| 摘要 |
PURPOSE:To remove misrecognition by obtaining plural images relating to inclined lighting from respectively different directions as original images and adding these images. CONSTITUTION:Images D1-D4 obtained by photographing inclined light beams radiated from respective lighting lamps 3A-3D by a TV camera are switched by a switching circuit 21 and stored in an image memory 22. Since the shadows of the print grooves of these images D1-D4 are different each other in accordance with the lighting directions, respectively different low luminance part images are formed in spite of the same printed character. These different images D1, D3 and D2, D4 are added by an adder 22 to obtain a composed image D5. The composed image D5 is binarized by a threshold SH0 to obtain a binarization image signal D.
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