OCR (Optical Character Recognition) and ICR (Intelligent Character Recognition) are the basis of automatic document reading, they allow to extract characters from an image containing text: an 'a', an '8', a '€'... In this context, artificial intelligence (AI) and Machine Learning and Deep Learning technologies allow to group these extracted characters and to form words. Finally, expert systems will make it possible to draw a meaning from all these words in their context as a human could do. Only the combination of the 3 approaches guarantees the maximum automation of your documents.