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Generalised correlation for multi-feature correspondence
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DOI：10.1016/S0031-3203(01)00111-X.png)
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Computing correspondences between pairs of images is fundamental to all structures from motion algorithms, Correlation is a popular method to estimate similarity between patches of images. In the standard formulation, the correlation function uses only one feature such as the gray level values of a small neighbourhood. Research has shown that different features-such as colour, edge strength, corners, texture measures-work better under different conditions. We propose a framework of generalized correlation that can compute a real valued similarity measure using a feature vector whose components can be dissimilar. The framework can combine the effects of different image features, such as multi-spectral features, edges, corners, texture measures, etc., into a single similarity measure in a flexible manner. Additionally, it can combine results of different window sizes used for correlation with proper weighting for each. Relative importances of the features can be estimated from the image itself for accurate correspondence. In this paper, we present the framework of generalised correlation, provide a few examples demonstrating its power, as well as discuss the implementation issues. (C) 2002 Published by Elsevier Science Ltd on behalf of Pattern Recognition Society.
Keyword:
stereo vision
correspondence computation
correlation
feature integration
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