Low power motion detection system
First Claim
Patent Images
1. A low power motion detection system, comprising:
- a low-resolution image sensor having a normal mode and a low power consumption sleep mode, the sensor configured to periodically exit the sleep mode and enter the normal mode, capture a low-resolution image of a scene in the normal mode, and then return to the sleep mode; and
a controller for determining whether motion has occurred based on images captured by the sensor.
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Abstract
A low power motion detection system includes a low-resolution image sensor having a normal mode and a low power consumption sleep mode. The sensor is configured to periodically exit the sleep mode and enter the normal mode, capture a low-resolution image of a scene in the normal mode, and then return to the sleep mode. The system includes a controller for determining whether motion has occurred based on images captured by the sensor.
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Citations
21 Claims
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1. A low power motion detection system, comprising:
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a low-resolution image sensor having a normal mode and a low power consumption sleep mode, the sensor configured to periodically exit the sleep mode and enter the normal mode, capture a low-resolution image of a scene in the normal mode, and then return to the sleep mode; and
a controller for determining whether motion has occurred based on images captured by the sensor. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12)
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13. A method of detecting motion, comprising:
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(a) providing a low-resolution image sensor having a normal mode and a low power consumption sleep mode;
(b) switching from the sleep mode to the normal mode;
(c) capturing a sample frame of a scene with the image sensor in the normal mode;
(d) determining whether motion has occurred based on the sample frame and a previously captured reference frame; and
(e) switching from the normal mode to the sleep mode. - View Dependent Claims (14, 15, 16, 17)
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18. A method of detecting motion with an image sensor, comprising:
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(a) capturing a sample frame of a scene with the image sensor;
(b) identifying a difference between the sample frame and a current reference frame of the scene;
(c) identifying whether the difference is greater than a threshold value;
(d) generating a motion detection indication if the difference is greater than the threshold;
(e) replacing the current reference frame with the sample frame only if the difference is greater than the threshold, thereby making the sample frame the current reference frame; and
(f) periodically repeating steps (a) through (e).
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19. A motion detecting control switch apparatus for controlling a power state of a device, the switch comprising:
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a motion sensor for capturing images of a scene and detecting motion based on the captured images; and
a first user input device for selecting an on state, an off state, and a motion state, wherein selection of the on state causes the device to be powered on, selection of the off state causes the device to be powered off, and selection of the motion state causes the power state of the device to be controlled by the motion sensor. - View Dependent Claims (20, 21)
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Specification