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Nested Sparse Quantization for Efficient Feature Coding

Xavier Boix, Gemma Roig, Luc Van Gool
ECCV
2012

Abstract

Many state-of-the-art methods in object recognition extract features from an image and encode them, followed by a pooling step and classification. Within this processing pipeline, often the encoding step is the bottleneck, for both computational efficiency and performance. We present a novel assignment-based encoding formulation. It allows for the fusion of assignment-based encoding and sparse coding into one formulation. We also use this to design a new, very efficient, encoding. At the heart of our formulation lies a quantization into a set of k-sparse vectors, which we denote as sparse quantization. We design the new encoding as two nested, sparse quantizations. Its efficiency stems from leveraging bitwise representations. In a series of experiments on standard recognition benchmarks, namely Caltech 101, PASCAL VOC 07 and ImageNet, we demonstrate that our method achieves results that are competitive with the state-of-the-art, and requires orders of magnitude less time and memory. Our method is able to encode one million images using 4 CPUs in a single day, while maintaining a good performance.


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@InProceedings{eth_biwi_00933,
  author = {Xavier Boix and Gemma Roig and Luc Van Gool},
  title = {Nested Sparse Quantization for Efficient Feature Coding},
  booktitle = {ECCV},
  year = {2012},
  keywords = {}
}