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Self-Adaptable Templates for Feature Coding

Xavier Boix, Gemma Roig, Salomon Diether, Luc Van Gool
NIPS
2014

Abstract

Hierarchical feed-forward networks have been successfully applied in object recognition. At each level of the hierarchy, features are extracted and encoded, followed by a pooling step. Within this processing pipeline, the common trend is to learn the feature coding templates, often referred as codebook entries, filters, or over-complete basis. Recently, an approach that apparently does not use templates has been shown to obtain very promising results. This is the second-order pooling (O2P) [1, 2, 3, 4, 5]. In this paper, we analyze O2P as a coding-pooling scheme. We find that at testing phase, O2P automatically adapts the feature coding tem- plates to the input features, rather than using templates learned during the training phase. From this finding, we are able to bring common concepts of coding-pooling schemes to O2P, such as feature quantization. This allows for significant accuracy improvements of O2P in standard benchmarks of image classification, namely Caltech101 and VOC07.


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@InProceedings{eth_biwi_01157,
  author = {Xavier Boix and Gemma Roig and Salomon Diether and Luc Van Gool},
  title = {Self-Adaptable Templates for Feature Coding},
  booktitle = {NIPS},
  year = {2014},
  keywords = {}
}