四.3D-2D：PnP問題求解 線性法

調用solvePnP函數 bool cv::solvePnP(objectPoints,imagePoints,cameraMatrix,distCoeffs, OutputArray r, OutputArray t, bool useExtrinsicGuess = false,int flags = SOLVEPNP_ITERATIVE ) 缺點：P3P只利用了3個點信息（後續提出EPNP、

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