Harris算法原理：

角点：最直观的印象就是在水平、竖直两个方向上变化均较大的点，即Ix、Iy都较大

边缘：仅在水平、或者仅在竖直方向有较大的变化量，即Ix和Iy只有其一较大

平坦地区：在水平、竖直方向的变化量均较小，即Ix、Iy都较小-Harris algorithms for : Corner : The most visual impression is the standard, two vertical direction changes are larger points, or Ix, Iy are more at risk : the only level or only in the vertical direction of a larger variation, and that Ix Iy only one of a larger flat area : the level Vertical changes in the direction of both the smaller, Ix, Iy smaller