CAMERA TAMPERING DETECTION
First Claim
1. A method for identifying possible tampering of a camera view, said method comprising:
- receiving an image for analysis from an image sequence,converting the received image into an edge image,generating a similarity value indicating a level of similarity between said edge image and a reference edge image,indicating possible tampering of the camera view if the similarity value is within a specified tampering range,updating the reference edge image by combining a recently analyzed edge image with the reference edge image in case of each one of a predetermined number of consecutively analyzed images does not result in an indication of possible tampering,counting the number of consecutively analyzed images resulting in an indication of possible tampering, andgenerating an alarm signal in case of each one of a predetermined number of consecutively analyzed images does result in an indication of possible tampering, wherein said predetermined number is larger than one.
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Abstract
A method and a module for identifying possible tampering of a camera view. The method comprising receiving an image for analysis from an image sequence, converting the received image into an edge image, generating a similarity value indicating a level of similarity between said edge image and a reference edge image, indicating possible tampering of the camera view if the similarity value is within a specified tampering range, and updating the reference edge image by combining a recently analyzed edge image with the reference edge image in case of each one of a predetermined number of consecutively analyzed images does not result in an indication of possible tampering.
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Citations
25 Claims
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1. A method for identifying possible tampering of a camera view, said method comprising:
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receiving an image for analysis from an image sequence, converting the received image into an edge image, generating a similarity value indicating a level of similarity between said edge image and a reference edge image, indicating possible tampering of the camera view if the similarity value is within a specified tampering range, updating the reference edge image by combining a recently analyzed edge image with the reference edge image in case of each one of a predetermined number of consecutively analyzed images does not result in an indication of possible tampering, counting the number of consecutively analyzed images resulting in an indication of possible tampering, and generating an alarm signal in case of each one of a predetermined number of consecutively analyzed images does result in an indication of possible tampering, wherein said predetermined number is larger than one. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 22, 24, 25)
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12. A module for identifying possible camera tampering, said module comprising:
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means for receiving an image for analysis from an image sequence, and an edge image generator arranged to convert a received image into an edge image, the module being characterized by; a correlation evaluator arranged to generate a similarity value indicating a level of similarity between an edge image and a reference edge image and to indicate possible tampering of the camera view if the similarity value is within a specified tampering range, a reference edge image updater arranged to update the reference edge image by combining a recently analyzed edge image with the reference edge image in case of each one of a predetermined number of consecutively analyzed images do not result in an indication of possible tampering, a counter arranged to count the number of consecutively analyzed images resulting in an indication of possible tampering, and an alarm signal generator arranged to generate an alarm signal in case of each one of a predetermined number of consecutively analyzed images do result in an indication of possible tampering, wherein said predetermined number is larger than one. - View Dependent Claims (13, 14, 15, 16, 17, 18, 19, 20, 21, 23)
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Specification