MULTI-COLOR DROPOUT FOR SCANNED DOCUMENT
First Claim
Patent Images
1. A method for removing at least one unwanted form color content from scanned image data for a document, the method comprising:
- a) obtaining the scanned document image data in a color data format;
b) segmenting the image data into two or more tiles;
c) classifying each tile into at least first and second sets according to its combination of background and color content;
d) identifying a background color from the first set of tiles;
e) identifying at least one form color from the second set of tiles; and
f) applying a transform that shifts form color image data values toward background color values.
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Abstract
A method for removing unwanted form color content from a scanned document by segmenting the image into two or more tiles (14). Each tile (14) is classified into at least a first and second set according to its combination of background and color content. A background color is identified from the first set of tiles (14). At least one form color is identified from the second set of tiles. A transform is applied that shifts form color image data values toward background color data values.
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Citations
25 Claims
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1. A method for removing at least one unwanted form color content from scanned image data for a document, the method comprising:
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a) obtaining the scanned document image data in a color data format; b) segmenting the image data into two or more tiles; c) classifying each tile into at least first and second sets according to its combination of background and color content; d) identifying a background color from the first set of tiles; e) identifying at least one form color from the second set of tiles; and f) applying a transform that shifts form color image data values toward background color values. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9)
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10. A method for removing unwanted form color content from scanned image data for a document, the method comprising:
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a) obtaining the scanned document image data in a color data format; b) segmenting the image data into two or more tiles; c) characterizing each tile by its color content with the steps of; (i) generating a red histogram for red color values within the tile; (ii) generating a green histogram for green color values within the tile; (iii) generating a blue histogram for blue color values within the tile; (iv) determining, according to the red, green, and blue histogram distributions, whether the tile contains predominantly neutral background content, or predominantly form color content, or a combination of background and color content; d) identifying a background color according to tiles having predominantly neutral background content; e) identifying at least one form color according to tiles having predominantly form color content; and f) selectively transforming pixels having the at least one form color toward the background color. - View Dependent Claims (11, 12, 13, 14, 15, 16, 17, 18, 19)
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20. A method for scanning documents comprising:
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a) scanning a first document containing a first form color and a first background color; b) detecting at least the first form color and the first background color from the scanned data for the first document; c) calculating and applying a first transform according to the detected first form color and first background color, wherein the first transform shifts the first form color toward the first background color; d) scanning a second document containing a second form color and a second background color, wherein the second form color differs from the first form color and the second background color differs from the first background color; e) detecting at least the second form color and the second background color from the scanned data for the second document; and f) calculating and applying a second transform according to the detected second form color and second background color, wherein the second transform shifts the second form color toward the second background color. - View Dependent Claims (21)
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22. A method for removing at least one unwanted form color from scanned document data comprising:
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a) forming a plurality of non-overlapping segments of the document data; b) generating a red, a green, and a blue histogram for each segment; c) detecting one or more peaks in any of the red, green, or blue histograms; d) detecting a background color according to the peaks; e) transforming peak values from the red, green, and blue histograms to hue, saturation, and value coordinate values; f) analyzing the hue, saturation, and value coordinate values; and g) detecting the at least one unwanted form color according to the hue, saturation, and value coordinate values.
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23. A method for scanning a plurality of documents, wherein providing document data for each document in the plurality of documents repeats the steps of:
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a) obtaining the scanned document image data in a color data format; b) calculating a background color and at least one form color according to the scanned document image data; and c) calculating and applying a transform according to the at least one form color and background color, wherein the transform shifts the form color toward the background color.
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24. A method for scanning documents comprising:
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a) scanning a document containing at least first and second form colors and a background color; b) detecting the first form color and the background color from the scanned document data; c) calculating and applying a first transform according to the detected first form color and background color, wherein the first transform shifts the first form color toward the background color; d) detecting the second form color from the scanned document data; and e) calculating and applying a second transform according to the detected second form color and background color, wherein the second transform shifts the second form color toward the background color. - View Dependent Claims (25)
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Specification