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The main point of this invention is the use of mis-registration in order to raise a scanner's nominal resolution.
English (United States)
This text was extracted from a PDF file.
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A method that utilizes the color components of an RGB scanner in order to raise its effective resolution.
Usually the three components of an RGB image are not registered with one another. This is an artifact, not a feature. This is an annoying phenomenon that users want to get rid of, and it is reflected by color fringes of objects. Usually, if this disturbs users, they fix it by computing the shifts between the colors and then through alignment/registration of the three color layers. This is a problem regarding color registration which has nothing to do with the scanner resolution. However, increasing resolution is always a goal for almost every application that uses scanners. Sometimes, one scans a black and white document that has no color information or that doesn't need that information. It has been observed that this annoying phenomenon could, in fact, be used for the best. That is to say that, for black and white documents, mis-registration could be used in order to raise the resolution of the scanner. As far as is known, this above-mentioned "bad" phenomenon has not to now been used as a lever to improve image resolution. So the main point of this invention is the use of mis-registration in order to raise a scanner's nominal resolution.
When one deals with black and white (gray level) information, the three components are fully correlated with one another, and, therefore, scanning with an RGB scanner is equivalent to scanning three times with a gray level...