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. Author manuscript; available in PMC: 2009 Jul 7.
Published in final edited form as: Vision Res. 2007 Jan 16;47(4):437–451. doi: 10.1016/j.visres.2006.11.012

Fig. 1.

Fig. 1

Samples of trigrams filtered by the seven raised-cosine log filters (center frequency ranging from 0.88 to 7.07 c/letter, in half-octave steps), as well as the unfiltered versions are shown for the three letter separations (nominal separations = 0.8, 1 and 1.25× x-height). All letters share the same relative contrast of 1 (maximum contrast after filtering without rescaling).