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

1994

@article{KaC1994,
	vgclass =	{refpap},
	author =	{Greg Kay and Terry Caelli},
	title =	{Inverting an Illumination Model from Range and Intensity
	Maps},
	journal =	{Computer Vision, Graphics and Image Processing: Image Understanding},
	volume =	{59},
	number =	{2},
	pages =	{183--201},
	month =	{March},
	year =	{1994},
	abstract =	{We propose a solution to the problem of determining
	surface material properties from range and intensity data using a
	simplified version of the Torrance-Sparrow illumination model. The
	solution use the photometric stereo method and regularization to invert
	the model equations at each point on a surface. Assuming a convex
	surface, one range map, and four or more intensity maps obtained using
	point light sources, we classify the surface into nonhighlight regions,
	specular highlight regions, and rank-deficient regions. This
	classification allows the appropriate solution method to be applied to
	each region. In nonhighlighted regions we use linear least squares, in
	highlight regions, nonlinear separable least squares with
	regularization, and in rank-deficient regions, interpolation. The
	solution consists of the values of the three parameters of the
	illumination model at each point on the surface. We believe this
	technique to be a useful adjunct to recently reported noncontact
	modeling systems. These systems have been designed to build computer
	graphics models automatically from real objects by determining surface
	geometry, surface relief texture, and material properties. Our
	technique greatly enhances the modeling of material properties. The
	paper concludes with a number of examples of the method applied to
	synthetic and real images, and a discussion of possibilities for future
	systems.},
}