"One out of every three fish is mislabelled according to Oceana. Identifying fish in fillet form can be incredibly difficult to the naked eye. Oceana organizes an annual dinner with reknown sushi chefs each year. Despite their experience, they are consistently fooled. Instead of regular vision, we use infrared spectroscopy. This is a common scientifc technique that has been successfully applied to fish fillet authentication in this study. [...]
We have built upon the audio fingerprint algorithm which is the basis of Shazam. In fact, Shazam uses spectograms as well. It is just not recorded via infrared. Therefore, the algorithms are similar. We have extended the DejaVu open source project which uses audio fingerprinting algorithms with the python language and numpy library."