Evaluating Liveness by Face Images and the Structure Tensor.
Klaus KollreiderHartwig FronthalerJosef BigünPublished in: AutoID (2005)
Keyphrases
- face images
- structure tensor
- face recognition
- human faces
- anisotropic diffusion
- facial features
- optical flow
- facial expressions
- feature vectors
- principal component analysis
- input image
- high resolution
- feature points
- human vision
- training set
- feature extraction
- spatial structure
- positive definite
- data sets
- edge information
- medical images
- facial images
- partial differential equations
- covariance matrix
- image denoising
- sparse representation
- support vector machine
- training data
- decision trees