Weighted Random Forest using Gaze Distributions Measured from Observers for Gender Classification

Sayaka Yamaguchi, Masashi Nishiyama, Yoshio Iwai

2019

Abstract

We propose a method to improve gender classification from pedestrian images using a random forest weighted by a gaze distribution. When training samples contain a bias in the background surrounding pedestrians, a random forest classifier may incorrectly include the background attributes as discriminative features, thereby degrading the performance of gender classification on test samples. To solve the problem, we use a gaze distribution map measured from observers completing a gender classification task for pedestrian images. Our method uses the gaze distribution to assign weights when generating a random forest. Each decision tree of the random forest then extracts discriminative features from the regions corresponding to the predominant gaze locations. We investigated the effectiveness of our weighted random forest using a gaze distribution by comparing the following alternatives: assigning weights for feature selection, assigning weights for feature values, and assigning weights for information gains. We compare the gender classification results of our method with those of existing random forest methods. Experimental results show our random forest using information gains weighted according to the gaze distribution significantly improved the accuracy of gender classification on a publicly available dataset.

Paper Citation

in Harvard Style

Yamaguchi S., Nishiyama M. and Iwai Y. (2019). Weighted Random Forest using Gaze Distributions Measured from Observers for Gender Classification. In Proceedings of the 14th International Joint Conference on Computer Vision, Imaging and Computer Graphics Theory and Applications (VISIGRAPP 2019) - Volume 5: VISAPP; ISBN 978-989-758-354-4, SciTePress, pages 273-280. DOI: 10.5220/0007343002730280

in Bibtex Style

@conference{visapp19,
author={Sayaka Yamaguchi and Masashi Nishiyama and Yoshio Iwai},
title={Weighted Random Forest using Gaze Distributions Measured from Observers for Gender Classification},
booktitle={Proceedings of the 14th International Joint Conference on Computer Vision, Imaging and Computer Graphics Theory and Applications (VISIGRAPP 2019) - Volume 5: VISAPP},
year={2019},
pages={273-280},
publisher={SciTePress},
organization={INSTICC},
doi={10.5220/0007343002730280},
isbn={978-989-758-354-4},
}

in EndNote Style

TY - CONF

JO - Proceedings of the 14th International Joint Conference on Computer Vision, Imaging and Computer Graphics Theory and Applications (VISIGRAPP 2019) - Volume 5: VISAPP
TI - Weighted Random Forest using Gaze Distributions Measured from Observers for Gender Classification
SN - 978-989-758-354-4
AU - Yamaguchi S.
AU - Nishiyama M.
AU - Iwai Y.
PY - 2019
SP - 273
EP - 280
DO - 10.5220/0007343002730280
PB - SciTePress