IMAGE PREPARATION
The starting point is the simple photo of a receipt. The latter can be produced in a range of different conditions and qualities: the light could be anything but optimal, the background present or absent, the quality of the paper can vary. All conditions that hinder automatic processing. For this reason, the images are subjected to an initial pre-processing phase, which allows them to be received as well as possible by the Optical Character Recognition System. Noise reduction, de-speckling (or image cleaning), binarisation, edge smoothing, rotation and lighting correction are some of the techniques used to facilitate the Intelligent Character Recognition (ICR) extraction and to improve the recognition accuracy.