| Complex-valued multistate associative memory with nonlinear multilevel functions for gray-level image reconstruction. | |
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MedLine Citation:
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PMID: 19643705 Owner: NLM Status: MEDLINE |
Abstract/OtherAbstract:
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A widely used complex-valued activation function for complex-valued multistate Hopfield networks is revealed to be essentially based on a multilevel step function. By replacing the multilevel step function with other multilevel characteristics, we present two alternative complex-valued activation functions. One is based on a multilevel sigmoid function, while the other on a characteristic of a multistate bifurcating neuron. Numerical experiments show that both modifications to the complex-valued activation function bring about improvements in network performance for a multistate associative memory. The advantage of the proposed networks over the complex-valued Hopfield networks with the multilevel step function is more outstanding when a complex-valued neuron represents a larger number of multivalued states. Further, the performance of the proposed networks in reconstructing noisy 256 gray-level images is demonstrated in comparison with other recent associative memories to clarify their advantages and disadvantages. |
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Authors:
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Gouhei Tanaka; Kazuyuki Aihara |
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Publication Detail:
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Type: Journal Article; Research Support, Non-U.S. Gov't Date: 2009-07-28 |
Journal Detail:
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Title: IEEE transactions on neural networks / a publication of the IEEE Neural Networks Council Volume: 20 ISSN: 1941-0093 ISO Abbreviation: - Publication Date: 2009 Sep |
Date Detail:
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Created Date: 2009-09-03 Completed Date: 2009-11-04 Revised Date: - |
Medline Journal Info:
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Nlm Unique ID: 101211035 Medline TA: IEEE Trans Neural Netw Country: United States |
Other Details:
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Languages: eng Pagination: 1463-73 Citation Subset: IM |
Affiliation:
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Institute of Industrial Science, University of Tokyo, Tokyo 153-8505, Japan. gouhei@sat.t.u-tokyo.ac.jp |
Export Citation:
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| MeSH Terms | |
Descriptor/Qualifier:
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Algorithms Association Learning* / physiology Color Computer Simulation Humans Image Processing, Computer-Assisted / methods* Memory* / physiology Mental Recall / physiology Neural Networks (Computer)* Neurons / physiology Nonlinear Dynamics Normal Distribution Periodicity Probability |
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