轮廓中的质心(Python、OpenCV)
我有这样的图像: 我想做的是检测内部轮廓(3号)的质心 这是我现在掌握的代码:轮廓中的质心(Python、OpenCV),python,opencv,opencv-contour,Python,Opencv,Opencv Contour,我有这样的图像: 我想做的是检测内部轮廓(3号)的质心 这是我现在掌握的代码: import cv2 import numpy as np im = cv2.imread("three.png") imgray = cv2.cvtColor(im, cv2.COLOR_BGR2GRAY) ret, thresh = cv2.threshold(imgray, 127, 255, 0, cv2.THRESH_BINARY_INV | cv2.THRESH_OTSU) _, contours,
import cv2
import numpy as np
im = cv2.imread("three.png")
imgray = cv2.cvtColor(im, cv2.COLOR_BGR2GRAY)
ret, thresh = cv2.threshold(imgray, 127, 255, 0, cv2.THRESH_BINARY_INV | cv2.THRESH_OTSU)
_, contours, hierarchy = cv2.findContours(thresh, cv2.RETR_TREE, cv2.CHAIN_APPROX_NONE)
cnts = cv2.drawContours(im, contours[1], -1, (0, 255, 0), 1)
cv2.imshow('number_cnts', cnts)
cv2.imwrite('number_cnts.png', cnts)
m = cv2.moments(cnts[0])
cx = int(m["m10"] / m["m00"])
cy = int(m["m01"] / m["m00"])
cv2.circle(im, (cx, cy), 1, (0, 0, 255), 3)
cv2.imshow('center_of_mass', im)
cv2.waitKey(0)
cv2.imwrite('center_of_mass.png', cnts)
这是(错误的…)结果:
为什么重心被画在图像的左侧而不是(或多或少)中心
对此有什么解决办法吗?您可以尝试取上面提到的等高线点的平均值
这适用于这种情况,因为您的形状相当圆,因此轮廓点分布非常均匀。例如,如果你有一个“D”,在“D”的左边没有轮廓点,所以重心会有很大的偏差。
imgray = cv2.cvtColor(image, cv2.COLOR_BGR2GRAY)
ret, thresh = cv2.threshold(imgray, 127, 255, 0, cv2.THRESH_BINARY_INV | cv2.THRESH_OTSU)
_, contours, hierarchy = cv2.findContours(thresh, cv2.RETR_LIST, cv2.CHAIN_APPROX_NONE)
cnts = cv2.drawContours(image, contours[0], -1, (0, 255, 0), 1)
kpCnt = len(contours[0])
x = 0
y = 0
for kp in contours[0]:
x = x+kp[0][0]
y = y+kp[0][1]
cv2.circle(image, (np.uint8(np.ceil(x/kpCnt)), np.uint8(np.ceil(y/kpCnt))), 1, (0, 0, 255), 3)
cv2.namedWindow("Result", cv2.WINDOW_NORMAL)
cv2.imshow("Result", cnts)
cv2.waitKey(0)
cv2.destroyAllWindows()