Figure 4From: Evaluation of noise robustness for local binary pattern descriptors in texture classification Examples of Gabor filters used. The real part of the Gabor filter kernels of one specific orientation (Θ = π/7) and one Gaussian envelope (γ = 4,η = 4) are shown. (a) Highest central frequency computed to F M ≃0.53. (b–d) The three following lower frequencies with frequency ratio equal to 2 .Back to article page