This method tries to determine the type of the text in the zones of a page (e.g. machine printed or dot-matrix printed text). The method performs a zone by zone analysis (instead of suggesting a general filling type for the entire image), and if the algorithm can determine a type for a given zone, the method replaces the DEFAULT value in the zone's ImGearRecZone.FillingMethod property by the determined one.

Reference

ImGearRecZoneCollection Class
ImGearRecZoneCollection Members