There may be provided a processor-implemented method of causing annotation data to be overlaid on a viewport. The method may include: receiving a signal comprising image data, the image data representing a first document; performing optical character recognition on the image data to identify text in the first document; automatically analyzing the text based on stored classification data to identify a first parameter associated with the first document; comparing the first parameter to a second parameter, the second parameter being obtained from a data store and being associated with a second document; determining annotation data based on the comparison, the annotation data determined based on the first parameter and the second parameter; and providing a signal that includes an instruction to cause the annotation data to be overlaid on a viewport displaying a real-time image of the first document.