Three-dimensional Measurement Approach for Automatic Seal Impression Identification

A new approach is proposed in order to construct a practical automatic identification system for seal impressions. The 3D (three dimensional) measurement method is investigated to select a suitable measurement system for seal registration. The seals are measured as 3D image by employing the range finder system. The pre-processing is performed to correct the slight slant on the measured seal surface. Special attention is paid to deal with the variety in impression quality using the measured 3D image. Impressions affixed under various conditions are reconstructed by transforming the measured image to impressions. The effect of the proposed method is verified by experiments.

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