Humanoid detector and method that senses infrared radiation and subject size
First Claim
1. A humanoid detector, comprising:
- (a) a moving body detection sensor that detects a moving body in a first surveillance area and provides a moving body signal when a detected moving body exceeds a predetermined size;
(b) an infrared sensor that detects infrared radiation within a second surveillance area and provides an infrared detection signal when detected infrared radiation levels exceed a predetermined value; and
(c) a human body detection circuit that receives the moving body signal and the infrared detection signal, and provides a decision signal indicating that a humanoid body is in the first or second surveillance areas when the moving body detection sensor provides the moving body signal and the infrared sensor provides the infrared detection signal simultaneously.
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Accused Products
Abstract
A humanoid detector for detecting a humanoid in a surveillance area that substantially reduces false intruder indications by having two types of sensors that provide two types of information of the surveillance area, is disclosed. A first sensor detects light images and determines a size of a moving object within the surveillance area and compares the size of detected moving objects to a threshold size to reduce intruder detection caused by small animals. A second sensor detects infrared radiation from the surveillance area provides a detected infrared radiation signal. A decision circuit receives the sensor signals and provides a decision signal that indicates a human intruder in the surveillance area when, simultaneously, the size of the moving body is greater than that of a small animal and the detected infrared radiation indicates that the moving body is a heat producing body. In order to compensate for differences in the sensors and to account for different physical properties in the surveillance area, the decision circuit holds high an intruder signal for a predetermined time from each sensor. Thus, if a signal occurs that indicates a moving body is larger than a small animal, that signal is held for a predetermined time interval and if a signal indicates a sufficient increase in the infrared radiation occurs while the moving body signal is being held, then the decision circuit determines that a human intruder has entered the surveillance area. The decision signal may be used to trigger an audible or visible indication.
40 Citations
29 Claims
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1. A humanoid detector, comprising:
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(a) a moving body detection sensor that detects a moving body in a first surveillance area and provides a moving body signal when a detected moving body exceeds a predetermined size; (b) an infrared sensor that detects infrared radiation within a second surveillance area and provides an infrared detection signal when detected infrared radiation levels exceed a predetermined value; and (c) a human body detection circuit that receives the moving body signal and the infrared detection signal, and provides a decision signal indicating that a humanoid body is in the first or second surveillance areas when the moving body detection sensor provides the moving body signal and the infrared sensor provides the infrared detection signal simultaneously. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9)
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10. A human body detection method, comprising the steps:
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(a) detecting a moving subject using a visible light image of a surveillance area; (b) detecting infrared radiation in the surveillance area; and (c) determining a size of the mov ing subject; and (d) providing a decision signal that is indicative of a human body in the surveillance area when the size of the moving subject exceeds a predetermined size and the detected infrared radiation exceeds a predetermined value simultaneously. - View Dependent Claims (11, 12, 13, 14, 15, 16, 17)
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18. A humanoid detector, comprising:
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(a) a first sensor that receives incident light from a surveillance area and provides a first signal indicative of motion of a subject body in the surveillance area; (b) a second sensor that receives infrared radiation from the surveillance area and provides a second signal indicative of the infrared radiation from the surveillance area; and (c) decision circuits that receive the first and second signals, determine whether the first and second signals exceed respective first and second threshold values and provide a decision signal that indicates that a humanoid is present in the surveillance area when the first and second signals exceed their respective first and second threshold values simultaneously. - View Dependent Claims (19, 20, 21, 22, 23, 24, 25, 26, 27, 28)
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29. A humanoid detector, comprising:
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(a) a first sensor having a plurality of solid-state pixel elements that convert incident light from a surveillance area into electrical signals and including a difference detection circuit that compares time sequenced electrical signals from the pixel elements to determine if a change in luminescence level occurs at each pixel element and wherein the first sensor provides a first signal indicative of the change in luminescence level; (b) a second sensor comprising an infrared sensor that detects infrared radiation within the surveillance area and provides a second signal that is indicative of the detected infrared radiation; and (c) a human body detection circuit that receives the first and second signals and that uses the first signal to determine a size of a subject area within the surveillance area in which the luminescence level changed and that provides a decision signal that indicates a humanoid presence in the surveillance area when the size of the subject area exceeds a predetermined size and the second signal exceeds a predetermined value simultaneously.
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Specification