Recognition of Positive and Negative Bandpass-Filtered Images

1 October 1986

journal article
Published by SAGE Publications in Perception

Vol. 15 (5) , 595-602
https://doi.org/10.1068/p150595

Abstract

A study is reported in which the significance for vision of low- and high-spatial-frequency components of photographic positive and negative images was investigated by measuring recognition of bandpass-filtered photographs of faces. The results show that a 1.5 octave bandpass-filtered image contains sufficient visual information for good recognition performance, provided the filter is centred close to 20 cycles facewidth⁻¹. At low spatial frequencies negatives are more difficult to recognize than positives, but at high spatial frequencies there is no difference in recognition, implying that it is the low-frequency components of negatives which present difficulties for the visual system.

Keywords

BANDPASS FILTER

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