Hyperspectral image processing and display techniques in the context of forensic document investigation

Nowadays, deployment of forensic document investigation systems that employ hyperspectral image processing is being widespread. The reason such systems are being preferred is mainly due to their non-destructive nature of document investigation, fast processing time, and the ability to reveal erased and covered writings, and details. On the other hand, analyzing hyperspectrum, obtained after a document scan, is a nontrivial task, which requires special training. Even trained document investigators may spend a plenty of effort to reveal covert evidence. In this work, we discuss hyperspectral image processing and display techniques we have developed to ease the job of forensic document investigators. Besides, our techniques will help to the investigators performing more constructive guesses during their investigation process. Additionally, this work aims to provide general knowledge about the hyperspectral image processing based document investigation to the interesting reader.