Efficient forehead temperature estimation method based on wide-spectrum human forehead imaging and distance sensing

A distance-sensing, wide-spectrum technology, applied in the field of non-contact human body temperature measurement, can solve problems such as complex calculations, failure to meet epidemic prevention requirements, and high cost, and achieve efficient calculations, avoid thermal induction interference, and low hardware costs.

Active Publication Date: 2020-08-04
贵州安防工程技术研究中心有限公司 +1
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Problems solved by technology

The infrared temperature measurement method in the prior art is complex in calcula

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  • Efficient forehead temperature estimation method based on wide-spectrum human forehead imaging and distance sensing
  • Efficient forehead temperature estimation method based on wide-spectrum human forehead imaging and distance sensing
  • Efficient forehead temperature estimation method based on wide-spectrum human forehead imaging and distance sensing

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Embodiment Construction

[0013] Such as figure 1 , 2 As shown in 3 and 3, the high-efficiency forehead temperature estimation method based on wide-spectrum human forehead imaging and distance perception according to the present invention works when the mid-infrared imaging of the human face area and the imaging distance have been obtained.

[0014] Fundamental:

[0015] The energy value f of the forehead area image in the mid-infrared band has the following relationship with the forehead temperature T and the distance d between the infrared imager and the human forehead: ln f=αlnT-βlnd+γ (α, β, γ are coefficients). Therefore, the temperature measurement model z=ax+by+c (a, b, c are coefficients) can be obtained, where z=ln T, x=ln f, y=ln d. The energy value f of the forehead region image can be represented by the mean value of all pixels in the infrared light image of the human forehead.

[0016] As long as the forehead temperature of m people, the energy value of the forehead area image and the d...

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Abstract

The invention discloses an efficient forehead temperature estimation method based on wide-spectrum human forehead imaging and distance sensing, and provides the scheme for solving a problem of complexcalculation of forehead temperature measurement in the prior art. The method comprises a neural network training step, a step of calculating an optimal value of a coefficient in a temperature measurement model, a step of performing forehead region image interception and energy value calculation by using a neural network, a step of obtaining a distance of an object human body, and a step of calculating the temperature of the object human body by using the temperature measurement model. The method is suitable for a whole mid-infrared spectrum range, efficient in calculation and low in hardwarecost. Compared with other areas of a human face, the mid-infrared imaging of the forehead region of the human body not only contains stable temperature information, but also can effectively avoid thermal induction interference caused by shielding of glasses and masks possibly worn on the human face. The method can be used for forehead temperature estimation of multiple persons, which means that when multiple persons exist in a scene, after infrared imaging and imaging distances in face regions of different persons are obtained, a forehead temperature value of each person can be rapidly calculated.

Description

technical field [0001] The invention relates to a non-contact human body temperature measurement technology, in particular to an efficient forehead temperature estimation method based on wide-spectrum human forehead imaging and distance perception. Background technique [0002] Human forehead imaging based on mid-infrared broad spectrum is technically easy to implement. Compared with other body temperature measurement technologies, temperature estimation based on mid-infrared imaging has the advantages of low hardware cost and wide application range. Rapid human body temperature monitoring and screening of feverish personnel. In particular, this technology has good applicability in epidemics with fever characteristics such as new coronavirus pneumonia. The infrared temperature measurement method in the prior art is complex in calculation and high in cost, and cannot well meet the requirements of epidemic prevention. Contents of the invention [0003] In order to solve t...

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Application Information

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IPC IPC(8): G01J5/00G06K9/00G06K9/20G06N3/04G06N3/08
CPCG01J5/0003G01J5/0025G06N3/04G06N3/08G01J2005/0077G06V40/171G06V10/143Y02T10/40
Inventor 犹津徐勇
Owner 贵州安防工程技术研究中心有限公司
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