April 2019
Intermediate to advanced
336 pages
8h 22m
English
Content preview from OpenCV 4 for Secret Agents - Second Edition
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Seeing things in different light
Although we began this chapter by presenting Eulerian video magnification as a useful technique for visible light, it is also applicable to other kinds of light or radiation. For example, a person's blood beneath the skin (in veins and bruises) is more visible when imaged in ultraviolet (UV) or in near infrared (NIR) than in visible light. This is because blood is darker in UV light than in visible light, and skin is more transparent in NIR light than in visible light. Thus, a UV or NIR video might be an even better input when trying to magnify a person's pulse.
We will experiment with invisible light in the next chapter, Chapter 8, Stopping Time and Seeing like a Bee. Q's gadgets will inspire us once again! ...
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