An OCR session applies to both the training and reading procedures. An OCR session prepares the software to identify a set of characters during either the training procedure or the reading procedure. A session consists of the properties you set and the character set that you train or read from a file. OCR uses session information to compare objects with trained characters to determine if they match. If you want to process an image containing characters that you stored in multiple character sets, use multiple OCR sessions simultaneously to read all the characters simultaneously.

You also can merge several character sets in one session. If you choose to merge multiple character sets, train each of the character sets with the same segmentation parameters.