FMX 300X P-SERIES USER MANUAL
14
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If the weather is clear and the visibility is normal, without visible fog or haze,
there is a 50% chance of reading the target at the specified distance.
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Assume the width of a person is 0.5 m (1.64 ft), the height is 1.8 m (5 ft
9 in), and the critical distance is 0.75 m (2.46 ft). In case of the width of
the vehicle is 4.0 m (13.12 ft), the height is 1.4 m (4.59 ft), and the critical
distance is 2.3 m (7.55 ft).
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According to the Johnson criterion of infrared images, suppose:
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The detection target needs to be imaged at least 1.5 pixels in the
critical direction.
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Recognizing the target needs to image no less than 6 pixels in the
critical direction.
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Recognizing the target requires imaging no less than 12 pixels in the
critical direction.
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The actual detection distance varies with the settings of the thermal camera,
environmental conditions, user experience, monitoring or displaying type.
