Local Ordinal Contrast Pattern Histograms for Spatiotemporal, Lip-Based Speaker Authentication
The lip-region can be interpreted as either a genetic or behavioral biometric trait depending on whether static or dynamic information is used. Despite this breadth of possible application as a biometric, lip-based biometric systems are scarcely developed in scientific literature compared to other more popular traits such as face or voice. This is because of the generalized view of the research community about the lack of discriminative power in the lip region. In this paper, the authors propose a new method of texture representation called Local Ordinal Contrast Pattern (LOCP) for use in the representation of both appearance and dynamics features observed within a given lip-region during speech production.