Image Processing Reference
Figure1.47 Visible (left) and SWIR (right) images of hot and cold stove burners. (Courtesy
thermal infrared light are discussed in the next chapter, along with a description of
the special devices that enable us to see, among other things, body heat.
This chapter's exploration of the spectrum began with the near-infrared and
near-ultraviolet wavebands, since these bands are very close to the visible
waveband in wavelength, and the interaction between matter and visible, near-IR
and near-UV light is similar. Many near-IR and near-UV images are essentially
identical to visible-light images, but I purposely chose images that showed some
interesting feature or property of an object not visible to the human eye. The
following chapters will look at the world with wavelengths of light that are many
times shorter or longer than visible-light wavelengths; then the difference in the
appearance of things becomes very apparent.