Python Raspberry pi OpenCV错误：（-215）ni==函数CollectionCalibrationData中的ni1

我在raspberry pi 3上运行python 3，并安装了opencv。我拍摄了棋盘上的10幅图像，它检测并显示所有10幅图像，但当它到达最后一行时，它抛出了一个错误。以下是我使用的图像：这是我的代码：

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:
    print('test')
    img = cv2.imread(fname)
    gray = cv2.cvtColor(img,cv2.COLOR_BGR2GRAY)

    # Find the chess board corners
    ret, corners = cv2.findChessboardCorners(gray, (6,9),None)

    # If found, add object points, image points (after refining them)
    if ret == True:
        print('test2')
        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, (6,9), corners2,ret)
        cv2.imshow('img',img)
        cv2.waitKey(500)
print('test3')
cv2.destroyAllWindows()
ret, mtx, dist, rvecs, tvecs = cv2.calibrateCamera(objpoints, imgpoints, gray.shape[::-1],None,None)

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该示例假设您有一个6x7棋盘图像，我认为您有一个6x9。 您必须为6x9校准图像准备objp变量，因此代码必须如下所示：objp=np.zeros（（6*9，3），np.float32）

代码：

谢谢@Rui Sebastiao.
我使用的是14 x 10，因此我更改了以下行，至少没有错误：）

objp = np.zeros((6*9,3), np.float32)

    objp = np.zeros((14*10, 3), np.float32)
    objp[:, :2] = np.mgrid[0:14, 0:10].T.reshape(-1, 2)