Facial expression recognition Face recognition 8 Facial Expressions 6 Non-verbal human 6 Pattern recognition 6 Conditional random field 4 Expression recognition 4 Human emotion 4 K-nearest neighbors classifiers 4 Nearest neighbor search 4 Random processes 4 Sets of features 4 Static and dynamic approach 4 Training example 4 Ciencias Informáticas 2 Descriptors 2 Dynamic approaches 2 Facial expressions classification 2 Facial expressions classifications 2 Gesture recognition 2 Label distribution learning 2 ORB descriptor 2 Oriented fast and rotated brief (ORB) 2 Pattern recognition systems 2 State-of-the-art techniques 2 Texture information 2 Action unit recognition 1 Aprendizaje de distribuciones de etiquetas 1 Convolutional Neuronal Network 1 Lightweight 1