四.3D-2D：PnP问题求解 线性法

调用solvePnP函数 bool cv::solvePnP(objectPoints,imagePoints,cameraMatrix,distCoeffs, OutputArray r, OutputArray t, bool useExtrinsicGuess = false,int flags = SOLVEPNP_ITERATIVE ) 缺点：P3P只利用了3个点信息（后续提出EPNP、

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