Methods and Systems for Background Color Extrapolation
First Claim
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1. A method for determining a background color at a pixel of interest in a digital image, said method comprising:
- a. determining a pixel of interest in a digital image, wherein said pixel of interest is part of a first scan line with an associated first scan direction in said digital image;
b. receiving a color value for said pixel of interest;
c. receiving a control signal associated with said pixel of interest;
d. receiving a first background color estimate, wherein said first background color estimate is associated with said first scan line;
e. receiving a previous background color estimate, wherein said previous background color estimate is associated with a previous scan line in said digital image;
f. calculating a first color difference between said color value for said pixel of interest and said first background color estimate;
g. calculating a second color difference between said color value for said pixel of interest and said previous background color estimate; and
h. determining a first-scan background color estimate for said pixel of interest based on said control signal, said first color difference and said second color difference.
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Abstract
Aspects of the present invention are related to methods and systems for determining a background color in a digital image.
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Citations
24 Claims
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1. A method for determining a background color at a pixel of interest in a digital image, said method comprising:
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a. determining a pixel of interest in a digital image, wherein said pixel of interest is part of a first scan line with an associated first scan direction in said digital image; b. receiving a color value for said pixel of interest; c. receiving a control signal associated with said pixel of interest; d. receiving a first background color estimate, wherein said first background color estimate is associated with said first scan line; e. receiving a previous background color estimate, wherein said previous background color estimate is associated with a previous scan line in said digital image; f. calculating a first color difference between said color value for said pixel of interest and said first background color estimate; g. calculating a second color difference between said color value for said pixel of interest and said previous background color estimate; and h. determining a first-scan background color estimate for said pixel of interest based on said control signal, said first color difference and said second color difference. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14)
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15. A system for determining a background color at a pixel of interest in a digital image, said system comprising:
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a. a pixel-of-interest selector for selecting a pixel of interest in a digital image, wherein said pixel of interest is part of a first scan line with an associated first scan direction in said digital image; b. a background-label receiver for receiving a background label for said pixel of interest; c. an edge-label receiver for receiving an edge label for said pixel of interest; d. a pictorial-label receiver for receiving a pictorial label for said pixel of interest; e. a color-value receiver for receiving a color value for said pixel of interest; f. a first-background-color-estimate receiver for receiving a first background color estimate associated with said first scan line; g. a previous-background-color-estimate receiver for receiving a previous background color estimate associated with a previous scan line in said digital image; h. a first color-difference calculator for calculating a first color difference between said color value for said pixel of interest and said first background color estimate; i. a second color-difference calculator for calculating a second color difference between said color value for said pixel of interest and said previous background color estimate; and j. a first-scan background-color determiner for determining a first-scan background color estimate for said pixel of interest based on said background label, said edge label, said pictorial label, said first color difference and said second color difference. - View Dependent Claims (16, 17, 18, 19, 20, 21, 22, 23, 24)
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Specification