An automated method for characterization of facial expression
R Rashmika., Sudha Mercy, Sangeetha Kamatchi. C, Raja Preethi V · International Journal for Advance Research and Development · 2018
This paper presents a new facial expression technique, locality directional ternary pattern (LDTP), for facial emotion recognition. LDTP efficiently encode various information of expression-related features (i.e., eyes, eyebrows, nose, mouth and lips) by using the directional information and advanced pattern in order to take advantage of the robust of advanced patterns in the edge region while overcoming the weakness of other methods in smooth regions. Our proposal, unlike existing face description methods that divide the face into multiple regions and sample the codes uniformly, uses a two-level grid to construct the face descriptor while sampling emotion information at different scales. We use a grid for stable codes (highly related to non-expression), and another one for active codes (highly related to expression). This multi-level approach enables us to do a finer description of facial motions while still characterizing the other features of the expression. Moreover, we learn the active pattern codes from the expression-related facial regions. We tested our method by using person-dependent and independent cross-validation schemes to evaluate the performance. We show that our approaches improve the overall accuracy of facial expression recognition on six data sets.