最近比较火的研究热点非下采样轮廓波变换代码，可以提取轮廓，而且对光照撸棒性较好，还可用于光照不变量提取-Recent comparison of fire hotspot nonsubsampled Contourlet Transform code, you can extract the contour line and stick to light and good resistance, it can also be used to extract light invariants