Conference paper
Transformation invariant sparse coding
Sparse coding is a well established principle for unsupervised learning. Traditionally, features are extracted in sparse coding in specific locations, however, often we would prefer invariant representation. This paper introduces a general transformation invariant sparse coding (TISC) model. The model decomposes images into features invariant to location and general transformation by a set of specified operators as well as a sparse coding matrix indicating where and to what degree in the original image these features are present.
The TISC model is in general overcomplete and we therefore invoke sparse coding to estimate its parameters. We demonstrate how the model can correctly identify components of non-trivial artificial as well as real image data. Thus, the model is capable of reducing feature redundancies in terms of pre-specified transformations improving the component identification.
Language: | English |
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Publisher: | IEEE |
Year: | 2011 |
Pages: | 1-6 |
Proceedings: | 2011 IEEE International Workshop on Machine Learning for Signal Processing |
Series: | Machine Learning for Signal Processing |
ISBN: | 1457716216 , 1457716224 , 1457716232 , 9781457716218 , 9781457716225 and 9781457716232 |
ISSN: | 21610363 and 15512541 |
Types: | Conference paper |
DOI: | 10.1109/MLSP.2011.6064547 |
ORCIDs: | Mørup, Morten and Schmidt, Mikkel Nørgaard |