Laser speckle photography for surface tampering detection
First Claim
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1. A method comprising:
- comparing speckles in a reference image of an object captured with a camera at a first time in a particular location relative to the object and at a particular angle relative to the object, while coherent illumination is projected on the object, to speckles in a test image of the object captured with a camera at a second time positioned in the particular location relative to the object and at the particular angle relative to the object while the coherent illumination is projected on the object, the particular location being within a location threshold and the particular angle being within an angle threshold;
wherein the projector, first camera and second camera are removably provided to and positioned in a site of the object.
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Abstract
In one embodiment, a method comprises projecting, from a projector, a diffused on an object. The method further includes capturing, with a first camera in a particular location, a reference image of the object while the diffused is projected on the object. The method further includes capturing, with a second camera positioned in the particular location, a test image of the object while the diffused is projected on the object. The method further includes comparing speckles in the reference image to the test image. The projector, first camera and second camera are removably provided to and positioned in a site of the object.
46 Citations
24 Claims
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1. A method comprising:
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comparing speckles in a reference image of an object captured with a camera at a first time in a particular location relative to the object and at a particular angle relative to the object, while coherent illumination is projected on the object, to speckles in a test image of the object captured with a camera at a second time positioned in the particular location relative to the object and at the particular angle relative to the object while the coherent illumination is projected on the object, the particular location being within a location threshold and the particular angle being within an angle threshold; wherein the projector, first camera and second camera are removably provided to and positioned in a site of the object. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12)
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13. A system comprising:
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a processor; and a memory with computer code instructions stored thereon, the processor and the memory, with the computer code instructions being configured to implement; a correlation module configured comparing speckles in a reference image of an object captured with a first camera at a first time in a particular location relative to the object and at a particular angle relative to the object, while coherent illumination is projected on the object, to speckles in a test image of the object captured with a second camera positioned in the particular location relative to the object and at the particular angle relative to the object while the coherent illumination is projected on the object, the particular location being within a location threshold range and the particular angle being within an angle threshold range; wherein the projector, first camera and second camera are removably provided to and positioned in a site of the object. - View Dependent Claims (14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24)
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Specification