Herman M. Gomes,  Robert B. Fisher. 

In this paper, we compare two distinct primal sketch feature extraction operators designed to process log-polar images: one based on neural network feature learning and the other based on mathematical models of the features. We tested both kinds of operator with a set of known, but previously untrained, synthetic features and, while varying their classification thresholds, measured the operator's false acceptance and false rejection errors. Results have shown that the model-based approach is more unstable and unreliable than the learning-based approach, which presented better results with respect to the number of correctly classified features.

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