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AssigneeKonica Minolta Laboratory U.S.A., Inc.
InventorsYibin Tian, Wei Ming
Estimating the term…
A method is described to obtain a binary image from the print-and-scan process to best match the known original. A point-spread function (PSF) of the PAS process is first obtained from its knife-edge responses, and deblurring is carried out on the scanned images using deconvolution. After image deskewing and preliminary registration, a supervised adaptive thresholding procedure is utilized to binarize the scanned image such that a measure of difference (e.g. the Euclidean distance) between the original and binarized images is minimized. The supervised adaptive thresholding procedure divides the scanned images into many rectangular sub-images. Otsu's method is used to find a starting threshold for each scanned sub-image. An optimal threshold is found around the Otsu's threshold via iterative search to minimize the measure of difference between the original sub-image and scanned sub-image. The sub-images are binarized using the optimal threshold. This method may be used in document authentication.
A method implemented in a data processing system for processing a hardcopy document, the hardcopy document having been printed by a printer based on a original image, the original image being a binary digital image, comprising:
A computer program product comprising a computer usable non-transitory medium having a computer readable program code embedded therein for controlling a data processing apparatus, the computer readable program code configured to cause the data processing apparatus to execute a process for processing a hardcopy document, the hardcopy document having been printed by a printer based on a digital original image, the original image being a binary image, the process comprising:
Dependencies are inferred from the claim text.