Learning ordered pooling weights in image classification

doi:10.1016/j.neucom.2020.06.028

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Learning ordered pooling weights in image classification

2020-10-01

Miguel Pagola

Barrenechea, Edurne

Humberto Bustince

DOI：10.1016/j.neucom.2020.06.028

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Abstract

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Spatial pooling is an important step in computer vision systems like Convolutional Neural Networks or the Bag-of-Words method. The spatial pooling purpose is to combine neighbouring descriptors to obtain a single descriptor for a given region (local or global). The resultant combined vector must be as discriminant as possible, in other words, must contain relevant information, while removing irrelevant and confusing details. Maximum and average are the most common aggregation functions used in the pooling step. To improve the aggregation of relevant information without degrading their discriminative power for image classification, we introduce a simple but effective scheme based on Ordered Weighted Average (OWA) aggregation operators. We present a method to learn the weights of the OWA aggregation oper-ator in a Bag-of-Words framework and in Convolutional Neural Networks, and provide an extensive evaluation showing that OWA based pooling outperforms classical aggregation operators. (c) 2020 Elsevier B.V. All rights reserved.

Keywords:

Pooling

Ordered weighted aggregation

Image classification

Bag-of-words

Mid-level features

Convolutional neural networks

Global pooling

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