A patch code is a pattern of horizontal black bars separated by spaces. The following image is an example of a patch code:
Typically, the patch code is placed near the leading edge of a paper document so that documents may be separated into logical groups while scanning. Patch codes are currently available for Kofax and Dunord scanner interfaces. Kofax interfaces recognize all six types of patch codes. Dunord recognizes the three standard patch codes: Patch T, Patch 2 and Patch 3.