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US 2003/0142866 A1Published application
Dynamic bilevel thresholding of digital images
AssigneeHewlett-Packard Development Company, L.P.
InventorOscar A. Zuniga
Life of this patent
Estimating the term…
Abstract
In a digital image, for each pixel to be thresholded, a threshold is selected from a set of thresholds.
Claims11
A method of segmenting an image, comprising:
- selecting, for each pixel to be thresholded in the image, one threshold among a plurality of thresholds, based on the relative magnitudes of the thresholds;
- and
- assigning each pixel to one of two classes according to the value of its intensity relative to the selected threshold for the pixel.
A method of determining a threshold, comprising:
- computing, for each pixel of an image to be thresholded, at least one threshold that is dynamic;
- computing, for at least a region of the image, a threshold that is constant;
- and
- selecting, for each pixel of the image to be thresholded, one of the dynamic and constant thresholds.
1 more element
A method of identifying characters in an image, comprising:
- computing, for each pixel, at least one variable threshold;
- computing, for at least a region of the image, a constant threshold;
- selecting, for each pixel, the threshold corresponding to the highest intensity among the at least one variable threshold and the constant threshold;
- comparing, an intensity for each pixel, to the selected threshold;
- and
- assigning a pixel to a character class when an intensity for the pixel is less than the selected threshold for the pixel.
3 more elements
A system for segmenting an image, comprising:
- means, for each pixel of the image, for determining a plurality of thresholds;
- means, for each pixel of the image, for selecting one threshold among the plurality of thresholds;
- and
- means for assigning a pixel to one of two classes depending on whether an intensity of the pixel is greater than the selected threshold for the pixel.
1 more element
An image processing system, comprising:
- a processor having an input for receiving a digital image;
- a memory medium, readable by the processor, containing a program to instruct the processor to perform the following method:
- selecting, one threshold among a plurality of thresholds, based on the relative magnitudes of the thresholds;
- and,
- assigning each pixel in the digital image to one of two classes according to the value of its intensity relative to the selected threshold for the pixel.
2 more elements
A computer readable medium, containing a program to perform the following steps:
- selecting, for each pixel in a digital image, one threshold among a plurality of thresholds, based on the relative magnitudes of the thresholds;
- and,
- assigning each pixel in the digital image to one of two classes according to the value of its intensity relative to the selected threshold for the pixel.
Dependencies are inferred from the claim text.