Photoarray for detecting time-dependent image data
AssigneeUniversitaet Zuerich
InventorsPatrick Lichtsteiner, Tobi Delbruck
Life of this patent
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Abstract
A photoarray includes a one-dimensional or two-dimensional array of cells, each having a photosensor generating a sensor signal dependent on a light intensity at the cell, a first capacitor charged by a time-derivative of a current, at least one threshold detector detecting if a voltage over the first capacitor exceeds a threshold value and generating an output signal if it does, and a discharge device for discharging the first capacitor after occurrence of the output signal. Such a cell generates an event only when the incoming light intensity changes, which reduces the amount of data to be processed from the photoarray.
Claims14
A photoarray for detecting time-dependent image data, the photoarray comprising:
- an array of cells each including:
- a photosensor generating a sensor signal dependent on a light intensity at said cell;
- a first capacitor being charged by a current proportional to a time-derivative of said sensor signal;
- at least one threshold detector detecting if a voltage over said first capacitor exceeds a threshold value and if it does generating an output signal;
- and
- a discharge device for discharging said first capacitor after occurrence of said output signal.
Dependencies are inferred from the claim text.