Patent 7359819 was granted and assigned to Microsoft on April, 2008 by the United States Patent and Trademark Office.
The testing of driver output is automated. Embodiments of the invention filter out data that is known to change between two similar outputs of a driver. By filtering this dynamic data out, the remaining data can be compared to known-good data to identify any variations which would appear in a physical manifestation (e.g., a printout) of the data.