Affiliation: Research Scholar, Electronics & Communication Engineering, Karunya University, Coimbatore, India.
Facial Recognition has gained interested of many researchers due to its various purposes and practical applications. Recent developments in 3D imaging technology have made it possible to use a true 3D mesh of the face for recognition. Moreover, it is now also possible to use 4D data (3D meshes changing over time) from publicly-available databases. Since the use of 3D and 4D data promises to bypass many of the issues that plague 2D images and video, such as pose and facial expression variations, the challenge is to perform expression analysis on 3D and 4D domains to achieve high face recognition rate. The key contribution of this article is two fold, firstly, we present various 3D Face Recognition techniques and secondly, we present a systematic pipeline for 4D Face Recognition (dynamic 3D sequences) which consist of Mesh Matching, RANdomSAmple Consensus (RANSAC), consecutive Annotated Face Model (AFM) Fitting and Feature Description. We evaluated both latest state of the art 3D and 4D Facial Recognition pipelines on two publicly available facial expression databases BU-3DFE and BU-4DFE and made the following observations. Among various 3D face recognition algorithms analysed Matching Tensors for Pose Invariant Automatic 3D Face Recognition gives the best recognition rate of 96.4% on BU-3DFE. Among various 4D face recognition algorithms, a dynamic geometry-based approach for 4D facial expressions recognition gives the best recognition rate of 96.71% on BU-4DFE. We have also considered several patents, such as ‘Face recognition apparatus, face recognition method, Gabor filter application apparatus, and computer program’ ‘Gabor filtering and joint sparsity model-based face recognition method’ ‘Principal component analysisbased (PCA-based) three-dimensional (3D) face recognition system’ ‘3d face recognition method based on intermediate frequency information in geometric image’ ‘Three-dimensional human face recognition method based on intermediate frequency information in geometry image’.