Detecting objects in images using color histograms
First Claim
1. A method to detect an object in an image, the method comprising:
- segmenting the image into sets of subregions, different sets having at least one of different subregion sizes or different subregion offsets relative to one another;
determining a first comparison metric quantifying comparison of a first subregion with the object based on differences between bin values of a second color histogram corresponding to the object and adjusted bin values of a first color histogram corresponding to the first subregion;
determining a second comparison metric quantifying comparison of a second subregion with the object; and
comparing the first and second comparison metrics with a threshold to identify at least one of the subregions as being associated with a possible location of the object in the image.
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Abstract
Methods, apparatus and articles of manufacture for detecting objects in images using color histograms are disclosed. An example method disclosed herein comprises segmenting an image into sets of subregions, different sets having at least one of different subregion sizes or different subregion offsets relative to one another, determining a first comparison metric quantifying comparison of a first subregion with the object based on differences between bin values of a second color histogram corresponding to the object and adjusted bin values of a first color histogram corresponding to the first subregion, determining a second comparison metric quantifying comparison of a second subregion with the object, and comparing the first and second comparison metrics with a threshold to identify at least one of the subregions as being associated with a possible location of the object in the image.
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Citations
20 Claims
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1. A method to detect an object in an image, the method comprising:
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segmenting the image into sets of subregions, different sets having at least one of different subregion sizes or different subregion offsets relative to one another; determining a first comparison metric quantifying comparison of a first subregion with the object based on differences between bin values of a second color histogram corresponding to the object and adjusted bin values of a first color histogram corresponding to the first subregion; determining a second comparison metric quantifying comparison of a second subregion with the object; and comparing the first and second comparison metrics with a threshold to identify at least one of the subregions as being associated with a possible location of the object in the image. - View Dependent Claims (2, 3, 4, 5, 6, 7)
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8. A tangible machine readable medium storing machine readable instructions which, when executed, cause a machine to at least:
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segment an image into sets of subregions, different sets having at least one of different subregion sizes or different subregion offsets relative to one another; determine a first comparison metric quantifying comparison of a first subregion with the object based on differences between bin values of a second color histogram corresponding to the object and adjusted bin values of a first color histogram corresponding to the first subregion; determine a second comparison metric quantifying comparison of a second subregion with the object; and compare the first and second comparison metrics with a threshold to identify at least one of the subregions as being associated with a possible location of the object in the image. - View Dependent Claims (9, 10, 11, 12, 13, 14)
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15. An apparatus to detect an object in an image, the apparatus comprising:
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a histogram generator to generate respective test color histograms for subregions in sets of subregions of the image, different sets having at least one of different subregion sizes or different subregion offsets relative to one another; and a histogram comparator to; determine comparison metrics quantifying comparison of respective ones of the subregions with the object, a first comparison metric quantifying comparison of a first subregion with the object being based on differences between bin values of a reference color histogram corresponding to the object and respective adjusted bin values of a respective one of the test color histograms corresponding to the first subregion; and compare the comparison metrics with a threshold to identify at least one of the subregions as being associated with a possible location of the object in the image. - View Dependent Claims (16, 17, 18, 19, 20)
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Specification