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Image correction is discussed for realizing both effective object recognition and realistic image-based rendering. Three image normalizations are compared in relation with the linear subspaces and eigenspaces, and we conclude that normalization by L1-norm, which normalizes the total sum of intensities, is the best for our purposes. Based on noise analysis in the normalized image space (NIS), an image correction algorithm is constructed, which is accomplished by iterative projections along with corrections of an image to an eigenspace in NIS. Experimental results show that the proposed method works well for natural images which include various kinds of noise shadows, reflections and occlusions. The proposed method provides a feasible solution to object recognition based on the illumination cone. The technique can also be extended to face detection of unknown persons and registration/recognition using eigenfaces.
eigenvalues and eigenfunctions
rendering (computer graphics)
Digital Object Identifier: 10.1109/ICPR.2002.1044831
Published with permission from the copyright holder. This is the institute's copy, as published in Pattern Recognition, 2002. Proceedings. 16th International Conference on, 11-15 Aug 2002, Vol. 1, Pages 648-651.
Copyright © 2002 IEEE. All rights reserved.