相机校准代码-OpenCV错误:断言失败 [英] Camera calibration code - OpenCV Error: Assertion failed

问题描述

我正在尝试执行此代码进行相机校准.这段代码正在检测拐角，但是在出现该错误之后.

I'm trying to execute this code for camera calibration. This code is detecting corners but after that error is coming.

OpenCV错误:未知函数，文件中的断言失败(nimages> 0)...... \ modules \ calib3d \ src \ calibration.cpp，第3415行追溯(最近通话最近):文件"C:/Users/uidn1759/PycharmProjects/Camera Calibration/calib.py"，行25英寸ret，mtx，dist，rvecs，tvecs = cv2.calibrateCamera(objpoints，imgpoints，gray.shape [::-1]，None，None)cv2.error:...... \ modules \ calib3d \ src \ calibration.cpp:3415:错误:(-215)nimages> 0

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

如果有人可以解释，我无法找到问题出在哪里，这将对我有所帮助.谢谢-这是代码-

I'm not able to find where is the problem, if someone can explain, that would be helpful for me. Thanks- Here is the code -

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)

推荐答案

在您的代码中，您具有:

In your code you have:

objpoints = []

，但是您从不添加任何内容.您不见了:

but you never append anything to it. You are missing:

objpoints .append(objp )

行后

imgpoints.append(corners)

还有一件事情，您应该在进行校准之前检查它们是否有点，例如:

One extra thing, you should check if they have points before doing calibration like:

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")

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