Dimensionality Reduction for Distributed Vision Systems Using Random Projection

Dimensionality reduction is an important issue in the context of distributed vision systems. Processing of dimensionality reduced data requires far less network resources (e.g., storage space, network bandwidth) than processing of original data. In this paper we explore the performance of the random projection method for distributed smart cameras. In our tests, random projection is compared to principal component analysis in terms of recognition efficiency (i.e., object recognition). The results obtained on the COIL-20 image data set show good performance of the random projection in comparison to the principal component analysis, which requires distribution of a subspace and therefore consumes more resources of the network. This indicates that random projection method can elegantly solve the problem of subspace distribution in embedded and distributed vision systems. Moreover, even without explicit orthogonalization or normalization of random projection transformation subspace, the method achieves good object recognition efficiency.