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利用SVD求解3D-3D变换，需要U和V的行列式同号。换言之，旋转矩阵的行列式只能为1，不能为-1。
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利用SVD求解3D-3D变换，需要U和V的行列式同号。换言之，旋转矩阵的行列式只能为1，不能为-1。