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Table 1 Fusion approaches at the various multi-modal biometric system levels

From: MultiQ: single sensor-based multi-quality multi-modal large-scale biometric score database and its performance evaluation

Level of fusion Fusion approach
Sensor-level fusion Mosaicing
Feature-level fusion Feature concatenation
Score-level fusion Transformation-based approaches [12, 3840]
  Classification-based approaches [16, 28, 41]
  Probability density-based approaches [1315, 17, 44]
Decision-level fusion Majority voting