Refereed full papers (journals, book chapters, international conferences)

1978

@article{CPH1978,
	vgclass =	{refpap},
	author =	{T.M. Caelli and G.A.N. Preston and E.R. Howell},
	title =	{Implications of Spatial Summation Models for Processes of
	Contour Perception: A Geometric Perspective},
	journal =	{Vision Research},
	volume =	{18},
	pages =	{723--734},
	year =	{1978},
	abstract =	{Current models of how the visual system extracts contours
	from an image are based on its ability to encode relative position,
	element interactions and some form of spatial summation. The
	interactive process is usually interpreted as a weighting function
	inversely proportional to interelement distances. In this paper two
	particular weighting functions were experimentally compared - an
	exponential decay process (EDP) and the sinc function. Results
	indicated that the EDP decay parameter predicted local contour
	extraction better than the sinc function. The problem of contour
	extraction is phrased in terms of how the visual system extracts
	tangent vectors. curvature vectors and invariant vector fields from the
	stimulus. However it is contended that the underlying processes for
	these geometric operators reside in the cortical network dynamics that
	include summation. Results support this process and some considerations
	are given to the neurophysiological bases for these general functions
	which not only result in contour extraction but also produce
	orientation tuning curves and illusions.},
}