Methods and systems for identifying regions of substantially uniform color in a digital image
First Claim
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1. A method for identifying a region of substantially uniform color in a digital image, said method comprising:
- in a computing system, determining a first plurality of select pixels surrounding an image-content edge in a digital image, wherein said determining a first plurality of select pixels comprises filtering said digital image, based on image classification information, to determine a plurality of text pixels located in a non-pictorial region of said digital image and, wherein said image classification information is a pictorial measure and an identification of a text candidate and said filtering comprises removing a text candidate when said text candidate is in a pictorial region of said digital image, wherein said text candidate comprises a pixel that is a portion of text;
for said first plurality of select pixels, determining, in said computing system, a frequency-of-occurrence of a plurality of color values;
in said computing system, identifying at least one color value associated with a peak frequency-of-occurrence; and
in said computing system, associating said at least one color value with an image label, thereby producing an association between said at least one color value and said image label.
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Abstract
Embodiments of the present invention comprise methods and systems for identifying uniformly colored regions in a digital image.
147 Citations
22 Claims
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1. A method for identifying a region of substantially uniform color in a digital image, said method comprising:
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in a computing system, determining a first plurality of select pixels surrounding an image-content edge in a digital image, wherein said determining a first plurality of select pixels comprises filtering said digital image, based on image classification information, to determine a plurality of text pixels located in a non-pictorial region of said digital image and, wherein said image classification information is a pictorial measure and an identification of a text candidate and said filtering comprises removing a text candidate when said text candidate is in a pictorial region of said digital image, wherein said text candidate comprises a pixel that is a portion of text; for said first plurality of select pixels, determining, in said computing system, a frequency-of-occurrence of a plurality of color values; in said computing system, identifying at least one color value associated with a peak frequency-of-occurrence; and in said computing system, associating said at least one color value with an image label, thereby producing an association between said at least one color value and said image label. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11)
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12. A system for identifying a region of substantially uniform color in a digital image, said system comprising:
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a pixel selector for selecting a first plurality of pixels in a digital image, wherein said first plurality of pixels surround an image-content edge in said digital image; a filter for combining a pictorial measure and a plurality of text candidates to determine a plurality of text pixels located in a non-pictorial region of said digital image and, wherein said filter removes a first text candidate from said plurality of text candidates when said first text candidate appears in a pictorial region of said digital image, wherein said first text candidate comprises a pixel that is a portion of text; a counter for counting a frequency-of-occurrence of a plurality of color values in said first plurality of pixels; an identifier for identifying at least one color value associated with a peak frequency-of-occurrence; and an associator for associating said at least one color value with an image label, thereby producing an association between said at least one color value and said image label. - View Dependent Claims (13, 14, 15, 16, 17, 18, 19, 20)
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21. A method for identifying a region of substantially uniform color in a digital image, said method comprising:
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in a computing system, detecting a text pixel in a non-pictorial region in a digital image comprising pixels, wherein said detecting a text pixel comprises filtering said digital image based on image classification information, wherein said image classification information is a pictorial measure and an identification of a text candidate and said filtering comprises removing a text candidate when said text candidate is in a pictorial region of said digital image, wherein said text candidate comprises a pixel that is a portion of text; in said computing system, generating a selection mask comprising selection-mask pixels, wherein said selection-mask pixels comprise a first pixel in a region substantially local to said text pixel, and wherein said selection-mask pixels do not include said text pixel; in said computing system, generating a histogram of a plurality of color values, wherein said determining comprises counting said selection-mask pixels; in said computing system, smoothing said histogram; in said computing system, identifying at least one color value associated with a peak in said histogram; in said computing system, associating said at least one color value with an image label, thereby producing an association between said at least one color value and said image label; and in said computing system, generating a look-up-table wherein said look-up-table comprises said association between said at least one color value and said image label. - View Dependent Claims (22)
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Specification