Search results for "Signal and Image processing"
showing 10 items of 454 documents
Perceptual Spatial Uniformity Assessment of Projection Displays with a Calibrated Camera
2014
International audience; Spatial uniformity is one of the most important image quality attributes in visual experience of displays. In conventional researches, spatial uniformity was mostly measured with a radiometer and its quality was assessed with non-reference image quality metrics. Cameras are cheaper than radiometers and they can provide accurate relative measurements if they are carefully calibrated. In this paper, we propose and implement a work-flow to use a calibrated camera as a relative acquisition device of intensity to measure the spatial uniformity of projection displays. The camera intensity transfer functions for every projected pixels are recovered, so we can produce multip…
High Dynamic Range Real-time Vision System for Robotic Applications
2012
International audience; Robotics applications often requires vision systems capable of capturing a large amount of information related to a scene. With many camera sensors, the perception of information is limited in areas with strong contrasts. The High Dynamic Range (HDR) vision system can deal with these limitations. This paper describes the HDR-ARtiSt hardware platform (High Dynamic Range Advanced Real-time imaging System), a FPGA-based architecture that can produce a real- time high dynamic range video from successive image acquisition.
Automatic spatial and temporal organization of long range video sequences from low level motion features
2014
International audience; In this paper, we address the analysis of activities from long range video sequences. We present a method to automatically extract spatial and temporal structure from a video sequence from low level motion features. The scene layout is first extracted, with a set of regions that have homogeneous activities called Motion Patterns. These regions are then analyzed and the recurrent temporal motifs are extracted for each Motion Patterns. Preliminary results show that our method can accurately extract important temporal motifs from video surveillance sequences.
Spatial resolution improvement of MeRIS Images by Fusion with Thematic Mapper Images
2001
International audience; no abstract
Re-evaluation of the extent of Caulerpa taxifolia development in the northern Mediterranean using airborne spectrographic sensing
2003
International audience; no abstract
EDA, approche non linéaire de débruitage des signaux cardiaques
2013
National audience
Satellite survey of seasonal trophic status and occasional anoxic crises ?Malaigues? in the Thau lagoon using MeRIS images
2011
International audience; The Thau lagoon, located in southern France, suffers episodically from anoxic crises locally known as'malaigue'. Such crises mostly occur under warm conditions, low winds leading to a strongeutrophication of the lagoon. The development of a sulphur bacterium sometimes gives locally to thewaters a 'milky turquoise' appearance and leads to shellfish mortality. One of the indicators of theeutrophication status of the lagoon can be surveyed by the chlorophyll product provided by remotesensing images such as Medium Resolution Imaging Spectrometer (MERIS). In this paper wecompare chl2 (or algal2) estimations provided by MERIS level 2 products and the groundmeasurements of …
Débruitage des signaux cardiaques par l'approche EDA
2014
International audience
Simulation of future Geostationnary Ocean Color Images
2012
International audience; no abstract
Comparison of metrics for the classification of soils under variable geometrical conditions using hyperspectral data
2008
International audience; no abstract