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Updated: Jun 23, 2026

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Published on: March 12, 2019
Nondestructive imaging of hidden figures on license plates by X-ray radiograph
Oc-Yeub Jeon1, Sang-Hyeon Kim, Joong Lee
1Physical Analysis Division, National Institute of Scientific Investigation, 331-1 Shin-Wol-7-Dong, Yang-Cheon-Gu, Seoul 158-707, Republic of Korea. yeubjeon@nisi.go.kr
Abstract:
In this case, we investigated the modified license plates. The evidences had new embossing pressed serial numbers after erasing the original numbers on the license plates by hammering. The X-ray radiograph could visualize the hidden figures; those were virtually unseen by naked eyes or undetectable by ordinary photography. To reveal the erased figures, we performed image processing with computer software after X-ray radiographs. It proved to be an efficient nondestructive way to visualize the hidden original figures on metals.
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