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Comparison of the filters of the final stage learned on our dataset. Red color are positive values, blue color are negative values, and white color is zero. (a) PCANet filters, (b) SpPCANet filters, (c) GS-PCANet filters. Also shown are the covariance matrix of the components. (d) PCANet covariance matrix, (e) SpPCANet covariance matrix, (f) GS-PCANet covariance matrix.
