find the circularity of diamond, inverted triangle and octagon shape
1 Ansicht (letzte 30 Tage)
Ältere Kommentare anzeigen
hi,currently I working with road sign sign detection, based on the observations from regionprops of matlab value, to detect circular shape, the circularities should be < 1.2, for square shape, circularities <1.6 and triangle shape should be <1.8
Can I know what is the circularities values for diamond , inverted triangle and octagon shapes respectively?
0 Kommentare
Antworten (1)
Image Analyst
am 15 Okt. 2012
Circularity is obtained by solving for the radius in terms of both the perimeter and area for a circle:
P = 2*pi*r
r = P/(2*pi)
A = pi*r^2
r = sqrt(A/pi) = P/(2*pi)
A/pi = P^2 / (4*pi^2)
1 = p^2 / (4*pi*A) = circularity
circularity = Perimeter^2 / (4 * pi * Area)
To find out what it is for those shapes, just create those shapes, and measure the perimeter and area.
Siehe auch
Kategorien
Mehr zu Loops and Conditional Statements finden Sie in Help Center und File Exchange
Produkte
Community Treasure Hunt
Find the treasures in MATLAB Central and discover how the community can help you!
Start Hunting!