| Presentation | 2015-03-17 Effects of downsampling on hyperparameter estimation for Markov random field model Hirotaka SAKAMOTO, Yoshinori NAKANISHI-OHNO, Masato OKADA, |
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| Abstract(in Japanese) | (See Japanese page) |
| Abstract(in English) | We investigate effects which downsampling has on latent-variable estimation from image data. Downsampling is essential for imaging techniques since spatially continuous objects are recorded as discrete data. In this study, first, we formulate a generative model and a cognitive one of imaging processes with downsampling by Markov random field models. Next, by applying Bayes' theorem to the cognitive model, we explain a method of estimating hyperparameters in the model. Then, we conduct numerical simulations to examine Bayesian posterior distribution and indicate that downsampling causes characteristic biases. Finally, we discuss the biases focusing on the relation between the generative and cognitive models. |
| Keyword(in Japanese) | (See Japanese page) |
| Keyword(in English) | image data / downsampling / Markov random field model / hyperparameter estimation / diffusion coefficient |
| Paper # | MBE2014-174,NC2014-125 |
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| Conference Information | |
| Committee | NC |
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| Conference Date | 2015/3/9(1days) |
| Place (in Japanese) | (See Japanese page) |
| Place (in English) | |
| Topics (in Japanese) | (See Japanese page) |
| Topics (in English) | |
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| Paper Information | |
| Registration To | Neurocomputing (NC) |
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| Language | JPN |
| Title (in Japanese) | (See Japanese page) |
| Sub Title (in Japanese) | (See Japanese page) |
| Title (in English) | Effects of downsampling on hyperparameter estimation for Markov random field model |
| Sub Title (in English) | |
| Keyword(1) | image data |
| Keyword(2) | downsampling |
| Keyword(3) | Markov random field model |
| Keyword(4) | hyperparameter estimation |
| Keyword(5) | diffusion coefficient |
| 1st Author's Name | Hirotaka SAKAMOTO |
| 1st Author's Affiliation | Graduate School of Frontier Sciences, The University of Tokyo() |
| 2nd Author's Name | Yoshinori NAKANISHI-OHNO |
| 2nd Author's Affiliation | Graduate School of Frontier Sciences, The University of Tokyo:Japan Society for the Promotion of Science |
| 3rd Author's Name | Masato OKADA |
| 3rd Author's Affiliation | Graduate School of Frontier Sciences, The University of Tokyo:RIKEN Brain Science Institute |
| Date | 2015-03-17 |
| Paper # | MBE2014-174,NC2014-125 |
| Volume (vol) | vol.114 |
| Number (no) | 515 |
| Page | pp.pp.- |
| #Pages | 6 |
| Date of Issue | |