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General
program idea
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Program consists of two separated
problems:
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Detecting signs on the image
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Recognizing detected regions of
possible sign locations
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Recognizing the detected signs is done in two
main steps. First step is to find a shape of an object in the area proposed by
detecting program. It is done by building a chain code. First 18 rays are going
from the center of a zone until they meet a background color. They are cast from
0 degree to 340 degrees (with 20 degrees spacing) so that the beginnings and
endings of a vectors in chain code are obtained. Than by checking the angles between
vectors we are able to detect corners of an object. If there are no corners it
is a circular sign. Three – triangular one and four – rectangular.
