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. 2020 May 26;4(2):29. doi: 10.3390/vision4020029

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© 2020 by the authors.

Licensee MDPI, Basel, Switzerland. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC BY) license (http://creativecommons.org/licenses/by/4.0/).

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(A) Frequency response of the four filter types both as low-pass filters (left) and as high-pass filters (right). (B) Example stimuli for Experiment 2. Note the strong ringing artifacts for the Heaviside filter, which successively decrease for smoother filters (from left to right). In the Gaussian HSF image (top-right) spillover of LSF into the HSF are clearly visible, e.g., on the face and the arms of the cyclist. (C) Accuracy of scene categorization for Experiment 2. * p < 0.05; *** p < 0.001.