用solvePnPRansac()分解出太多值-姿势估计 [英] 'Too many values to unpack' with solvePnPRansac() - Pose Estimation

问题描述

我正在尝试运行本教程中的代码-姿势估计，

I'm trying to run the code from this tutorial - Pose Estimation,

，调用solvePnPRansac函数后，出现以下错误:

and I get the following error, after calling solvePnPRansac function:

rvecs, tvecs, inliers = cv2.solvePnPRansac(objp, corners2, mtx, dist)

ValueError:太多值无法解包

ValueError: too many values to unpack

根据文档:

Python:cv2.solvePnPRansac(objectPoints，imagePoints，cameraMatrix，distCoeffs [，rvec [，tvec [，useExtrinsicGuess [，erationsCount [，reprojectionError [，minInliersCount [，inliers [，标志]]]]]]]]])]]]→] rvec，tvec，inliers

Python: cv2.solvePnPRansac(objectPoints, imagePoints, cameraMatrix, distCoeffs[, rvec[, tvec[, useExtrinsicGuess[, iterationsCount[, reprojectionError[, minInliersCount[, inliers[, flags]]]]]]]]) → rvec, tvec, inliers

有人处理这个问题吗?

(Python 2.7，OpenCV 3b)

(Python 2.7 , OpenCV 3b)

推荐答案

该异常表明返回了3个以上的值.不幸的是，OpenCV3更改了许多方法签名，但没有真正对其进行文档化.我检查了solvepnp.cpp，签名显示为:

The exception says that there are more than 3 values returned. OpenCV3 has changed a lot of method signatures, unfortunately without really documenting it. I inspected the solvepnp.cpp and the signature reads:

bool cv::solvePnPRansac(InputArray _opoints, InputArray _ipoints,
                    InputArray _cameraMatrix, InputArray _distCoeffs,
                    OutputArray _rvec, OutputArray _tvec, bool useExtrinsicGuess,
                    int iterationsCount, float reprojectionError, double confidence,
                    OutputArray _inliers, int flags)

这似乎表明没有任何变化.但是，在python中:

which seems to indicate that nothing has changed. However, in python:

solvePnPRansac(...)
solvePnPRansac(objectPoints, imagePoints, cameraMatrix, distCoeffs[, rvec[, tvec[, useExtrinsicGuess[, iterationsCount[, reprojectionError[, confidence[, inliers[, flags]]]]]]]]) 
-> retval, rvec, tvec, inliers

尝试一下可能会有所帮助:

So it might help to try out:

_, rvecs, tvecs, inliers  = cv2.solvePnPRansac(objp, corners2, mtx, dist)

或者如果您只想解压缩最后三个元素:

or in case you just want to unpack the last 3 elements:

rvecs, tvecs, inliers  = cv2.solvePnPRansac(objp, corners2, mtx, dist)[:-3]

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