Ab

Figure 2.7: Local binary pattern response. (a) Original image. (b) Local binary pattern output with parameters R = 3, P = 24.

0/1, 1/0 while we move over the neighborhood:

U(LBPpr) = \s(gr-1 - gc) - s(go - gc)| + ^ \s(gp - gc) - s(gp-1 - gc)|

Therefore,

LBPriu2 = j LBPiR if U(LBPpr) < 2 ' [ P + 1 otherwise.

Figure 2.7 shows an example of an IVUS image filtered using a uniform rotation invariant local binary pattern with values P = 24, R = 3. The feature extraction image displayed in the figure looks like a discrete response focussed on the structure shape and homogeneity.

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