import cv2
import numpy as np

img = cv2.imread('/home/pzs/圖片/test.jpg')
gray = cv2.cvtColor(img, cv2.COLOR_BGR2GRAY)
thresh, binary = cv2.threshold(gray, 180, 255, cv2.THRESH_BINARY_INV)
binary, contours, hierarchy = cv2.findContours(binary, cv2.RETR_TREE, cv2.CHAIN_APPROX_NONE)
cv2.imshow('binary', binary)
cv2.waitKey(0)

for cnt in contours:
? ? x,y,w,h = cv2.boundingRect(cnt)
? ? cv2.rectangle(img, (x, y), (x+w, y+h), (0, 255, 0), 1)

cv2.imshow('image', img)
cv2.waitKey(0)

②. 最小外接矩形

import cv2
import numpy as np

img = cv2.imread('/home/pzs/圖片/test.jpg')
gray = cv2.cvtColor(img, cv2.COLOR_BGR2GRAY)
thresh, binary = cv2.threshold(gray, 180, 255, cv2.THRESH_BINARY_INV)
binary, contours, hierarchy = cv2.findContours(binary, cv2.RETR_TREE, cv2.CHAIN_APPROX_NONE)
cv2.imshow('binary', binary)
cv2.waitKey(0)

for cnt in contours:
? ? rect = cv2.minAreaRect(cnt)
? ? box = cv2.boxPoints(rect)
? ? box = np.int0(box)
? ? cv2.drawContours(img, [box], 0, (0, 0, 255), 2)


cv2.imshow('image', img)
cv2.waitKey(0)

③. 最小外接圓

import cv2
import numpy as np

img = cv2.imread('/home/pzs/圖片/test.jpg')
gray = cv2.cvtColor(img, cv2.COLOR_BGR2GRAY)
thresh, binary = cv2.threshold(gray, 180, 255, cv2.THRESH_BINARY_INV)
binary, contours, hierarchy = cv2.findContours(binary, cv2.RETR_TREE, cv2.CHAIN_APPROX_NONE)
cv2.imshow('binary', binary)
cv2.waitKey(0)

for cnt in contours:
? ? (x, y), radius = cv2.minEnclosingCircle(cnt)
? ? center = (int(x), int(y))
? ? radius = int(radius)
? ? cv2.circle(img, center, radius, (255, 0, 0), 2)

cv2.imshow('image', img)
cv2.waitKey(0)

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