Deep Sparse Band Selection for Hyperspectral Face Recognition
This work addresses the challenge of improving face recognition accuracy in hyperspectral imaging by automating band selection, though it appears incremental as it builds on existing CNN and sparsity techniques.
The authors tackled the problem of selecting optimal spectral bands for hyperspectral face recognition by proposing a CNN framework with structural sparsity learning, which automatically selects bands and outperforms state-of-the-art methods on public datasets.
Hyperspectral imaging systems collect and process information from specific wavelengths across the electromagnetic spectrum. The fusion of multi-spectral bands in the visible spectrum has been exploited to improve face recognition performance over all the conventional broad band face images. In this book chapter, we propose a new Convolutional Neural Network (CNN) framework which adopts a structural sparsity learning technique to select the optimal spectral bands to obtain the best face recognition performance over all of the spectral bands. Specifically, in this method, images from all bands are fed to a CNN, and the convolutional filters in the first layer of the CNN are then regularized by employing a group Lasso algorithm to zero out the redundant bands during the training of the network. Contrary to other methods which usually select the useful bands manually or in a greedy fashion, our method selects the optimal spectral bands automatically to achieve the best face recognition performance over all spectral bands. Moreover, experimental results demonstrate that our method outperforms state of the art band selection methods for face recognition on several publicly-available hyperspectral face image datasets.