Data rate control for event-based vision sensor
AssigneeInsightness AG
InventorsRaphaël Berner, Christian Brändli, Massimo Zannoni
Life of this patent
Estimating the term…
Abstract
In dynamic vision sensor (DVS) or change detection sensors, the chip or sensor is configured to control or modulate the event rate. For example, this control can be used to keep the event rate close to a desired rate or within desired bounds. Adapting the configuration of the sensor to the scene by changing the ON-event and/or the OFF-event thresholds, allows having necessary amount of data, but not much more than necessary, such that the overall system gets as much information about its state as possible.
Claims35
A change detection sensor, comprising:
- a pixel array comprising pixels that detect light, wherein the pixels comprise photosensors and photoreceptor circuits that output first signals based on the response of the photosensors;
- event detectors for detecting events associated with light received by the pixels by comparing the first signals and a first reference voltage;
- an event rate detector for counting the events with a counter;
- and
- a controller for changing how the pixels detect the events based on the event rate detector by changing the first reference voltage;
- wherein the controller compares an event rate provided by the event rate detector to a maximum event rate, if the event rate is larger than the maximum event rate the controller changes a time resolution of the sensor.
A method of operation of a change detection sensor, the method comprising:
- detecting light with pixels of a pixel array, wherein the pixels comprise circuits that output first signals based on the response of photosensors of the pixels;
- detecting events associated with light received by the pixels by comparing the first signals and a first reference voltage;
- counting the events with a counter with an event rate detector;
- changing how the pixels detect the events based on the event rate detector by changing the first reference voltage;
- comparing an event rate provided by the event rate detector to a maximum event rate;
- and
- if the event rate is larger than the maximum event rate, changing a time resolution of the sensor.
A change detection sensor, comprising:
- a pixel array comprising pixels that detect light;
- event detectors for detecting ON events associated with light received by the pixels;
- an event rate detector for assessing the events;
- and
- a controller for changing how the pixels detect the events based on the event rate detector.
A method of operation of a change detection sensor, the method comprising:
- detecting ON events associated with light received by pixels in a pixel array;
- assessing the events from the pixel array;
- and
- changing how the pixels detect the events based on the assessment of the events from the pixel array.
A change detection sensor, comprising:
- a pixel array comprising pixels that detect light, wherein the pixels comprise photosensors and photoreceptor circuits that output photosensor signals based on the response of the photosensors;
- event detectors for detecting events associated with light received by the pixels by comparing the photosensor signals and a reference voltage;
- an event rate detector for assessing the events;
- and
- a controller for changing how the pixels detect the events based on the event rate detector to change the number of events for different modes of the sensor.
Dependencies are inferred from the claim text.