Accession Number : ADA266960


Title :   Segmenting Textured 3D Surfaces Using the Space/Frequency Representation


Descriptive Note : Technical rept.,


Corporate Author : CARNEGIE-MELLON UNIV PITTSBURGH PA ROBOTICS INST


Personal Author(s) : Krumm, John ; Shafer, Steven A


Full Text : https://apps.dtic.mil/dtic/tr/fulltext/u2/a266960.pdf


Report Date : Apr 1993


Pagination or Media Count : 32


Abstract : Segmenting 3D textured surfaces is critical for general image understanding. Unfortunately, current efforts at automatically understanding image texture are based on assumptions that make this goal impossible. Texture segmentation research assumes that the textures are flat and viewed from the front, while shape-from-texture work assumes that the textures have already been segmented. This deadlock means that none of these algorithms can be successfully applied to images of 3D textured surfaces. We have developed an algorithm that can segment an image containing nonfrontally viewed, planar, periodic textures. We use the spectrogram to compute local surface normals from many different regions of the image. This algorithm does not require unreliable image feature detection. Based on these surface normals, we compute a 'frontalized' version of the local power spectrum which shows what the region's power spectrum would look like if viewed from the front. If neighboring regions have similar frontalized power spectra, they are merged. To our knowledge, this is the first program that can segment 3D textured surfaces by explicitly accounting for shape effects.


Descriptors :   *PATTERN RECOGNITION , *COMPUTER VISION , ALGORITHMS , DETECTION , SHAPE , POWER SPECTRA , TEXTURE , SEGMENTED , SURFACES , THREE DIMENSIONAL , SPECTRA , COORDINATES , IMAGES


Subject Categories : Cybernetics


Distribution Statement : APPROVED FOR PUBLIC RELEASE