| 摘要 |
<p>A decoding device has data extracting units extracting data from an image, data occurrence frequency calculating units calculating an occurrence frequency of data on a digit-by-digit basis, weighting units setting a weight corresponding to the occurrence frequency for every reference code so that the data with a smaller occurrence frequency is decided as a result of detection based on a decision by a weighted majority, or so that the decision of the detection result based on the decision by the weighted majority gets unable to be made due to equivalence in the decision by the weighted majority, first decision-by-majority units deciding the detection result of the data on the basis of the decision by the weighted majority, and judging units judging whether the image is falsified or non-falsified in accordance with whether the detection code decided by the first decision-by-majority units, is correct or erroneous.</p> |
