DEEP DICTIONARY LEARNING: SYNERGIZING RECONSTRUCTION AND CLASSIFICATION

Shahin Mahdizadehaghdam, Ashkan Panahi, Hamid Krim, Liyi Dai

Abstract: Deep dictionary learning seeks multiple dictionaries at different image scales to capture complementary coherent characteristics. We propose a method for learning a hierarchy of synthesis dictionaries with an image classification goal. The dictionaries and classification parameters are trained by a classification objective, and the sparse features are extracted by reducing a reconstruction loss in each layer. The reconstruction objectives in some sense regularize the classification problem and inject source signal information in the extracted features. The performance of the proposed hierarchical method increases by adding more layers, which consequently makes this model easier to tune and adapt. The validation of the proposed approach is based on its classification performance using four benchmark datasets and is compared to a CNN of similar size.