Real-time recursive filter to identify weather events using traffic CCTV video
First Claim
Patent Images
1. A processor for executing the following steps:
- receiving images of a scene comprising successive frames from a camera, each frame including an array of pixels;
filtering intensities of the array of pixels in a respective frame by using a Bessel Filter to compute a constant value for the respective frame, andsumming a predetermined number of respective frames from the camera to determine rapid motion in the scene,wherein the rapid motion in the scene is a weather-related event, including motion of a rain fall, a hail storm, a snow storm, or a tornado, which is provided as notification to a remote station, andthe filtering is implemented using the following recursive relationship;
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Abstract
A program is implemented on a processor for executing the following steps: receiving images of a scene comprising successive frames from a camera, each frame including an array of pixels; filtering intensities of the array of pixels in a respective frame by using a Bessel Filter to compute a constant value for the respective frame; and summing a predetermined number of respective frames from the camera to determine rapid motion in the scene. The filter includes a Bessel filter, which is an n-pole recursive digital filter, where n is a positive integer.
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Citations
19 Claims
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1. A processor for executing the following steps:
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receiving images of a scene comprising successive frames from a camera, each frame including an array of pixels; filtering intensities of the array of pixels in a respective frame by using a Bessel Filter to compute a constant value for the respective frame, and summing a predetermined number of respective frames from the camera to determine rapid motion in the scene, wherein the rapid motion in the scene is a weather-related event, including motion of a rain fall, a hail storm, a snow storm, or a tornado, which is provided as notification to a remote station, and the filtering is implemented using the following recursive relationship; - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10)
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11. A system for extracting weather-related events from a camera comprising:
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a closed circuit television (CCTV) camera for monitoring a scene, a filter for low pass filtering successive frames of the scene captured by the CCTV camera, the filter including a Bessel function for computing constant values for the successive frames of the scene, and assigning a computed constant value to each of the successive frames, wherein a respective computed constant value multiplied by the intensities of a respective frame is defined as a filtered frame of the scene, and a summer for summing a predetermined number of filtered frames of the scene, wherein the summer is effective in determining rapid motion in the scene. - View Dependent Claims (12, 13, 14, 15)
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16. A method of extracting weather-related events from a camera comprising:
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receiving successive frames captured by a closed circuit television (CCTV) camera of a scene, filtering the successive frames of the scene captured by the CCTV camera by using a Bessel function for computing constant values for the successive frames of the scene, assigning a computed constant value to each of the successive frames, multiplying a respective computed constant value by intensities of the respective frame, wherein a result of the multiplying is defined as a filtered frame, summing a predetermined number of filtered frames of the scene, and determining rapid motion from the filtered frames of the scene. - View Dependent Claims (17, 18, 19)
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Specification