Texture Recognition under Varying Imaging Geometries

A model-based texture recognition system which
classifies image textures seen from different
distances and under different illumination directions
is presented in this book. The system works on the
basis of a surface model obtained by means of
4-source Colour Photometric Stereo (CPS), used to
generate 2D image textures as they would have
appeared if imaged under different imaging
geometries. The proposed recognition system combines
co-ocurrence matrices for feature extraction with a
Nearest Neighbour classifier. The use of the
co-occurrence matrices instead of filtering methods
for feature extraction allows us to utilise only
pixels for which valid information has been extracted
by CPS.
The validity of the method is demonstrated by
classifying texture images captured under different
imaging geometries than the reference images in the
database. Moreover, the process of recognition allows
one to guess the approximate direction of the
illumination used to capture the test image.

Autorentext

Xavier Lladó received the B.S. degree in Computer Science in1999, and the PhD in Computer Engineering in 2004. Currently, heis a lecturer at the University of Girona. His research interestsare in the field of image processing and computer vision,focusing on Colour and Texture analysis, Shape from Shading, andNon-rigid Structure from Motion.

Klappentext

A model-based texture recognition system whichclassifies image textures seen from differentdistances and under different illumination directionsis presented in this book. The system works on thebasis of a surface model obtained by means of4-source Colour Photometric Stereo (CPS), used togenerate 2D image textures as they would haveappeared if imaged under different imaginggeometries. The proposed recognition system combinesco-ocurrence matrices for feature extraction with aNearest Neighbour classifier. The use of theco-occurrence matrices instead of filtering methodsfor feature extraction allows us to utilise onlypixels for which valid information has been extractedby CPS.The validity of the method is demonstrated byclassifying texture images captured under differentimaging geometries than the reference images in thedatabase. Moreover, the process of recognition allowsone to guess the approximate direction of theillumination used to capture the test image.