This work discusses some aspects about feature detectors and spatial frequency analysis models in five sections. The first section describes briefly historical aspects and the basic rationale idea of each model. The second section shows the neurophysiological and psychophysical evidences about spatial frequency selectivity. The third, the fourth and the fifth sections show controversial aspects about these models: spatial frequency versus feature detectors, global versus local filtering and nonlinear versus linear spatial processing, respectively. One of the goals of this paper is to discuss important aspects about perception and visual processing of form.
Spatial vision; visual perception of forms; spatial processing; feature detectors; spatial frequency