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d
Fig. 3.8a-d. Entropy of the reference image. a No extra noise is added. b Gaussian noise with
variance equal to 1 is added. c Gaussian noise with variance equal to 3 is added. d Gaussian
noise with variance equal to 7 is added. In each case, y axis represents entropy and x axis
the displacement in pixels
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d
Fig. 3.9a-d. Joint entropy of the floating and reference images. a No extra noise is added. b
Gaussian noise with variance equal to 1 is added. c Gaussian noise with variance equal to 3
is added. d Gaussian noise with variance equal to 7 is added. In each case, x axis represents
the displacement in pixels