Photoarray for detecting time-dependent image data

Details Photoarray for detecting time-dependent image data Photoarray for detecting time-dependent image data

H - Electricity

04

N

H04N 5/351 (2011.01) G06T 1/00 (2006.01)

Patent

CA 2609623

The photoarray comprises a one- or two- dimensional array of cells (10), where each cell (10) has a photosensor (D, Tl - T4) generating a sensor signal dependent on a light intensity at the cell (10), a first capacitor (Cl) being charged by the time-derivative of the current, at least one threshold detector (T9 - TIl; T12 - T14) detecting if the voltage over the first capacitor (Cl) exceeds a threshold value and generating an output signal if yes, and a discharge device (T7) for discharging the first capacitor after occurrence of said output signal. Such a cell is generates an event only when the incoming light intensity changes, which reduces the amount of data to be processed from the photoarray.

L'invention concerne un photoagencement comprenant un ou deux agencements dimensionnels de cellules (10), chaque cellule (10) présentant un photocapteur (D, T1/T4) générant un signal de capteur dépendant d'une intensité lumineuse au niveau de la cellule (10), un premier condensateur C1 étant chargé par la dérivée temporelle du courant, au moins un détecteur de seuil (T9/T11; T12/T14) détectant si la tension dans le premier condensateur (C1) dépasse une valeur seuil et générant un signal de sortie le cas échéant, et un dispositif de décharge (T7) pour décharger le premier condensateur après l'apparition du signal de sortie. Une telle cellule génère un événement seulement lorsque l'intensité lumineuse entrante change, ce qui réduit la quantité de données à traiter en provenance du photoagencement.

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