After above processing, the descriptors are insensitive to the affine transform, rotation, noise and so on. They can hold the local features well, such as corners.

经该方法处理得到的描述子对仿射、旋转、噪声等的抗干扰能力得到提升，对形状的局部特性描述能力更强。

youdao

Actually, the view of vectors we take nowadays is that vectors are associated with a pair of numbers which, on the rotation of axes, transform like this.

实际上,今天我们讲矢量所用的观点是,矢量是和一组坐标值相对应的,在坐标轴旋转的过程中像这样变换

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