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176 results on '"Mei, Shaohui"'

173. Optimizing Hopfield Neural Network for Spectral Mixture Unmixing on GPU Platform.

Author

Mei, Shaohui, He, Mingyi, and Shen, Zhiming

Abstract

The Hopfield neural network (HNN) has been demonstrated to be an effective tool for the spectral mixture unmixing of hyperspectral images. However, it is extremely time consuming for such per-pixel algorithm to be utilized in real-world applications. In this letter, the implementation of a multichannel structure of HNN (named as MHNN) on a graphics processing unit (GPU) platform is proposed. According to the unmixing procedure of MHNN, three levels of parallelism, including thread, block, and stream, are designed to explore the peak computing capacity of a GPU device. In addition, constant and texture memories are utilized to further improve its computational performance. Experiments on both synthetic and real hyperspectral images demonstrated that the proposed GPU-based implementation works on the peak computing ability of a GPU device and obtains several hundred times of acceleration versus the CPU-based implementation while its unmixing performance remains unchanged. [ABSTRACT FROM PUBLISHER]

Published
2014
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176. Learning spatial and spectral features via 2D-1D generative adversarial network for hyperspectral image super-resolution

Author

Jiang, Ruituo, Li, Xu, Mei, Shaohui, Yue, Shigang, Zhang, Lei, Jiang, Ruituo, Li, Xu, Mei, Shaohui, Yue, Shigang, and Zhang, Lei

Abstract

Three-dimensional (3D) convolutional networks have been proven to be able to explore spatial context and spectral information simultaneously for super-resolution (SR). However, such kind of network can’t be practically designed very ‘deep’ due to the long training time and GPU memory limitations involved in 3D convolution. Instead, in this paper, spatial context and spectral information in hyperspectral images (HSIs) are explored using Two-dimensional (2D) and Onedimenional (1D) convolution, separately. Therefore, a novel 2D-1D generative adversarial network architecture (2D-1DHSRGAN) is proposed for SR of HSIs. Specifically, the generator network consists of a spatial network and a spectral network, in which spatial network is trained with the least absolute deviations loss function to explore spatial context by 2D convolution and spectral network is trained with the spectral angle mapper (SAM) loss function to extract spectral information by 1D convolution. Experimental results over two real HSIs demonstrate that the proposed 2D-1D-HSRGAN clearly outperforms several state-of-the-art algorithms.

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