FIELD-OF-VIEW CHANGE DETECTION
First Claim
1. A computer-implemented method for detecting a field-of-view change for a video feed, comprising:
- receiving a stable background scene acquired from a plurality of images of the video feed;
receiving a new image from the video feed;
converting the stable background scene to a gray scale representation to produce a converted stable background scene;
extracting features representing image characteristics from the converted stable background scene to produce extracted features, wherein each extracted feature is associated with a position of a pixel; and
producing a field-of-view change signal that indicates if a field-of-view change has occurred in the video feed based on the extracted features, the converted stable background scene, and the new image.
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Abstract
Techniques are disclosed for detecting a field-of-view change for a video feed. These techniques differentiate between a new or changed scene and a temporary variation in the scene to accurately detect field-of-view changes for the video feed. A field-of-view change is detected when the position of a camera providing the video feed changes, the video feed is switched to a different camera, the video feed is disconnected, or the camera providing the video feed is obscured. A false-positive field-of-view change is not detected when the scene changes due to a sudden variation in illumination, obstruction of a portion of the camera providing the video feed, blurred images due to an out-of-focus camera, or a transition between bright and dark light when the video feed transitions between color and near infrared capture modes.
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Citations
20 Claims
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1. A computer-implemented method for detecting a field-of-view change for a video feed, comprising:
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receiving a stable background scene acquired from a plurality of images of the video feed; receiving a new image from the video feed; converting the stable background scene to a gray scale representation to produce a converted stable background scene; extracting features representing image characteristics from the converted stable background scene to produce extracted features, wherein each extracted feature is associated with a position of a pixel; and producing a field-of-view change signal that indicates if a field-of-view change has occurred in the video feed based on the extracted features, the converted stable background scene, and the new image. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10)
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11. A computer-readable storage medium containing a program which, when executed by a processor, performs an operation for detecting a field-of-view change for a video feed, the operation comprising:
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receiving a stable background scene acquired from a plurality of images of the video feed; receiving a new image from the video feed; converting the stable background scene to a gray scale representation to produce a converted stable background scene; extracting features representing image characteristics from the converted stable background scene to produce extracted features, wherein each extracted feature is associated with a position of a pixel; and producing a field-of-view change signal that indicates if a field-of-view change has occurred in the video feed based on the extracted features, the converted stable background scene, and the new image. - View Dependent Claims (12, 13, 14, 15)
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16. A system, comprising:
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a video input source configured to capture images included in the video feed; a processor; and a memory containing a program, which, when executed on the processor is configured to perform an operation for detecting a field-of-view change for the video feed, the operation comprising; receiving a stable background scene acquired from a plurality of images of the video feed; receiving a new image from the video feed; converting the stable background scene to a gray scale representation to produce a converted stable background scene; extracting features representing image characteristics from the converted stable background scene to produce extracted features, wherein each extracted feature is associated with a position of a pixel; and producing a field-of-view change signal that indicates if a field-of-view change has occurred in the video feed based on the extracted features, the converted stable background scene, and the new image. - View Dependent Claims (17, 18, 19, 20)
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Specification