The nature of statistical learning theory
The nature of statistical learning theory
Statistical Digital Signal Processing and Modeling
Statistical Digital Signal Processing and Modeling
ECCV '98 Proceedings of the 5th European Conference on Computer Vision-Volume II - Volume II
Laplacian Eigenmaps for dimensionality reduction and data representation
Neural Computation
Robust Real-Time Face Detection
International Journal of Computer Vision
Face Recognition Using Laplacianfaces
IEEE Transactions on Pattern Analysis and Machine Intelligence
Document Clustering Using Locality Preserving Indexing
IEEE Transactions on Knowledge and Data Engineering
Regularized locality preserving indexing via spectral regression
Proceedings of the sixteenth ACM conference on Conference on information and knowledge management
Journal of Cognitive Neuroscience
Recognition of dietary activity events using on-body sensors
Artificial Intelligence in Medicine
Detecting mastication by using microwave Doppler sensor
Proceedings of the 1st international conference on PErvasive Technologies Related to Assistive Environments
Orthogonal Laplacianfaces for Face Recognition
IEEE Transactions on Image Processing
Image-Based Human Age Estimation by Manifold Learning and Locally Adjusted Robust Regression
IEEE Transactions on Image Processing
Hi-index | 0.00 |
Steady increases in healthcare costs and obesity have inspired recent studies into cost-effective, assistive systems capable of monitoring dietary habits. Few researchers, though, have investigated the use of video as a means of monitoring dietary activities. Video possesses several inherent qualities, such as passive acquisition, that merits its analysis as an input modality for such an application. To this end, we propose a method to automatically detect chewing events in surveillance video of a subject. Firstly, an Active Appearance Model (AAM) is used to track a subject's face across the video sequence. It is observed that the variations in the AAM parameters across chewing events demonstrate a distinct periodicity. We utilize this property to discriminate between chewing and non-chewing facial actions such as talking. A feature representation is constructed by applying spectral analysis to a temporal window of model parameter values. The estimated power spectra subsequently undergo non-linear dimensionality reduction. The low-dimensional embedding of the power spectra are employed to train a binary Support Vector Machine classifier to detect chewing events. To emulate the gradual onset and offset of chewing, smoothness is imposed over the class predictions of neighboring video frames in order to deter abrupt changes in the class labels. Experiments are conducted on a dataset consisting of 37 subjects performing each of five actions, namely, open- and closed-mouth chewing, clutter faces, talking, and still face. Experimental results yielded a cross-validated percentage agreement of 93.0%, indicating that the proposed system provides an efficient approach to automated chewing detection.