Since hold-short lines often
occur in a rectangular window of size 600 by 200 pixels, two
windows are searched, one with (PeakX, PeakY-100) as the
top right corner (left window), and the other with PeakX,
PeakY-100) as the top left corner (right window). The number
of midpoints in these two windows are computed respectively,
and if the count is larger than our threshold of 5 in any of
them, it is determined that hold-short lines are present.
Since hold-short lines oftenoccur in a rectangular window of size 600 by 200 pixels, twowindows are searched, one with (PeakX, PeakY-100) as thetop right corner (left window), and the other with PeakX,PeakY-100) as the top left corner (right window). The numberof midpoints in these two windows are computed respectively,and if the count is larger than our threshold of 5 in any ofthem, it is determined that hold-short lines are present.
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