如何知道从“find contour”函数获取的轮廓在opencv中是打开的还是关闭的?
更新
我试图将isContourConvex应用于此图像:https://docs.google.com/file/d/0ByS6Z5WRz-h2RXdzVGtXUTlPSGc/edit?usp=sharing
i提取最大面积的轮廓 并返回false。 我改变,也许,轮廓提取,扩张?
nomeimg = 'Riscalate2/JPEG/e (5).jpg'
img = cv2.imread(nomeimg)
gray = cv2.imread(nomeimg,0)#convert grayscale adn binarize
element = cv2.getStructuringElement(cv2.MORPH_CROSS,(6,6))
graydilate = cv2.erode(gray, element) #imgbnbin
cv2.imshow('image',graydilate)
cv2.waitKey(0)
ret,thresh = cv2.threshold(graydilate,127,255,cv2.THRESH_BINARY_INV) # binarize
imgbnbin = thresh
cv2.imshow('bn',thresh)
cv2.waitKey()
#element = cv2.getStructuringElement(cv2.MORPH_CROSS,(2,2))
#element = np.ones((11,11),'uint8')
contours, hierarchy = cv2.findContours(imgbnbin, cv2.RETR_TREE ,cv2.CHAIN_APPROX_SIMPLE)
print(len(contours))
# Take only biggest contour basing on area
Areacontours = list()
calcarea = 0.0
unicocnt = 0.0
for i in range (0, len(contours)):
area = cv2.contourArea(contours[i])
#print("area")
#print(area)
if (area > 90 ): #con 90 trova i segni e togli puntini
if (calcarea<area):
calcarea = area
unicocnt = contours[i]
convex = cv2.isContourConvex(unicocnt)
print("convex")
print(convex)
你在寻找术语concave(像C)与convex(像O)的轮廓。
你猜怎么着,有一种检查凸性的方法:
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