Methods and apparatus to count persons in a monitored environment
First Claim
1. An apparatus to count a number of persons in a monitored environment, comprising:
- an image sensor to collect a plurality of pixels;
a pseudorandom number generator configured to generate sets of pseudorandom coordinates;
a reader to read first pixel data generated by first pixels of the image sensor at corresponding first times, the first pixels corresponding to respective sets of the pseudorandom coordinates;
a comparator to compare the first pixel data with second pixel data generated by the first pixels at respective second times different from the first times to generate first change values; and
a counter to generate a count of persons based on the first change values.
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Abstract
Methods and apparatus to count persons in a monitored environment are disclosed. An example apparatus to count the number of people in a monitored environment is described, which includes an image sensor having a plurality of pixels, a pseudorandom number generator to generate pseudorandom coordinates, a reader to read first pixel data generated by a first pixel of the image sensor at a first time, the first pixel corresponding to the pseudorandom coordinates, a comparator to compare the first pixel data with second pixel data generated by the first pixel at a second time different from the first time to generate a change value, and a counter configured to generate a count of persons based at least on the change value.
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Citations
25 Claims
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1. An apparatus to count a number of persons in a monitored environment, comprising:
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an image sensor to collect a plurality of pixels; a pseudorandom number generator configured to generate sets of pseudorandom coordinates; a reader to read first pixel data generated by first pixels of the image sensor at corresponding first times, the first pixels corresponding to respective sets of the pseudorandom coordinates; a comparator to compare the first pixel data with second pixel data generated by the first pixels at respective second times different from the first times to generate first change values; and a counter to generate a count of persons based on the first change values. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12)
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13. A method to count a number of persons in a monitored environment, comprising:
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pseudorandomly selecting first pixels from a plurality of pixels in an image sensor at corresponding first times; collecting first information sensed by the first pixels at the first times; comparing the first information to second information sensed by the first pixels at corresponding second times different from the first times to generate first change values; and determining whether the change values are indicative of a person being present in the monitored environment. - View Dependent Claims (14, 15, 16, 17, 18, 19)
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20. A tangible storage medium comprising instructions, which, upon execution, cause a machine to at least:
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pseudorandomly select first pixels from a plurality of pixels in an image sensor at corresponding first times; collect first information sensed by the first pixels at the first times; compare the first information to second information sensed by the first pixels at corresponding second times different from the first times to generate first change values; and determine whether the change values are indicative of a person being present in a monitored environment. - View Dependent Claims (21, 22, 23, 24, 25)
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Specification