Paper Abstract and Keywords |
Presentation |
2015-03-17 13:25
Effects of downsampling on hyperparameter estimation for Markov random field model Hirotaka Sakamoto (Univ. Tokyo), Yoshinori Nakanishi-Ohno (Univ. Tokyo/JSPS), Masato Okada (Univ. Tokyo/RIKEN) MBE2014-174 NC2014-125 |
Abstract |
(in Japanese) |
(See Japanese page) |
(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) |
(in English) |
image data / downsampling / Markov random field model / hyperparameter estimation / diffusion coefficient / / / |
Reference Info. |
IEICE Tech. Rep., vol. 114, no. 515, NC2014-125, pp. 325-330, March 2015. |
Paper # |
NC2014-125 |
Date of Issue |
2015-03-09 (MBE, NC) |
ISSN |
Print edition: ISSN 0913-5685 Online edition: ISSN 2432-6380 |
Copyright and reproduction |
All rights are reserved and no part of this publication may be reproduced or transmitted in any form or by any means, electronic or mechanical, including photocopy, recording, or any information storage and retrieval system, without permission in writing from the publisher. Notwithstanding, instructors are permitted to photocopy isolated articles for noncommercial classroom use without fee. (License No.: 10GA0019/12GB0052/13GB0056/17GB0034/18GB0034) |
Download PDF |
MBE2014-174 NC2014-125 |
Conference Information |
Committee |
NC MBE |
Conference Date |
2015-03-16 - 2015-03-17 |
Place (in Japanese) |
(See Japanese page) |
Place (in English) |
Tamagawa University |
Topics (in Japanese) |
(See Japanese page) |
Topics (in English) |
ME, etc |
Paper Information |
Registration To |
NC |
Conference Code |
2015-03-NC-MBE |
Language |
Japanese |
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 |
Keyword(6) |
|
Keyword(7) |
|
Keyword(8) |
|
1st Author's Name |
Hirotaka Sakamoto |
1st Author's Affiliation |
The University of Tokyo (Univ. Tokyo) |
2nd Author's Name |
Yoshinori Nakanishi-Ohno |
2nd Author's Affiliation |
The University of Tokyo/Reserch Fellow of Japan Society for the Promotion of Science (Univ. Tokyo/JSPS) |
3rd Author's Name |
Masato Okada |
3rd Author's Affiliation |
The University of Tokyo/RIKEN (Univ. Tokyo/RIKEN) |
4th Author's Name |
|
4th Author's Affiliation |
() |
5th Author's Name |
|
5th Author's Affiliation |
() |
6th Author's Name |
|
6th Author's Affiliation |
() |
7th Author's Name |
|
7th Author's Affiliation |
() |
8th Author's Name |
|
8th Author's Affiliation |
() |
9th Author's Name |
|
9th Author's Affiliation |
() |
10th Author's Name |
|
10th Author's Affiliation |
() |
11th Author's Name |
|
11th Author's Affiliation |
() |
12th Author's Name |
|
12th Author's Affiliation |
() |
13th Author's Name |
|
13th Author's Affiliation |
() |
14th Author's Name |
|
14th Author's Affiliation |
() |
15th Author's Name |
|
15th Author's Affiliation |
() |
16th Author's Name |
|
16th Author's Affiliation |
() |
17th Author's Name |
|
17th Author's Affiliation |
() |
18th Author's Name |
|
18th Author's Affiliation |
() |
19th Author's Name |
|
19th Author's Affiliation |
() |
20th Author's Name |
|
20th Author's Affiliation |
() |
Speaker |
Author-1 |
Date Time |
2015-03-17 13:25:00 |
Presentation Time |
25 minutes |
Registration for |
NC |
Paper # |
MBE2014-174, NC2014-125 |
Volume (vol) |
vol.114 |
Number (no) |
no.514(MBE), no.515(NC) |
Page |
pp.325-330 |
#Pages |
6 |
Date of Issue |
2015-03-09 (MBE, NC) |
|