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Phase 1 performance ramping of the HAPLS pump laser, a high-energy DPSSL based on Nd:glass, successfully produced 70J at 1053nm from a single aperture and 39J at 527nm using LBO frequency converter running at 3.3Hz repetition rate.
Trichromacy might have evolved in primates for the purpose of emotion recognition [1]. Emotional states change the quantity of blood and its oxygenation under the skin, which cause subtle changes in skin color to become visible, especially in the face. We manipulated photos of basic emotional expressions so that skin color was either congruent or incongruent (according to [1]) with the expression...
Automatic facial action unit (AU) detection from video is a long-standing problem in computer vision. Two main approaches have been pursued: (1) static modeling - typically posed as a discriminative classification problem in which each video frame is evaluated independently; (2) temporal modeling - frames are segmented into sequences and typically modeled with a variant of dynamic Bayesian networks...
We propose a new method to evaluate the depth from defocus. Using two blurred images we measure the difference of blur level at pixel locations that correspond to intensity discontinuities. The two images are acquired from the same point of view with different focus settings. The proposed algorithm is based on the computation of the ratio of the magnitude of gradients computed from the two images...
We propose to describe a new SVM-based method of face recognition, with RBF kernels, relying on class redundancy. The images extracted from the video flow are formatted then reduced by a PCA technique. The built vectors are used in the training phase to set up the SVMs. Some image pre-processing steps are applied in order to improve the results. We present results, in the form of a set of curves,...
Our idea deals with a spatial approach of depth perception based on blur analysis with three images of the same scene. In the first part of the paper, we discuss some models used and the assumptions made. We demonstrate how depth cues can be extracted from images of the same scene. Theoretical developments are made to highlight the possibilities of developing our method for real-time applications...
A series of studies on Medium Access Control (MAC) protocol has been constructed in the literature to improve medium access performance in different aspects as identified by the different performance metrics. In this paper we study media access protocols for distributed wireless networks and describe a carrier sense multiple access protocol for ad hoc networks, which uses a dynamic p-persistent algorithm...
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