Temperature measuring device and temperature measuring method

A temperature measuring device comprising:

• processing circuitry:
• to irradiate with thermal infrared light a target whose temperature needs to be measured;
• to acquire a thermal infrared illumination image including an image of the target irradiated with the thermal infrared light;
• to acquire a thermal infrared image including the image of the target;
• to irradiate the target with distance measurement illumination light for measuring a distance;
• to acquire a distance image including the image of the target irradiated with the distance measurement illumination light;
• to calculate an image expansion amount of the image of the target based on the image of the target in the acquired distance image and the image of the target in the acquired thermal infrared illumination image;
• to add the calculated image expansion amount in the acquired thermal infrared image to luminance of the image of the target;
• to acquire a distance to the target based on the acquired distance image;
• to acquire emissivity of the target based on the acquired distance;
• and
• to measure a temperature of the target based on the image of the target to which the image expansion amount has been added, and the acquired emissivity of the target.

A temperature measuring device comprising:

• processing circuitry:
• to irradiate with thermal infrared light a target whose temperature needs to be measured;
• to acquire a thermal infrared illumination image including an image of the target irradiated with the thermal infrared light;
• to acquire a thermal infrared image including the image of the target;
• to acquire a visible light image including the image of the target;
• to irradiate the target with distance measurement illumination light for measuring a distance;
• to acquire a distance image including the image of the target irradiated with the distance measurement illumination light;
• to calculate an image expansion amount of the image of the target based on one of the image of the target in the acquired visible light image and the image of the target in the acquired distance image, and the image of the target in the acquired thermal infrared illumination image;
• to add the calculated image expansion amount in the thermal infrared image to luminance of the image of the target;
• to acquire a distance to the target based on the acquired distance image;
• to acquire emissivity of the target based on the acquired distance;
• and
• to measure a temperature of the target based on the image of the target to which the image expansion amount has been added, and the calculated emissivity of the target.