Shape from texture for smooth curved surfaces
in perspective projection
Jonas Gårding
J. of Mathematical Imaging and Vision, vol. 2, pp. 329--352,
Dec. 1992.
Abstract
Projective distortion of surface texture observed in a perspective
image can provide direct information about the shape of the underlying
surface. Previous theories have generally concerned planar surfaces;
in this paper we present a systematic analysis of first- and
second-order texture distortion cues for the case of a smooth curved
surface. In particular, we analyze several kinds of texture gradients
and relate them to snadace orienCVAP/tation and surface curvature. The
local estimates obtained from these cues can be integrated to obtain a
global surface shape, and we show that the two surfaces resulting from the
well-known tilt ambiguity in the local foreshortening cue typically
have qualitatively different shapes. As an example of a
practical application of the analysis, a shape
from texture algorithm based on local orientation-selective filtering
is described, and some experimental results are shown.
Full paper:
(PostScript 523k)
Jonas Gårding
<jonasg@bion.kth.se>