CIO noise80

FIGURE 8 Experiments with a synthetic texture with periodicity 10 along each axis, and with various levels of additive uniform noise. The orientation histograms calculated by the GD method are presented as 3D structures and in projection on the plane z = 0.

That is why the indicatrix of the GD method in the absence of noise consists of spikes, whereas the indicatrix of INV is rounder, i.e., it has nonzero values in almost all directions, since it projects even well-ordered gradients on all sampling directions. This makes the INV method rather an inappropriate tool for studying anisotropy of microtextures: It is too robust for the job. This conclusion will be reinforced in the next section, where real images are used for experimentation.

0 0

Post a comment