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Fig. 12.8
Bimodal
histogram
Fig. 12.9
Histogram of
Fig.
12.6
The result shown in Fig.
12.10
was obtained by the application of a segmen-
tation technique that uses the smallest value between the two higher picks of the
histogram (Fig.
12.9
).
Due to uniformity of the brightness values around the ice in the image and the
features inside the water, it was necessary to use a more accurate algorithm to
determine the ice and water area in the experiment. Region growing method is not
adequate because it forms distinguished regions by combining pixels with similar
grayscale intensity. Observing the Fig.
12.6
, it can be noted that many small
regions could be highlighted. For that reasons, the chosen algorithm used to
separate ice and water is a boundary enhancement method.
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