cv2.cornerSubPix()函数返回无值。
我正在关注官方opencv教程。现在我正在进行相机校准主题。
以下是我的代码: -
import numpy as np
import cv2
import glob
# termination criteria
criteria = (cv2.TERM_CRITERIA_EPS + cv2.TERM_CRITERIA_MAX_ITER, 30, 0.001)
# prepare object points, like (0,0,0), (1,0,0), (2,0,0) ....,(6,5,0)
objp = np.zeros((6*7,3), np.float32)
objp[:,:2] = np.mgrid[0:7,0:6].T.reshape(-1,2)
# Arrays to store object points and image points from all the images.
objpoints = [] # 3d point in real world space
imgpoints = [] # 2d points in image plane.
images = glob.glob('*.jpg')
for fname in images:
img = cv2.imread(fname)
gray = cv2.cvtColor(img,cv2.COLOR_BGR2GRAY)
# Find the chess board corners
ret, corners = cv2.findChessboardCorners(gray, (7,6),None)
# If found, add object points, image points (after refining them)
if ret == True:
objpoints.append(objp)
corners2 = cv2.cornerSubPix(gray,corners,(11,11),(-1,-1),criteria)
imgpoints.append(corners2)
# Draw and display the corners
img = cv2.drawChessboardCorners(img, (7,6), corners2,ret)
cv2.imshow('img',img)
cv2.waitKey(500)
cv2.destroyAllWindows()
corner2在以下行中的值为None:
corners2 = cv2.cornerSubPix(gray,corners,(11,11),(-1,-1),criteria)
由于此行,cv2.imshow()也显示错误。
灰色,角落和标准都有一些价值。
答案 0 :(得分:2)
我遇到了同样的问题,结果是示例教程代码和我正在运行的版本之间的版本问题由PythonXY安装。
如果你的问题是corner2和img值都填充了None,那么这是因为你使用的OpenCV版本意味着使用这些命令更新输入而不是重新定义输入。
修复很简单,从以下两行更改:
corners2 = cv2.cornerSubPix(gray,corners,(11,11),(-1,-1),criteria)
img = cv2.drawChessboardCorners(img, (7,6), corners2,ret)`
为:
cv2.cornerSubPix(gray,corners,(11,11),(-1,-1),criteria)
cv2.drawChessboardCorners(img, (7,6), corners ,ret)