Arithmetic processor, arithmetic processing method, and computer readable medium storing computer program

Abstract

An arithmetic processor is provided to detect a background even when observed data values vary. The processor includes a background candidate data memorystoring data as a background candidate. In the data, an observation count, as the number of times of obtaining the same observation data, is correlated with distance data representing the observed data. The processor also includes a ranking sectionranking background candidates using the observation count as a basis; an observation count update sectioncomparing observed data with a background candidate stored in the memoryto find a match, counting observations of the background candidate if there is a match, and replacing distance data of a lowest-ranked background candidate with the observed data if there is no match; and a background determination sectiondetermining there are two backgrounds if the top two background candidates remain unchanged for a predetermined period.