Abstract
Dynamic Partial Function (DPF), which dynamically selects a subset of features to measure pairwise image similarity, has been shown very effective in near-replica image recognition. DPF, however, suffers from the one-size-fits-all problem: it requires that all pair-wise similarity measurements must use the same number of features. In this paper, we propose methods for enhancing DPF's performance by allowing different numbers of features to be selected in a pairwise manner. Through extensive empirical studies, we show that our three schemes- Thresholding, Sampling, and Weighting- and hybrid schemes of these three basic approaches, substantially outperform DPF in near-replica image recognition.