Sparse representation over discriminative dictionary for stereo matching

We propose a novel data-driven matching cost for dense correspondence based on sparse theory. The ability of sparse coding to selectively express the sources of influence on stereo images allows us to learn a discriminative dictionary. The dictionary learning process is incorporated with discriminative learning and weighted sparse coding to enhance the discrimination of sparse coefficients and weaken the influence of radiometric changes. Then, the sparse representations over the learned discriminative dictionary are utilized to measure the dissimilarity between image patches. Semi-global cost aggregation and postprocessings are finally enforced to further improve the matching accuracy. Extensive experimental comparisons demonstrate that: the proposed matching cost outperforms traditional matching costs, the discriminative dictionary learning model is more suitable than previous dictionary learning models for stereo matching, and the proposed stereo method ranks the third place on the Middlebury benchmark v3 in quarter resolution up to the submitting, and achieves the best accuracy on 30 classic stereo images. (C) 2017 Elsevier Ltd. All rights reserved.