for a fixed p. An affine transformation yields: A(L(x, y)) = L(ax+by+c, dx+ey+ f) = sp(ax+by+c). = get sp(ax : Sampled at y sp(ax + t). Thus, the problem of finding an affine transformation of the two-dimensional pattern L has been reduced to finding a translation t of the one- dimensional pattern 5 The Landmark Recognition and w = 50. The length of and w = 45. each scanline 400. The top two patterns are locally

doi:10.1201/9781439864135-55

Chapter

for a fixed p. An affine transformation yields: A(L(x, y)) = L(ax+by+c, dx+ey+ f) = sp(ax+by+c). = get sp(ax

Chapter

ABSTRACT

An experimental study analyzing the shape of my(x ) for a wide range of parameters has revealed a simple but effective test for “sharpness” : Check that a peak at half its height is no wider than a fixed threshold, which only depends on the window size w. That is, given a local maximum v = my(xm) greater than a threshold Cmim test whether my(xm ± δχ) < v/2, where δχ is approximately w/10.