It automatically disregards outliers as quadruples that contain outlier pixels
will produce values (a,b) that will be accumulated in cells
which will not form a significant peak.
If two or more different mixtures are present in the mixed set, there will
be two or more significant peaks that emerge in the accumulator array. By
identifying the quadruples of pixels that voted for each peak, we cannot
only identify the mixing proportions, but also separate the two mixtures.
Figure 12 shows an example of an accumulator array with two main peaks. Figure
13 shows the same array as a grey image where the two peaks are the two brightest
spots.
