FEVER DETECTION
Systems, methods, and apparatuses to detect persons having fever. For example, A fever scanner can have a thermal camera to capture a thermal image of a person, a distance sensor to measure a distance between the person and the fever scanner, and a processor to determine a first temperature from the thermal image and calculate a second temperature of the person based on the first temperature and the distance. When the second temperature is above a threshold, the fever scanner can generate an alert.
1 . A fever scanner, comprising:
a thermal camera configured to capture a thermal image of a person; and
a distance sensor configured to measure a distance between the person and the fever scanner;
wherein the fever scanner is configured to determine a first temperature from the thermal image and calculate a second temperature of the person based on the first temperature and the distance.
2 . The fever scanner of claim 1 , wherein the distance sensor includes an optical camera configured to sense lights visible to human eyes and reflected from the person.
3 . The fever scanner of claim 2 , wherein the thermal camera is configured to sense intensity of infrared radiation from the person.
4 . The fever scanner of claim 3 , wherein the first temperature is based on the intensity of the infrared radiation; and the second temperature is calculated based on an empirical formula as a function of the distance.
5 . The fever scanner of claim 4 , wherein the empirical formula provides a difference between the first temperature and the second temperature; and the difference is a linear function of the distance.
6 . The fever scanner of claim 2 , wherein the optical camera is configured to capture an optical image of the person; and the distance sensor is configured to recognize a face portion of the person in the optical image and determine the distance based on the face portion.
7 . The fever scanner of claim 6 , wherein the face portion of the person in the optical image is identified using an artificial neural network.
8 . The fever scanner of claim 6 , wherein the distance sensor is configured to determine a size of the face portion in the optical image and calculates the distance based on the size of the face portion.
9 . The fever scanner of claim 2 , wherein the optical camera is configured to capture an optical image of the person; and the distance sensor is configured to determine the distance by applying the optical image as an input to an artificial neural network.
10 . The fever scanner of claim 9 , further comprising:
a user interface configured to provide an alert when the second temperature is above a threshold.
11 . The fever scanner of claim 10 , wherein the user interface is configured to present the optical image with an outline indicating a preferred location of an outline of the person in the optical image; and the user interface is further configured to present the thermal image concurrently with the optical image being presented in the user interface.
12 . The fever scanner of claim 1 , wherein the distance sensor includes a depth camera or an ultrasound generator.
13 . A method, comprising:
capturing, using a thermal camera, a thermal image of a person; and
measuring, using a distance sensor, a distance between the person and the thermal camera;
determining a first temperature from the thermal image; and
calculating a second temperature of the person based on the first temperature and the distance.
14 . The method of claim 13 , wherein the measuring of the distance includes:
capturing, using an optical camera, an optical image of the person;
recognizing a face portion of the person in the optical image; and
determining the distance based on the recognizing of the face portion.
15 . The method of claim 14 , wherein the recognizing of the face portion is performed using an artificial neural network.
16 . The method of claim 15 , wherein the distance is an output from the artificial neural network.
17 . An apparatus, comprising:
a housing adapted to position the apparatus at a fixed location facing a person arriving at a vicinity of the location;
a thermal camera configured on the housing, the thermal camera to generate a thermal image of the person;
an optical camera configured on the housing, the optical camera to generate an optical image of the person;
a processor configured to determine a distance between the apparatus and the person, determine a first temperature from the thermal image and a second temperature of the person based on the first temperature and the distance; and
a user interface configured to generate an alert when the second temperature is above a threshold.
18 . The apparatus of claim 17 , wherein the processor is configured within the housing; and the distance is using an artificial neural network.
19 . The apparatus of claim 18 , wherein a resolution of the optical camera is greater than a resolution of the thermal camera.
20 . The apparatus of claim 19 , wherein the first temperature is determined based on infrared radiation in an area identified according to a facial area of the person in the optical camera.