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Fig. 3. (A) Thermogram of an Ord's kangaroo rat Dipodomys ordii taken in a
laboratory enclosure set at 15°C, scaled to represent an 80° field of
view with the animal 25 cm distant. (B–D) The results of convoluting
that image with circular spread functions with the indicated half-angles
i). (E) The same animal imaged at 30°C. Both A and E use
the same color representation of temperature and are marked with the full
range of temperatures visible in each. (F–H) The results of convoluting
that image. The color steps in B–D and F–H indicate temperature
contrasts of 0.001°C. While spatial resolution is good at 15°C for the
hypothetical i=5°(D), contrast is only 0.003°C and
the kangaroo rat is essentially invisible at 30°C (H). Temperature
contrast is somewhat greater for i=10° and 20°,
0.006°C in the 15°C cabinet, and 0.002–0.003°C in the
30°C cabinet.
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