Method of using a fiducial in determining two media types of different lengths used on a flatbed scanner

摘要

A method for determining a media size of a target scanned on the platen of the flatbed scanner using a fiducial placed on a backer of the flatbed scanner at a predetermined location. The fiducial is comprised of a plurality of objects, either placed in a predetermined pattern or randomly within a fiducial frame. A target is placed on the platen of the flatbed scanner and scanned along with the backer. The scanned image data of the target and backer is searched for the fiducial image. When the fiducial image is found, the media is selected to be of a first target type having a first length, and, when the fiducial is not found the target is selected to be of a second target type have a second length longer than the first length.

主权项

1. A method for determining a length of a target placed on a platen of a flatbed scanner having a scan bar translated beneath the platen and a scan lid with a backer mounted thereon, the platen having a scan area, the backer having a fiducial on an outer surface of the backer at a predetermined location that is within a scan area of the platen when the scan lid is in a closed position and is between a first location L1 and a second location L2 corresponding to a bottom edge of a first target type and a bottom edge of a second target type, respectively, where L2>L1, the method comprising:
placing a target in the scan area and placing the scan lid in the closed position; scanning the target and the backer with the scan bar to create a scanned image; searching the scanned image for an image of the fiducial; determining whether or not the image of the fiducial has been found; on determining that the image of the fiducial has been found, selecting the target to be of the first target type; and, on determining that the image of the fiducial has not been found, selecting the target to be of the second target type.