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Detection of hidden marks on Hwatu cards used in illegal gambling
Hwatu is a popular card game widely played in both Korea and Japan. This study examined hwatu cards used in the fraudulent gambling in Korea. Fraudsters used the hwatu cards, with hidden marks printed on the back using special ink to identify the cards so that they could deceive ...
Structural and optical characterization of banknotes using spectral‐domain optical...
Counterfeiting of banknotes remains a severe threat to economic security and social stability. The characterization of banknote has mainly relied on the assessment of various security features applied to the surface of the note. However, the surface features are easy to forge and...
Comparative analysis of aged documents by desorption electrospray ionization–Mass...
Document dating is an important and challenging task in the field of forensic science. With the development of analytical techniques, related methods are emerging for document dating studies. Desorption electrospray ionization–mass spectrometry (DESI‐MS) is an ambient ionization‐...
Scanner model classification with characteristic brightness variations
Analog documents and scanned digitized files are now considered equivalent in legal contexts, and the widespread supply of multi‐functional printers has led to a surge in the use of scanned documents. With image editing tools, there has been more cases of forgery involving scanne...