Enhancing the legibility of images using monochromatic light sources
AssigneeGeorgetown University
InventorsOphir Frieder, Gideon Frieder, Jon Parker
Life of this patent
Estimating the term…
Abstract
A system and method are described for enhancing readability of document images by operating on each document individually. Monochromatic light sources operating at different wavelengths of light can be used to obtain greyscale images. The greyscale images can then be used in any desired image enhancement algorithm. In one example algorithm, an automated method removes image background noise and improves sharpness of the scripts and characters using edge detection and local color contrast computation.
Claims21
A method of enhancing imaging of a document, comprising:
- capturing a first image of the document using monochromatic light at a first wavelength, wherein the first image includes content including one or more of the following:
- typed text or hand written text;
- capturing one or more additional images of the document using monochromatic light at one or more different wavelengths than the first wavelength;
- and
- combining the first image and the one or more additional images by subtraction to remove texture from document and to extract the content.
A computer-readable storage medium, which is non-transitory, including instructions that upon execution cause a computer system to:
- capture a first image of a document using a first monochromatic light source at a first wavelength, wherein the first wavelength is chosen for capturing content of the document;
- capture a second image of the document using a second monochromatic light source at a second wavelength, different than the first wavelength, wherein the second wavelength is chosen for capturing a texture or other features of the document;
- and
- combine at least the first and second images through a subtraction operation to remove the texture from the document.
Dependencies are inferred from the claim text.