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Spatial Pyramid Matching (SPM) has become a standard in bag-of-words (BoW) image representation, regardless of the features used in the process. With most research focusing on other part of the BoW pipeline, the arrangement of spatial windows in SPM remains untouched except by few works. This paper takes into consideration the idea that not all spatial windows in SPM are needed, and proposes two systematic...
The rejection of non-meaningful activities is an important issue in human activity recognition (HAR) systems. This rejection is often operated as a hypothesis test based on a model representing all non-meaningful patterns. Such a 'non-meaningful' model is often difficult to obtain in reality. This paper presents a new test, the pairwise likelihood ratio test (PLRT), to reject non-meaningful activities...
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