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PHD Thesis - Institute for Computer Graphics and Vision - Graz ...

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6.1. Wide-baseline region matching 94<br />

k=0<br />

k=1<br />

k=n<br />

Figure 6.1: Iterative registration procedure. At k = 0 the patches are aligned by LAF normalization<br />

only. Blue crosses denote the same location in both patches. The red cross indicates the<br />

position with the highest correlation value <strong>for</strong> the point location marked in the right patch. The<br />

dashed square illustrates the correlation window. The shifted point location (red) <strong>and</strong> the original<br />

point location (blue) are used to estimate a homography. The illustration shows only one<br />

point pair, <strong>for</strong> homography estimation additional point correspondences are established (>= 4).<br />

The left patch is then resampled using the homography. After that we are arrived at k=1 <strong>and</strong><br />

the procedure is repeated. Iteratively new homographies are estimated <strong>and</strong> applied to the left<br />

patch until the patches are registered (see k=n). Usually this is achieved in a few number of<br />

iterations. One may note that a part of the correlation window at k=1 is outside the defined<br />

image area. In the illustration the correlation window is drawn enlarged <strong>for</strong> easy reading. In<br />

the implementation one of course has to choose an appropriate window size to avoid problems<br />

on the borders.

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