Back to results
US 12,646,351 B2Granted
Human falling detection employing thermal sensor and image sensor
AssigneePixart Imaging Inc.
InventorsFeng-Chi Liu, Nien-Tse Chen
Life of this patent
Estimating the term…
Abstract
There is provided a human falling detection system including an image sensor, a thermal sensor and a microphone. The image sensor captures an image frame that is used to identify a face and a height-width ratio of a human image. The thermal sensor is used as a filter for filtering out a living body and captures a thermal image that is used to identify a height-width ratio of a human thermal image. The microphone records a time stamp of an abrupt sound appearing.
Claims20
A falling detection system, comprising:
- an image sensor, configured to output an image frame;
- a thermal sensor, configured to output a thermal image;
- a microphone, configured to output a voice signal;
- and
- a processor, coupled to the image sensor, the thermal sensor and the microphone, and configured to
- tag an object image in the thermal image as an object of interest for continuous tracking upon a height-width ratio of the object image being within a predetermined ratio range,
- after the object of interest is tagged, identify whether the object of interest is a living body or not according to the thermal image,
- identify a height-width ratio change in the height-width ratio of the object of interest upon the object of interest being identified as the living body, and
- identify whether a time stamp of the height-width ratio change matches a time point of an abrupt sound occurring in the voice signal.
6 more elements
A falling detection system, comprising:
- an image sensor, configured to output an image frame;
- a thermal sensor array, configured to output a thermal image;
- a microphone, configured to output a voice signal;
- and
- a processor, coupled to the image sensor, the thermal sensor array and the microphone, and configured to perform a falling detection by
- tagging an object as an object of interest for continuous tracking upon a human face being recognized by face recognition in the image frame and upon a height-width ratio of a thermal object image in the thermal image corresponding to the human face is within a predetermined ratio range,
- after the object of interest is tagged, identifying whether the object of interest is a living body or not according to the thermal object image in the thermal image,
- identifying a height-width ratio change in the height-width ratio of the thermal object image in the thermal image associated with the object of interest upon the object of interest being identified as the living body, and
- identifying whether a time stamp of the height-width ratio change matches a time point of an abrupt sound occurring in the voice signal.
6 more elements
A falling detection system, comprising:
- an image sensor, configured to output an image frame;
- a thermal sensor array, configured to output a thermal image;
- a microphone, configured to output a voice signal;
- and
- a processor, coupled to the image sensor, the thermal sensor array and the microphone, and configured to
- tag a thermal object image in the thermal image as an object of interest for continuous tracking upon a height-width ratio of the thermal object image being within a predetermined ratio range when an object image in the image frame is identified as a living body according to the thermal object image in the thermal image corresponding to the object image having a temperature between 35° C. and 40° C., and
- identify a human falling event according to a time point of an abrupt sound in the voice signal in conjunction with at least one of a face position change of the object image in successive image frames acquired by the image sensor and a height-width ratio change of the thermal object image in successive thermal images acquired by the thermal sensor array.
4 more elements
Dependencies are inferred from the claim text.