4087
We develop Wallflower , a three-component system for background maintenance : the pixel-level component performs Wiener filtering to make probabilistic predictions of the expected background ; the region-level component fills in homogeneous regions of foreground objects ; and the frame-level component detects sudden , global changes in the image and swaps in better approximations of the background .
 used for: three-component system, background maintenance; part of: pixel-level component, three-component system; conjunction: pixel-level component, region-level component; used for: Wiener filtering, pixel-level component; used for: Wiener filtering, probabilistic predictions of the expected background; part of: region-level component, three-component system; used for: region-level component, homogeneous regions of foreground objects; conjunction: region-level component, frame-level component; part of: frame-level component, three-component system
Given options, please tell me the relationships of all the listed entity pairs.Output format is "relation1: word1, word2; relation2: word3, word4". 
Option: conjunction, feature of, hyponym of, used for, part of, compare, evaluate for 
Text: {0} 
 Entity Pairs:  three-component system, background maintenance; pixel-level component, three-component system; pixel-level component, region-level component; Wiener filtering, pixel-level component; Wiener filtering, probabilistic predictions of the expected background; region-level component, three-component system; region-level component, homogeneous regions of foreground objects; region-level component, frame-level component; frame-level component, three-component system 
Answer:
 used for: three-component system, background maintenance; part of: pixel-level component, three-component system; conjunction: pixel-level component, region-level component; used for: Wiener filtering, pixel-level component; used for: Wiener filtering, probabilistic predictions of the expected background; part of: region-level component, three-component system; used for: region-level component, homogeneous regions of foreground objects; conjunction: region-level component, frame-level component; part of: frame-level component, three-component system