Camera calibration code - OpenCV Error: Assertion failed

Question

我正在尝试执行此代码以进行相机校准。此代码正在检测角点，但在该错误出现之后。

OpenCV Error: Assertion failed (nimages > 0) in unknown function, file ......\modules\calib3d\src\calibration.cpp, line 3415 Traceback (most recent call last): File "C:/Users/uidn1759/PycharmProjects/Camera Calibration/calib.py", line 25, in ret, mtx, dist, rvecs, tvecs = cv2.calibrateCamera(objpoints, imgpoints, gray.shape[::-1],None,None) cv2.error: ......\modules\calib3d\src\calibration.cpp:3415: error: (-215) nimages > 0

我找不到问题出在哪里，如果有人能解释一下，那对我会有帮助。谢谢- 这是代码-

import numpy as np
import cv2
import glob
criteria = (cv2.TERM_CRITERIA_EPS + cv2.TERM_CRITERIA_MAX_ITER, 30, 0.001)
objp = np.zeros((6*7,3), np.float32)
objp[:,:2] = np.mgrid[0:7,0:6].T.reshape(-1,2)
objpoints = []
imgpoints = []
images = glob.glob('/usr/local/share/OpenCV/samples/cpp/chess*.jpg')
img = cv2.imread("2.jpg")
gray = cv2.cvtColor(img, cv2.COLOR_BGR2GRAY)

ret = False
ret, corners = cv2.findChessboardCorners(gray, (7,6))
if ret == True:
    cv2.cornerSubPix(gray, corners, (11,11), (-1,-1), criteria)
    imgpoints.append(corners)
    # Draw and display the corners
    cv2.drawChessboardCorners(img, (7,6), corners, ret)
    cv2.imshow('img',img)
    cv2.imwrite('Corners_detected.jpg', img, None)
    cv2.waitKey(500)
cv2.destroyAllWindows()

ret, mtx, dist, rvecs, tvecs = cv2.calibrateCamera(objpoints, imgpoints, 
gray.shape[::-1],None,None)

Answer 1

在你的代码中你有：

objpoints = []

但你从来没有向它附加任何东西。您缺少：

objpoints .append(objp )

行后

imgpoints.append(corners)

还有一点，你应该在进行校准之前检查它们是否有点，例如：

if len(objpoints) == len(imgpoints) and len(objpoints) > 0:
    ret, mtx, dist, rvecs, tvecs = cv2.calibrateCamera(objpoints, imgpoints, gray.shape[::-1],None,None)
else:
    print("not enough points to calibrate")

Camera calibration code - OpenCV Error: Assertion failed

Camera calibration code - OpenCV Error: Assertion failed

python

opencv

camera-calibration