Infrared temperature measurement method, apparatus, and device, and storage medium

Patent metadata

Field	Value
Publication number	US-2023105139-A1
Application number	US-202117905687-A
Country	US
Kind code	A1
Filing date	Mar 4, 2021
Priority date	Mar 6, 2020
Publication date	Apr 6, 2023
Grant date	—

Abstract

Embodiments of the present application disclose an infrared temperature measurement method, apparatus, device, and storage medium, which relate to the field of image processing. The method comprises: determining a measurement temperature of a to-be-measured target based on a grayscale image captured to obtain a first measurement temperature; determining key point coordinates of the target based on a target image; determining a first distance based on the key point coordinates and configuration information of an infrared temperature measurement device, the first distance is a distance between the target and the infrared temperature measurement device; determining an actual temperature of the target based on the first measurement temperature and the first distance. In this way, the target image ranging and grayscale image temperature measurement can be combined, which not only reduces the influence of distance on the measurement temperature, but also avoids the problem of inaccurate measurement temperature when the distance does not meet the requirements, thus improving temperature measuring precision and temperature measuring efficiency.

First claim

1 . An infrared temperature measurement method, wherein, the method comprises:
determining a measurement temperature of a to-be-measured target based on a grayscale image captured to obtain a first measurement temperature; determining key point coordinates of the target based on a target image; determining a first distance based on the key point coordinates and configuration information of an infrared temperature measurement device, wherein the first distance is a distance between the target and the infrared temperature measurement device; determining an actual temperature of the target based on the first measurement temperature and the first distance.

2 . The method of claim 1 , wherein,
the target image comprises the grayscale image; or, the target image comprises a visible light image; or, the target image comprises a fusion image determined based on the grayscale image and the visible light image.

3 . The method of claim 1 , wherein, the key point coordinates of the target comprise coordinates of a first key point and coordinates of a second key point, wherein the first key point and the second key point are any two key points whose actual distance is known among key points of the target, the configuration information comprises a focal distance and a pixel size;
determining the first distance based on the key point coordinates and the configuration information of the infrared temperature measurement device, comprises: determining a horizontal distance between the first key point and the second key point in the target image, and determining a vertical distance between the first key point and the second key point in the target image, based on the coordinates of the first key point and the coordinates of the second key point to obtain a first horizontal distance and a first vertical distance; determining a second distance based on the first horizontal distance, the first vertical distance, and the pixel size, wherein the second distance is a distance between the first key point and the second key point in the target image; determining the first distance based on a first actual distance, the focal distance, and the second distance, wherein the first actual distance is an actual distance between the first key point and the second key point.

4 . The method of claim 3 , wherein, the target image comprises a visible light image, the key point coordinates are facial key point coordinates, before determining the second distance based on the first horizontal distance, the first vertical distance and the pixel size, the method further comprises:
if it is determined that a facial area of the target is not a frontal image based on the visible light image, determining a yaw angle and a pitch angle of the target; correcting the first horizontal distance based on the yaw angle and correcting the first vertical distance based on the pitch angle to obtain a second horizontal distance and a second vertical distance; determining the second distance based on the first horizontal distance, the first vertical distance, and the pixel size, comprises: determining the second distance based on the second horizontal distance, the second vertical distance, and the pixel size.

5 . The method of claim 1 , wherein, the target image comprises a visible light image, the key point coordinates are facial key point coordinates, before determining the first distance based on the key point coordinates and the configuration information of the infrared temperature measurement device, the method further comprises:
if it is determined that a facial area of the target is not a frontal image based on the visible light image, correcting the facial area based on the key point coordinates; determining key point coordinates of the corrected facial area; determining the first distance based on the key point coordinates and the configuration information of the infrared temperature measurement device, comprises: determining the first distance based on the key point coordinates of the corrected facial area and the configuration information.

6 . The method of claim 3 , wherein, determining the first distance based on the first actual distance, the focal distance, and the second distance, comprises:
multiplying the first actual distance by the focal distance to obtain a first value; dividing the first value by the second distance to obtain a second value; determining the second value as the first distance.

7 . The method of claim 1 , wherein, determining the actual temperature of the target based on the first measurement temperature and the first distance, comprises:
determining a corresponding temperature from a first mapping relationship based on the first measurement temperature and the first distance, the first mapping relationship is used for indicating a corresponding relationship among a measurement temperature, the distance between the target and the infrared temperature measurement device, and a temperature; determining the determined temperature as the actual temperature of the target; or determining a measurement temperature of a to-be-measured target based on a grayscale image captured to obtain the first measurement temperature, comprises: determining a facial area of the target in the grayscale image; obtaining an environment temperature; determining the first measurement temperature based on the environment temperature, grayscale values of pixel points in the facial area, and a specified functional relationship, the specified functional relationship is used for indicating a functional relationship among an environment temperature, a grayscale value, and a measurement temperature.

8 . (canceled)

9 . The method of claim 7 , wherein, the target image comprises a visible light image, determining the facial area of the target in the grayscale image comprises:
determining first facial area coordinates of the target in the visible light image, the first facial area coordinates are used for indicating a facial area of the target in the visible light image; determining corresponding second facial area coordinates from a second mapping relationship based on the first facial area coordinates, the second mapping relationship is used for indicating a corresponding relationship between coordinates of a pixel point in the grayscale image and coordinates of a pixel point in the visible light image; determining the facial area of the target in the grayscale image based on the second facial area coordinates; or there is a plurality of pixel points in the facial area, determining the first measurement temperature based on the environment temperature, the grayscale values of the pixel points in the facial area, and the specified functional relationship, comprises: determining a measurement temperature corresponding to each pixel point based on the environment temperature, a grayscale value of each pixel point of the plurality of pixel points, and the specified functional relationship to obtain a second measurement temperature of each pixel point; determining the first measurement temperature based on the second measurement temperature of each pixel point of the plurality of pixel points.

10 - 20 . (canceled)

21 . An infrared temperature measurement device, wherein, the infrared temperature measurement device comprises an image sensor and a processor;
the image sensor is configured for capturing a grayscale image; the processor is configured for performing the following operations: determining a measurement temperature of a to-be-measured target based on the grayscale image captured to obtain a first measurement temperature; determining key point coordinates of the target based on a target image;

Assignees

• Hangzhou Hikvision Digital Tec

Inventors

• Cai Xiaowang

Classifications

• G01J5/00

  Radiation pyrometry, e.g. infrared or optical thermometry · CPC title

• G06T7/74

  involving reference images or patches · CPC title

• G06T2207/30201

  Face · CPC title

• G06T2207/10048

  Infrared image · CPC title

• G06T2207/20081

  Training; Learning · CPC title