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想将摄像头中的四边形透视变换为俯视图,但mv的库里没有找到对四个点围成的区域(不为矩形)做处理,也没有找到透视变换的转换矩阵等类似的函数。我已只转换前的四个点的坐标和转换后的四个点的坐标,如何才能实现透视变换,求大佬指导