Evaluating perforations on document images

A method comprising:

• obtaining, using one or more processors, at least one image of a document, wherein valid instances of the document include at least one perforation-based three-dimensional security feature;
• obtaining, using the one or more processors, a first image snippet from the document, the first image snippet corresponding to at least a first portion of the perforation-based three-dimensional security feature present in the valid instances of the document;
• analyzing, using the one or more processors, a set of one or more characteristics of the perforation-based three-dimensional security feature;
• and
• modifying, using one or more processors, a likelihood that the document is accepted as valid, or rejected as invalid, based on a presence, or an absence, of at least a first characteristic in the set of one or more characteristics.