Almost all “premium version” of elevated body temperature detection system available in the market seems to have both visual and thermal camera in it. I think, main reason to put this visual camera is to identify the person without any human intervention in case he or she is detected with elevated body temperature. While, this argument may not hold true if she is wearing a mask or veil, but still it can give some desirable features to elevated body temperature measurement system
Both the Thermal Camera and the visual camera are places in such a way that their field of view ( FOV ) overlap each other so as to detect the face using visual camera while sensing the temperature using the thermal camera. The visual image will be used to detect a face, then this face area will be identified in the corresponding thermal image. Then the temperature of that area will be measured using the thermal camera. … Continue Reading about Visual Camera in Body Temperature Detection System