System and method for detecting a camera
First Claim
Patent Images
1. A system for detecting an optical device, comprising:
- an illumination system for illuminating a target area;
an image acquisition system comprising a camera for capturing a first short-exposure image of the target area from a first position and for capturing a second long-exposure image of the target area from the first position; and
a processor and computer readable media having computer code for causing the processor to identify retro-reflections in the target area by analyzing the first short-exposure image and the second long-exposure image,wherein the computer code for causing the processor to identify retro-reflections in the target area by analyzing the first short-exposure image and the second long-exposure image comprises;
identifying a local maximum having a well-defined peak of bright pixels surrounded by darker pixels in the first short-exposure image;
determining if the identified local maximum has a size that is less than a threshold size in the first short-exposure image; and
upon determining that the identified local maximum has a size that is less than a threshold size in the first short-exposure image, selecting the identified local maximum as a candidate local maximum in the first short-exposure image;
identifying a local maximum having a well-defined peak of bright pixels surrounded by darker pixels in the second long-exposure image;
determining a size of the identified local maximum in the second long-exposure image;
determining if the identified local maximum has a size that is less than a threshold size in the second long-exposure image; and
upon determining that the identified local maximum has a size that is less than a threshold size in the second long-exposure image, selecting the identified local maximum as a candidate local maximum in the second long-exposure image;
determining if the candidate local maximum in the first short-exposure image and the candidate local maximum in the second long-exposure image are reflections from the same optical device by comparing the first short-exposure image and the second long-exposure image; and
upon determining that the candidate local maximum in the first short-exposure image and the candidate local maximum in the second long-exposure image are reflections from the same optical device, indicating that the optical device has been detected.
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Abstract
A system and method for detecting a camera. In one embodiment, although not limited thereto, an illuminator illuminates an area of interest. A camera then takes multiple pictures of the illuminated area and an algorithm is then used to compare the pictures and locate and pirate cameras based on the reflection characteristics.
33 Citations
16 Claims
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1. A system for detecting an optical device, comprising:
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an illumination system for illuminating a target area; an image acquisition system comprising a camera for capturing a first short-exposure image of the target area from a first position and for capturing a second long-exposure image of the target area from the first position; and a processor and computer readable media having computer code for causing the processor to identify retro-reflections in the target area by analyzing the first short-exposure image and the second long-exposure image, wherein the computer code for causing the processor to identify retro-reflections in the target area by analyzing the first short-exposure image and the second long-exposure image comprises; identifying a local maximum having a well-defined peak of bright pixels surrounded by darker pixels in the first short-exposure image; determining if the identified local maximum has a size that is less than a threshold size in the first short-exposure image; and upon determining that the identified local maximum has a size that is less than a threshold size in the first short-exposure image, selecting the identified local maximum as a candidate local maximum in the first short-exposure image; identifying a local maximum having a well-defined peak of bright pixels surrounded by darker pixels in the second long-exposure image; determining a size of the identified local maximum in the second long-exposure image; determining if the identified local maximum has a size that is less than a threshold size in the second long-exposure image; and upon determining that the identified local maximum has a size that is less than a threshold size in the second long-exposure image, selecting the identified local maximum as a candidate local maximum in the second long-exposure image; determining if the candidate local maximum in the first short-exposure image and the candidate local maximum in the second long-exposure image are reflections from the same optical device by comparing the first short-exposure image and the second long-exposure image; and upon determining that the candidate local maximum in the first short-exposure image and the candidate local maximum in the second long-exposure image are reflections from the same optical device, indicating that the optical device has been detected. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12)
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13. A method of detecting an optical device, comprising the steps of:
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(a) acquiring a first short-exposure image of a target area from a first position by using a camera; (b) acquiring a second long-exposure image of the target area from the first position by using a camera; and (c) identifying retro-reflections in the target area by analyzing the first short-exposure image and the second long-exposure image by using a processor by; identifying a local maximum having a well-defined peak of bright pixels surrounded by darker pixels in the first short-exposure image; determining if the identified local maximum has a size that is less than a threshold size in the first short-exposure image; and upon determining that the identified local maximum has a size that is less than a threshold size in the first short-exposure image, selecting the identified local maximum as a candidate local maximum in the first short-exposure image; identifying a local maximum having a well-defined peak of bright pixels surrounded by darker pixels in the second long-exposure image; determining a size of the identified local maximum in the second long-exposure image; determining if the identified local maximum has a size that is less than a threshold size in the second long-exposure image; and upon determining that the identified local maximum has a size that is less than a threshold size in the second long-exposure image, selecting the identified local maximum as a candidate local maximum in the second long-exposure image; determining if the candidate local maximum in the first short-exposure image and the candidate local maximum in the second long-exposure image are reflections from the same optical device by comparing the first short-exposure image and the second long-exposure image; and upon determining that the candidate local maximum in the first short-exposure image and the candidate local maximum in the second long-exposure image are reflections from the same optical device, indicating that the optical device has been detected. - View Dependent Claims (14)
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15. A system for detecting an optical device, comprising:
- means for illuminating a target area with illumination;
means for capturing a first short-exposure image of the target area from a first position;
means for capturing a second long-exposure image of the target area from the first position;
a processor and computer readable media having computer code for causing a processor to identify retro-reflections in the target area by;identifying a local maximum having a well-defined peak of bright pixels surrounded by darker pixels in the first short-exposure image; determining if the identified local maximum has a size that is less than a threshold size in the first short-exposure image; and upon determining that the identified local maximum has a size that is less than a threshold size in the first short-exposure image, selecting the identified local maximum as a candidate local maximum in the first short-exposure image; identifying a local maximum having a well-defined peak of bright pixels surrounded by darker pixels in the second long-exposure image; determining a size of the identified local maximum in the second long-exposure image; determining if the identified local maximum has a size that is less than a threshold size in the second long-exposure image; and upon determining that the identified local maximum has a size that is less than a threshold size in the second long-exposure image, selecting the identified local maximum as a candidate local maximum in the second long-exposure image; determining if the candidate local maximum in the first short-exposure image and the candidate local maximum in the second long-exposure image are reflections from the same optical device by comparing the first short-exposure image and the second long-exposure image; and upon determining that the candidate local maximum in the first short-exposure image and the candidate local maximum in the second long-exposure image are reflections from the same optical device, indicating that the optical device has been detected. - View Dependent Claims (16)
- means for illuminating a target area with illumination;
Specification