| 摘要 |
PROBLEM TO BE SOLVED: To correctly calibrate in real time and in a short time by picking up images of two comparison objects by two images pick-up devices respectively, comparing obtained image signals and displaying a normal part and a different part in different colors. SOLUTION: Each of red, green and blue signals obtained by picking up an image by an image pickup device 3 arranged on a center face of a document 1, and each of red, green and blue signals obtained by picking up an image by an image pickup device 4 arranged on a center face of a comparison object 2 to be calibrated, are inputted to a digital signal-processing apparatus. The image signals are added at the digital signal-processing apparatus. A different part between the document 1 and the comparison object 2 is displayed on a screen as a color difference by a display apparatus. At this time, when the different part of contents between the document 1 and the comparison object 2 is not present, the whole screen turns violet. However, when there is a difference in the contents, only the different part is displayed in red. A normal part and the different part can be set in arbitrary colors by appropriately combining six image signals.
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