Removing leakage from a double-sided document
AssigneeSeiko Epson Corporation
InventorsChenyu Wu, Jing Xiao
Life of this patent
Estimating the term…
Abstract
Aspects of the present invention include systems and methods for mitigating the effects of leakage when duplicating an image from a double-sided document. In embodiments, a device is calibrated by computing a leakage function. The leakage function is used to obtain a leakage mitigation function. Given the leakage function and the leakage mitigation function, an estimate of a true version of the document image can be obtained using as inputs only the images of the front-side and back-side of the double-sided document.
Claims20
A computer program product comprising at least one non-transitory computer-readable medium storing one or more sequences of instructions, wherein execution of the one or more sequences of instructions by one or more processors causes the one or more processors to reduce leakage of a double-sided document by causing the following steps comprising:
- obtaining a first image X captured by a sensor array, the first image X being an image of a first side A of a double-sided document;
- obtaining a second image Y captured by a sensor array, the second image Y being an image of a second side B of the double-sided document;
- using a leakage function to estimate leakage of the second side B onto the first side A, said leakage function being based on an empirical intensity mapping of known pixel intensity values printed on a first side of a document to their correspondingly observed leakage intensity values on the opposite side of the document;
- and
- applying a leakage mitigation function to the first image X minus the estimated leakage of the second side B onto the first side A to obtain an estimate image of the first side A.
A computer-implemented method for obtaining a leakage mitigation function that can be used to obtain an estimate of a image from a document, the method comprising:
- obtaining a first image captured by a sensor array, the first image being an image of a first side of a document having a calibration pattern having a known configuration comprising a plurality of areas of different intensities on a second side of the document;
- generating a set of data from the first image comprising intensities for each area of at least some of the areas in the first image that correspond to areas of the plurality of areas of the calibration pattern;
- estimating a leakage function by fitting a function to the set of data correlated to the corresponding intensities of the plurality of areas of the calibration pattern;
- and
- using the leakage function to obtain a leakage mitigation function that takes as inputs a first image of a first side of a double-sided document and a second image of a second side of the double-sided document and outputs a leakage-reduced image of the first side.
A system for mitigating leakage of a document, the system comprising:
- one or more interfaces for receiving a first image X captured by a sensor array, the first image X being an image of a first side A of a double-sided document and for receiving a second image Y captured by a sensor array, the second image Y being an image of a second side B of the double-sided document;
- a data storage for storing the first and second images;
- and
- one or more processors and at least one computer-readable medium storing one or more sequences of instructions, wherein execution of the one or more sequences of instructions by one or more processors causes the one or more processors to reduce leakage of a double-sided document by causing the following steps:
- using a leakage function to define a leakage image that estimates leakage of the second side B onto the first side A, said leakage function being based on an empirical intensity mapping of known pixel intensity values print on a first side of a document to their correspondingly observed leakage intensity values on the opposite side of the document;
- and
- applying a leakage mitigation function to the result of the first image X minus the leakage image to obtain an estimate image of the first side A.
Dependencies are inferred from the claim text.