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. Author manuscript; available in PMC: 2013 Jun 26.
Published in final edited form as: Neural Comput. 2013 Jan 22;25(4):922–939. doi: 10.1162/NECO_a_00418

Figure 15.

Figure 15

Two examples of 230 × 230 patches from the van Hateren database and their convolution transformation by a Gabor and a double-Gabor filter with similar orientation prefereances. The 21 × 21 Gabor and double-Gabor filters (scaled up by a factor of three here) are shown in the middle and the bottom rows, respectively. Their corresponding transformed images were obtained by squaring each pixel after the convolution transformation of the images on the top with the filters shown. The convoluted images are 210 × 210 due to edges. The squaring better illustrates the edge and texture energy.