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特征点: 6 用agast方法检测特征点: 7 brisk方法: imagekeypoints[img![edgedetect[img] // imagelines[#, 0.28, 0.06] &](http://exp-picture.cdn.bcebos.com/ccc83ec5260f88356b43016dce0788013970861c.jpg?x-bce-process=image/resize,m_fill,w_92,h_69)
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