We present a focus-based method to recover the orientation
of a textured planar surface patch from a single image.
The method exploits the relationship between the orientation
of equifocal (i.e. uniformly-blurred) contours in
the image and the plane’s tilt and slant angles. Compared
to previous methods that determine planar orientation, we
make fewer assumptions about the texture and remove the
restriction that images must be acquired through a pinhole
aperture. Our method estimates slant and tilt of an image
patch in a single image, as compared to depth from defocus
methods that require two or more input images. Experiments
are performed using a large set of test images.
Michael S. Langer, Scott McCloskey