Object detection for sudden illumination changes using order consistency
First Claim
1. A method for object detection with sudden illumination changes, the method comprising:
- providing a first image having a plurality of pixels;
receiving a second image corresponding to a time other than that of said first image;
calculating a difference map between said first and second images;
selecting a pair of pixel locations from at least one of said first and second images in accordance with said difference map;
statistically modeling a camera noise level for at least one of said first and second images;
computing the likelihood of order inconsistency between a pair of pixel values at said selected locations in said first image and a pair of pixel values at said selected locations in said second image in accordance with said camera noise level; and
detecting a changed object in accordance with said computed likelihood.
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Abstract
A system and method for object detection with sudden illumination changes provides a system including a camera model unit for computing a difference map between a first input image and a second input image, an illumination model unit in signal communication with the camera model unit for comparing the sign of the difference between two pixels in a first input image against the sign of the difference between two pixels in a second input image, and a CPU in signal communication with the camera model unit and the illumination model unit for detecting a changed object in accordance with said comparison when said sign of the difference is changed; and a corresponding method including providing a first image having a number of pixels, receiving a second image subsequent to the first image, calculating a difference map between the first and second images, selecting a pair of pixel locations from the first or second images in accordance with the difference map, statistically modeling a camera noise level for the first and second images, computing the likelihood of order inconsistency between a pair of pixel values at the selected locations in the first image and a pair of pixel values at the selected locations in the second image in accordance with the camera noise level; and detecting a changed object in accordance with the computed likelihood.
44 Citations
46 Claims
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1. A method for object detection with sudden illumination changes, the method comprising:
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providing a first image having a plurality of pixels;
receiving a second image corresponding to a time other than that of said first image;
calculating a difference map between said first and second images;
selecting a pair of pixel locations from at least one of said first and second images in accordance with said difference map;
statistically modeling a camera noise level for at least one of said first and second images;
computing the likelihood of order inconsistency between a pair of pixel values at said selected locations in said first image and a pair of pixel values at said selected locations in said second image in accordance with said camera noise level; and
detecting a changed object in accordance with said computed likelihood. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14)
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15. A system (100) for object detection with sudden illumination changes, the system comprising:
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a camera model unit (180) for computing a difference map between a first input image and a second input image;
an illumination model unit (170) in signal communication with the camera model unit for comparing the sign of the difference between two pixels in a first input image against the sign of the difference between two pixels in a second input image; and
a CPU (102) in signal communication with said camera model unit and said illumination model unit for detecting a changed object in accordance with said comparison when said sign of the difference is changed. - View Dependent Claims (16, 17, 18)
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19. A system for object detection with sudden illumination changes, the system comprising:
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providing means for providing a first image having a plurality of pixels;
receiving means for receiving a second image corresponding to a time other than that of said first image;
calculating means for calculating a difference map between said first and second images;
selecting means for selecting a pair of pixel locations from at least one of said first and second images in accordance with said difference map;
modeling means for statistically modeling a camera noise level for at least one of said first and second images;
computing means for computing the likelihood of order inconsistency between a pair of pixel values at said selected locations in said first image and a pair of pixel values at said selected locations in said second image in accordance with said camera noise level; and
detecting means for detecting a changed object in accordance with said computed likelihood. - View Dependent Claims (20, 21, 22, 23, 24, 25, 26, 27, 28, 29, 30, 31, 32)
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33. A program storage device readable by machine, tangibly embodying a program of instructions executable by the machine to perform method steps for object detection with sudden illumination changes, the method steps comprising:
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providing a first image having a plurality of pixels;
receiving a second image corresponding to a time other than that of said first image;
calculating a difference map between said first and second images;
selecting a pair of pixel locations from at least one of said first and second images in accordance with said difference map;
statistically modeling a camera noise level for at least one of said first and second images;
computing the likelihood of order inconsistency between a pair of pixel values at said selected locations in said first image and a pair of pixel values at said selected locations in said second image in accordance with said camera noise level; and
detecting a changed object in accordance with said computed likelihood. - View Dependent Claims (34, 35, 36, 37, 38, 39, 40, 41, 42, 43, 44, 45, 46)
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Specification