hree small dots and two squares.
</p></dd><dt>
UniformNoise
</dt><dd><p>
Random i.i.d. noise.
</p></dd></dl><p>
Blobs:
</p><pre>
  Gaussian blobs of various sizes and anisotropies.
</pre><p>
Blobs1:
</p><pre>
  Gaussian blobs of various orientations and anisotropies.
</pre><p>
Blob:
</p><pre>
  One Gaussian blob. Use the option-value pairs 'sigma',
  'orientation', and 'anisotropy' to specify the respective
  parameters. 'sigma' is the scalar standard deviation of an
  isotropic blob (the image domain is th