A Fast Dictionary Learning Method for Coupled Feature Space Learning
This work addresses the need for efficient feature learning in multi-modal or multi-quality signal processing, though it appears incremental as it builds on existing dictionary learning techniques.
The authors tackled the problem of learning correlated feature spaces for signals with multiple representations by proposing a computationally efficient coupled dictionary learning method, achieving significantly lower computational cost and ensuring pairwise correlations between dictionary atoms.
In this letter, we propose a novel computationally efficient coupled dictionary learning method that enforces pairwise correlation between the atoms of dictionaries learned to represent the underlying feature spaces of two different representations of the same signals, e.g., representations in different modalities or representations of the same signals measured with different qualities. The jointly learned correlated feature spaces represented by coupled dictionaries are used in sparse representation based classification, recognition and reconstruction tasks. The presented experimental results show that the proposed coupled dictionary learning method has a significantly lower computational cost. Moreover, the visual presentation of jointly learned dictionaries shows that the pairwise correlations between the corresponding atoms are ensured.