Python：solvePnP（）没有足够的值来解压缩？

Question

我对OpenCV中名为cv2.solvePnP的函数有疑问。该功能用于获得棋盘的姿势估计。在以下代码之后我收到错误：

for fname in glob.glob('Images/Calibragem/img1*.jpg'):
    img = cv2.imread(fname)
    gray = cv2.cvtColor(img,cv2.COLOR_BGR2GRAY)
    ret, corners = cv2.findChessboardCorners(gray, (9,6), None)

    if ret==True:

        corners2=cv2.cornerSubPix(gray,corners,(11,11),(-1,-1), criteria)

        #finds the vectors of rotation and translation
        ret, rotationVectors, translationVectors, inliers = 
            cv2.solvePnP(objp, corners2, matrix, distortion)
        #projects the 3D points in the image

        imgpts,jac = cv2.projectPoints(axis,rotationVectors,translationVectors,matrix,distortion)

        imgAxis=drawAxis(img,corners2,imgpts)
        cv2.imshow('imgAxis', imgAxis)
        cv2.imwrite('imgAxis.png',imgAxis)

错误说：

  

ret，rotationVectors，translationVectors，inliers = cv2.solvePnP（objp，corners2，matrix，distortion）   ValueError：没有足够的值来解包（预期4，得到3）

Answer 1

来自opencv2 documentation：

 Python: cv2.solvePnP(objectPoints, imagePoints, cameraMatrix, distCoeffs[, rvec[, tvec[, useExtrinsicGuess[, flags]]]]) → retval, rvec, tvec¶

所以解压缩只有3个值 所以你应该能够解决：

ret, rotationVectors, translationVectors = 
            cv2.solvePnP(objp, corners2, matrix, distortion)

由于solvePnP（）仅返回retval，rvec和tvec。