Visualisations and Covers
This chapter introduces various ways to visualise digital images. For example, the distribution of pixel orientations in a tree nymph butterfly (genus idea, species I.leuconoe, family nymphalidae) is shown in Fig. 3.1.1 and the distribution of pixel orientations for a red admiral butterfly (genus vanessa, species atalanta, family nymphalidae) is shown in Fig. 3.1.2 (see MathScript 6 in Appendix A.3 for the Mathematica script used to produce these distributions). By itself, the distribution in Fig. 3.1.1 is interesting, since it indicates the dominance of negative pixel orientations in the tree nymph butterfly (at rest). By contrast, the pixel orientations of the red admiral butterfly (at rest) in Fig. 3.1.2 aremarkedly less negative.This form of visualisation is useful in the case where a pair of images are compared and classified, based on pixel orientations.
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