area,perimeter,center,radius and curvature of objects or contours

Author: keshavsingh4522

Linkedin/Opencv/contours/area_perimeter_radius.py

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+# Area, Perimeter, Center, Curvature
+import numpy as np
+import cv2
+
+img=cv2.imread('detect_blob.png')
+gray=cv2.cvtColor(img,cv2.COLOR_BGR2GRAY)
+thresh=cv2.adaptiveThreshold(gray,255,cv2.ADAPTIVE_THRESH_GAUSSIAN_C,cv2.THRESH_BINARY,115,1)
+_,contours,hierarchy=cv2.findContours(thresh,cv2.RETR_TREE,cv2.CHAIN_APPROX_SIMPLE)
+
+img2=img.copy()
+color=(123,255,61)
+index=-1
+tk=2
+frame=np.zeros([img.shape[0],img.shape[1],3],'uint8')
+i=1
+for c in contours:
+    cv2.drawContours(frame,[c],index,color,tk)
+    area=cv2.contourArea(c)
+    arclength=cv2.arcLength(c,True)
+    print('{} Area: {},  perimeter: {}'.format(i,area,arclength))
+    i+=1
+    m=cv2.moments(c)
+    cx=int(m['m10']/m['m00'])
+    cy=int(m['m01']/m['m00'])
+    cv2.circle(frame,(cx,cy),1,(0,0,255),-1)
+    cv2.imshow('Original',frame)
+
+cv2.waitKey(0)
+cv2.destroyAllWindows()