LM201
SIFT在目前并不常用,它主要是用作一个参考基准来衡量新算法的质量。因为需要降低计算复杂度,所以最终导致要开发一套更容易实现的新型特征提取算法。 二代算法 SpeededUpRobustFeatures(SURF)是最早考虑实现效率的特征检测器之一。它使用不同矩形尺寸中的一系列加法和减法取代了SIFT中浩繁的运算。而且,这些运算容易矢量化,需要的内存较少。 接下来,HistogramsofOrientedGradients(HOG)这种在汽车行业中常用的热门行人检测算法可以变动,采用不同的尺度来检测不同大小的对象,并使用块之间的重叠量来提高检测质量,而不增加计算量。它可以利用并行存储器访问,而不像传统存储系统那样每次只处理一个查找表,因此根据内存的并行程度加快了查找速度。 然后,OrientedFASTandRotatedBRIEF(ORB)这种用来替代SIFT的高效算法将使用二进制描述符来提取特征。ORB将方向的增加与FAST角点检测器相结合,并旋转BRIEF描述符,使其与角方向对齐。二进制描述符与FAST和HarrisCorner等轻量级函数相结合产生了一个计算效率非常高而且相当准确的描述图。 SURF和ORB等计算效率超高的算法为CNN之类的功能更强大的框架提供了实现的可能 LM201
LM201
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