Perception Of High-Pass Filtered Images

Eli Peli

doi:10.1117/12.976497

13 October 1987 Perception Of High-Pass Filtered Images

Eli Peli

Proceedings Volume 0845, Visual Communications and Image Processing II; (1987) https://doi.org/10.1117/12.976497
Event: Cambridge Symposium on Optics in Medicine and Visual Image Processing, 1987, San Diego, CA, United States

Abstract

Many visual illusions and Gestalt grouping phenomena may be explained by low-pass filtering of these images by the visual system. However, the perceptions of these images are maintained even if such images are high-pass filtered before display, removing the low-frequency information. Many such high-pass filtered images can be treated as a form of two-dimensional amplitude modulation (2-D AM) signals. The low-frequency figure information is coded in the modulation envelope, which disappears with the carrier if low-pass filtered. The envelope may be retrieved (demodulated), using one of many non-linear operations followed by a low-pass filter. Theory and image-processing simulations show that the compressive non-linearity of the visual system suffices to demodulate these images. This model accounts for various perceptual phenomena associated with filtered images and band-limited psychophysical stimuli.

Citation Download Citation

Eli Peli "Perception Of High-Pass Filtered Images", Proc. SPIE 0845, Visual Communications and Image Processing II, (13 October 1987); https://doi.org/10.1117/12.976497

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