1. A method for authenticating a feature of a document, the method comprising: capturing a first image of a region of a document while the region is subjected to a first wavelength of electromagnetic radiation, the region comprising at least a portion of the document; determining a first intensity value associated with the first image of the region; comparing the first intensity value with a first training intensity value of a region of a training document, the first training intensity value obtained using the first wavelength of electromagnetic radiation; and determining whether the document is authentic at least partially based on the comparison between the first intensity value and the first training intensity value.