whether an image is completely included within the visual field or not based on the positional information, and when the image is deviated from the visual field, decides the direction to move the scanner 1 and outputs the decided results to a display part 10 in the scanner 1. If the scanner 1 is shifted downward, an upper light emitting plate 11a is emitted to instruct the upward movement of the scanner 1. When the scanner is shifted to the upper, left or right direction, corresponding light emitting plates 11b-11d are similarly emitted to instruct the movement in respective directions. When the image is stored in the visual field, the light is turned off.
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