FindBlackSquares Method of the ImageDocument Object
FindBlackSquares method of the ImageDocument Object in the ABBYY FineReader Engine API — Finds black squares on the image (commonly used as anchors on fill-in forms) and returns their locations.
Result[out, retval] A pointer to an IRegionsCollection* pointer variable that receives the interface pointer of the RegionsCollection object containing regions that represent the locations of found black squares.