def isolate(self,frame):
blobs = []
grayscale = cv2.cvtColor( frame.data, cv2.COLOR_BGR2GRAY )
rectangles = self.cascade.detectMultiScale( grayscale, scaleFactor=1.2, minNeighbors=3, minSize=self.min_size)
for r in rectangles:
b = Blob( self.get_estimation_id() )
b.x, b.y = r[0:2]
b.w, b.h = r[2:4]
blobs.append(b)
return blobs
