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  Horizon estimation: perceptual and computational experiments

Herdtweck, C., & Wallraven, C. (2010). Horizon estimation: perceptual and computational experiments. In D. Guttierez, J. Kearney, M. Banks, & K. Mania (Eds.), 7th Symposium on Applied Perception in Graphics and Visualization (APGV 2010) (pp. 49-56). New York, NY, USA: ACM.

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Item Permalink: http://hdl.handle.net/11858/00-001M-0000-0013-BF3A-A Version Permalink: http://hdl.handle.net/21.11116/0000-0003-1D47-E
Genre: Conference Paper

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 Creators:
Herdtweck, C1, 2, 3, Author              
Wallraven, C, Author              
Affiliations:
1Department Human Perception, Cognition and Action, Max Planck Institute for Biological Cybernetics, Max Planck Society, ou_1497797              
2Max Planck Institute for Biological Cybernetics, Max Planck Society, Spemannstrasse 38, 72076 Tübingen, DE, ou_1497794              
3Project group: Cognitive Engineering, Max Planck Institute for Biological Cybernetics, Max Planck Society, Spemannstrasse 38, 72076 Tübingen, DE, ou_2528702              

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 Abstract: The human visual system is able to quickly and robustly infer a wealth of scene information -- the scene "gist" - already after 100 milliseconds of image presentation. Here, we investigated the ability to estimate the position of the horizon in briefly shown images. Being able to judge the horizon position quickly and accurately will help in inferring viewer orientation and scene structure in general and thus might be an important factor of scene gist. In the first, perceptual study, we investigated participants' horizon estimates after a 150 millisecond, masked presentation of typical outdoor scenes from different scene categories. All images were shown in upright, blurred, inverted, and cropped conditions to investigate the influence of different information types on the perceptual decision. We found that despite individual variations, horizon estimates were fairly consistent across participants and conformed well to annotated data. In addition, inversion resulted in significant differences in performance, whereas blurring did not yield any different results, highlighting the importance of global, low-frequency information for making judgments about horizon position. In the second, computational experiment, we then correlated the performance of several algorithms for horizon estimation with the human data -- algorithms ranged from simple estimations of bright-dark-transitions to more sophisticated frequency spectrum analyses motivated by previous computational modeling of scene classification results. Surprisingly, the best fits to human data were obtained with one very simple gradient method and the most complex, trained method. Overall, global frequency spectrum analysis provided the best fit to human estimates, which together with the perceptual data suggests that the human visual system might use similar mechanisms to quickly judge horizon position as part of the scene gist.

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 Dates: 2010-07
 Publication Status: Published in print
 Pages: -
 Publishing info: -
 Table of Contents: -
 Rev. Method: -
 Identifiers: DOI: 10.1145/1836248.1836257
BibTex Citekey: 6589
 Degree: -

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Title: 7th Symposium on Applied Perception in Graphics and Visualization (APGV 2010)
Place of Event: Los Angeles, CA, USA
Start-/End Date: 2010-07-23 - 2010-07-24

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Title: 7th Symposium on Applied Perception in Graphics and Visualization (APGV 2010)
Source Genre: Proceedings
 Creator(s):
Guttierez, D, Editor
Kearney, J, Editor
Banks, M, Editor
Mania, K, Editor
Affiliations:
-
Publ. Info: New York, NY, USA : ACM
Pages: - Volume / Issue: - Sequence Number: - Start / End Page: 49 - 56 Identifier: ISBN: 978-1-4503-0248-7