Bill examination device
AssigneeOki Electric Industry Co., Ltd.
InventorsIenobu Takizawa, Takashi Yajima, Mitsunori Shigeta
Life of this patent
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Abstract
In a bill examination device in which a signal pattern obtained by scanning the bill with a photo-detector or a magnetic detector is compared with a reference for testing the authenticity, the signal is subjected to differentiation or removal of a direct-current component before the comparison. The effect of the differences or offsets of the detector or its associated circuit due to manufacturing variations, temperature change, or aging, and differences in the darkness of printing or smudge on the bill is reduced, and the reliability of the authenticity test is improved.
Claims27
A bill examination device comprising:
- a detecting means for detecting a physical pattern of a bill;
- a differentiating means for differentiating the physical pattern to produce a differential pattern;
- an allowable range pattern generating means for outputting an allowable range pattern;
- a comparing means for comparing the differential pattern with the allowable range pattern, and outputting the result of comparison;
- and
- a judgement means responsive to the result of comparison from the comparing means for making judgement on the authenticity of the bill;
- wherein said detecting means comprises a plurality of detecting elements positioned at different lateral positions with respect to the direction in which the bill is moved relative to the detecting means, and said detecting means detects a plurality of physical patterns at different lateral positions along a plurality of scan lines.
A bill examination device, comprising:
- a detecting means for detecting a physical pattern of a bill;
- a reference pattern generating means for outputting a reference pattern;
- a subtracting means for determining the difference between the physical pattern and said reference pattern to produce a difference pattern;
- a filter means for removing the direct-current component from the difference pattern to produce a filtered difference pattern;
- and
- an evaluating means for evaluating the filtered difference pattern to test the authenticity of the bill.
Dependencies are inferred from the claim text.