Ann-sophie Lehmann, Sylvia C. Pont, Jan-mark Geusebroek
We investigated tree textures starting from art historical sources describing the complicated appearance of trees, proceeding with an empirical survey using computer vision techniques, concluding...
21 2D texture mapping: real-time perceptual surface roughening (2008)
Sylvia C. Pont, Pradeep Sen, Pat Hanrahan
Figure 1: Cylinders with an orthogonally-projected plaster texture. In the first cylinder the texture is only warped, while in the second we have added diffuse shading as is conventionally done for...
Bidirectional texture contrast function (2005)
Sylvia C. Pont, Jan J. Koenderink
Abstract. We consider image texture due to the illumination of 3D surface corrugations on globally smooth curved surfaces. The same surface corrugations give rise to different image textures...
Irradiation orientation from obliquely viewed texture (2005)
Sylvia C. Pont, Jan J. Koenderink
Abstract. We studied image texture due to the shading of corrugated (3D textured) surfaces, which are Lambertian on the micro scale. Our theory applies to physically canonical cases of isotropic...
Bidirectional texture contrast function (2005)
Sylvia C. Pont, Jan J. Koenderink
Three dimensional surface corrugations on globally smooth sur-faces give rise to brightness modulations of global shading patterns. We study systematic variations of such 3D image texture as a...
Light direction from shad(ow)ed random Gaussian surfaces (2004)
Jan J Koenderink, Sylvia C Pont
Three human observers estimated the illumination direction for samples of random Gaussian surfaces illuminated by a collimated beam from random directions. These stimuli appear as `texture' due...
Irradiation direction from texture (2003)
Jan J. Koenderink, Sylvia C. Pont
We present a theory of image texture due to the shading of corrugated (3D textured) surfaces, Lambertian on the micro scale, in the domain of geomet-rical optics. Derivation applies to isotropic...
The influence of stimulus tilt on haptic curvature matching and (1998)
Sylvia C Pont, Jan J Koenderink
discrimination by dynamic touch
Bidirectional reflection distribution function expressed in terms of surface scattering modes (1996)
Sylvia C. Pont, Jan J. Koenderink
We derive the bidirectional reflectance distribution function for a class of opaque surfaces that are rough on a macroscale and smooth on a microscale. We model this type of surface as a distribution...