0000000000308374
AUTHOR
Guy Cathébras
showing 6 related works from this author
Rétine Vidéo Rapide Réalisée en Technologie CMOS
2008
Nous présentons une rétine réalisée en technologie CMOS 0.6 μm dédiée à l’observation de phénomènes lumineux rapides. Le pixel que nous avons conçu est basé sur un principe de modulation de la durée d’une impulsion représentative du flux lumineux incident. Ce pixel a été validé par simulation SPICE grâce aux bibliothèques AMS du fondeur puis dessiné en full- custom de façon à optimiser sa surface, on a obtenu ainsi un pixel dont la dimension est de 49.2μm de coté avec un taux de remplissage de 18 %.
A Continuous Time Pattern Recognition Retina
2002
International audience; We present in this paper a pattern recognition retina operating in continuous time. During a programming phase, the reference image is acquired by the sensor. After thresholding, the resulting binary image is stored in the sensor's pixels. During the recognition phase, the retina calculates, in an analog way and in continuous time, the zero displacement intercorrelation of the current image with the binary reference image and its complement. These two intercorrelation values are output as currents. By comparing these currents to expected values, determined during the programming phase, a shift of the pattern or a difference between the observed and programmed pattern…
A Correlation Retina in Standard 0.6um : Application in Positioning System
2003
International audience; We have designed and fabricated a programmable retina that is capable of recognizing patterns stored in memory in real-time. Each of the pixels of the retina is composed of a photodiode and an electronic device used during the programming phase to digitize the image of the pattern to recognize into a binary image stored in latches. The array of pixels is thus partitioned into two complementary disjoint sub-sets with all the photodiodes of the same sub-set connected together in order to obtain the sum total of the currents. During the analysis phase, an optical correlation between the projected image and the reference binary image memorized in the circuit is done. The…
Hardware Computation of Moment Functions in a Silicon Retina Using Binary Patterns
2006
International audience; We present in this paper a method for implementing moment functions in a CMOS retina for shape recognition applications. The method is based on the use of binary patterns and it allows the computation of different moment functions such geometric and Zernike moments of any orders by an adequate choice of the binary patterns. The advantages of the method over other methods described in the literature is that it is particularly suitable for the design of a programmable retina circuit where moment functions of different orders are obtained by simply loading the correct binary patterns into the memory devices implemented on the circuit. The moment values computed by the m…
A CMOS Image Sensor Design for Speed Determination of Fast Moving Luminous Objects
2003
International audience
Masquer l'Objet pour Mieux le Reconnaître
2005
National audience; L’évolution des technologies de pointe a repoussé les limites des domaines d’application de l’imagerie numérique de sorte que les capteurs d’images sont aujourd’hui omniprésents dans beau- coup d’applications, que ce soit des applications scientifiques ou des appli- cations liées au divertissement et à un usage grand public. Ces capteurs four- nissent en général une image qui est par la suite traitée par un ordinateur ou des circuits électroniques spécialisés. La course vers la miniaturisation et vers des systèmes autonomes compacts et légers nécessite aujourd’hui des cap- teurs d’images de plus en plus petits et de faible consommation. De plus, il existe des applications…