Methods and apparatus to count people appearing in an image
First Claim
Patent Images
1. An apparatus to count people in an image comprising:
- a motion detector to compare at least two images to detect motion occurring between the at least two images to develop a difference image;
a shape outliner to draw at least one shape based on the difference image; and
a blob discriminator to determine if the at least one shape represents a person;
wherein the blob discriminator comprises;
a center locator to identify a center of the at least one shape;
a center comparator to add a symbol representative of the center of the at least one shape to a histogram; and
a threshold counter to count symbols in the histogram exceeding a predetermined threshold as persons.
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Abstract
Methods and apparatus to count people appearing in an image are disclosed. One disclosed method reduces objects appearing in a series of images to one or more blobs; for each individual image in a set of the images of the series of images, represents the one or more blobs in the individual image by one or more symbols in a histogram; and analyzes the symbols appearing in the histogram to count the people in the image.
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Citations
32 Claims
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1. An apparatus to count people in an image comprising:
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a motion detector to compare at least two images to detect motion occurring between the at least two images to develop a difference image;
a shape outliner to draw at least one shape based on the difference image; and
a blob discriminator to determine if the at least one shape represents a person;
wherein the blob discriminator comprises;
a center locator to identify a center of the at least one shape;
a center comparator to add a symbol representative of the center of the at least one shape to a histogram; and
a threshold counter to count symbols in the histogram exceeding a predetermined threshold as persons. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10)
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11. A method of determining a number of people within at least one image comprising:
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(a) determining at least one difference image between at least two images;
(b) developing at least one shape from the at least one difference image;
(c) identifying a geometric parameter of the at least one shape;
(d) adding a symbol having a predetermined size and indicative of the geometric parameter of the at least one shape to a histogram;
(e) repeating (a)-(d); and
(f) if any symbol in the histogram grows beyond a predetermined threshold, counting the symbol as a person. - View Dependent Claims (12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22)
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23. A method of counting people appearing in a digital image comprising:
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reducing objects appearing in a series of images to one or more blobs;
for each individual image in a set of the images of the series of images, representing the one or more blobs in the individual image by one or more symbols in a histogram; and
analyzing the symbols appearing in the histogram to count the people in the image. - View Dependent Claims (24, 25, 26, 27, 28, 29)
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30. A method as defined in claim 30 wherein the series of amalgamated images are derived from a series of difference images, the series of difference images being derived from a sequence of original images including the digital image.
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31. A machine readable medium storing machine readable instructions which, when executed, cause a machine to:
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(a) determine at least one difference image between at least two images;
(b) develop at least one shape from the at least one difference image;
(c) identify a geometric parameter of the at least one shape;
(d) add a symbol having a predetermined size and indicative of the geometric parameter of the at least one shape to a histogram;
(e) repeat (a)-(d); and
(f) if any symbol in the histogram grows beyond a predetermined threshold, count the symbol as a person.
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32. An apparatus to count people appearing in a digital image comprising:
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a processor;
a memory storing computer readable instructions which, when executed, cause the processor to;
reduce objects appearing in a series of images to one or more blobs;
for each individual image in a set of the images of the series of images, represent the one or more blobs in the individual image by one or more symbols in a histogram; and
analyze the symbols appearing in the histogram to count the people in the image.
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Specification