imhist分析灰度图阈值分界点

bwlabel分析连通区域

SIFT
Scale Invariant：尺度不变性

DoG: Difference of Gaussian, calculated by multiple Laplace of Gaussian. 计算高斯核函数差

Laplacian Scale Space, depiction of high contrast value.如何生成？

Rotation Invariant：旋转不变性

Compute Image Gradient 计算图像梯度

descriptor: histogram of gradient orientation

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