Patent ID: 8417016

Claim:
An acceptor device for sheet objects, comprising: a sensor to derive data corresponding to a spatial array of sample data from a face of a sheet object, said sample data being configured in a sampling frame that lies within a range of positional relationships to a reference frame; a processor configured to process the data to: identify an approximate mid location within the perimeter of the sheet object, define scanning lines extending outwardly from said approximate mid location and traversing locations corresponding to edges of the sheet object, scan data samples along the scanning lines to identify locations corresponding to edges of the sheet object, and determine the relationship between the reference frame and the sampling frame for the sensed data based on the identified locations of the sheet object, the processor being operable to transform pre-selected regions of the sensed data from the sampling frame so as to correspond to data in the reference frame, and to make a comparison of the transformed data with reference data corresponding to the pre-selected regions in the reference frame that define acceptability criteria for sheet objects in said reference frame; and an acceptor responsive to the processor and operable to accept or reject the sheet object depending on the outcome of the comparison.