]> 2026-04-04T20:36:52+02:00 Publications:Non-intrusive liveness detection by face images 500 en <p>A technique evaluating liveness in face image sequences is presented. To ensure the actual presence of a live face in contrast to a photograph (playback attack), is a significant problem in face authentication to the extent that anti-spoofing measures are highly desirable. The purpose of the proposed system is to assist in a biometric authentication framework, by adding liveness awareness in a non-intrusive manner. Analyzing the trajectories of certain parts of a live face reveals valuable information to discriminate it against a spoofed one. The proposed system uses a lightweight novel optical flow, which is especially applicable in face motion estimation based on the structure tensor and inputs of a few frames. For reliable face part detection, the system utilizes a model-based local Gabor decomposition and SVM experts, where selected points from a retinotopic grid are used to form regional face models. Also the estimated optical flow is exploited to detect a face part. The whole procedure, starting with three images as input and finishing in a liveness score, is executed in near real-time without special purpose hardware. Experimental results on the proposed system are presented on both a public database and spoofing attack simulations.</p> http://dx.doi.org/10.1016/j.imavis.2007.05.004 http://hh.diva-portal.org/smash/record.jsf?searchId=1&pid=diva2:239398 244 3 Image and Vision Computing Journal Paper 233 Non-intrusive liveness detection by face images 27 2009 2016-09-30T20:39:07Z 2457662.3604977 Non-intrusive liveness detection by face images 500 0 plainlist list 1 [[:Publications:Non-intrusive liveness detection by face images]] Non-intrusive liveness detection by face images# QUERY84335b92c03012266cae5fca38176f35 500 [2,"smw-datavalue-property-restricted-annotation-use","Publisher"] Non-intrusive liveness detection by face images# ERR6c155b5d70b69ddb590b4f2e73389c2a 500 [2,"smw-datavalue-property-restricted-annotation-use","Author"] Non-intrusive liveness detection by face images# ERRe24f17e090c98448f3de99d03182b7b6