Sensor and control method
The present technology relates to a sensor and a control method that achieve flexible acquisition of event data. A pixel block of the sensor includes one or more pixels each configured to receive light and perform photoelectric conversion to generate an electrical signal and an event detecting section configured to detect an event that is a change in electrical signal of each of the pixels. The sensor switches connections between a plurality of the pixel blocks. The present technology is applicable to a sensor configured to detect events that are changes in electrical signal of pixels, for example.
1. A sensor comprising:
a plurality of pixel blocks, each pixel block including
one or more pixels each configured to receive light and perform photoelectric conversion to generate an electrical signal, and
an event detecting section configured to detect an event that is a change in electrical signal of any of the pixels; and
a connection control section configured to switch connections between the plurality of the pixel blocks, wherein
the connection control section connects the plurality of pixel blocks to combine photocurrents from the pixels in the plurality of pixel blocks, and
the event detecting section includes a current-voltage converting section configured to convert each of the photocurrents to a voltage with a FET (Field Effect Transistor) through which the photocurrents flow, and the connection control section switches connections between sources of the FETs of the plurality of pixel blocks.
2. The sensor according to claim 1 ,
wherein the connection control section turns on or off operation of the current-voltage converting section.
3. The sensor according to claim 1 , further comprising:
a transistor configured to transfer charges of the pixels.
4. A sensor comprising: a plurality of pixel blocks, each pixel block including
one or more pixels each configured to receive light and perform photoelectric conversion to generate an electrical signal, and
an event detecting section configured to detect an event that is a change in electrical signal of any of the pixels; and
a connection control section configured to switch connections between the plurality of the pixel blocks, wherein
the connection control section connects the plurality of pixel blocks to combine voltages corresponding to photocurrents from the pixels in the plurality of pixel blocks,
the event detecting section includes a current-voltage converting section configured to convert each of the photocurrents to a voltage with a FET (Field Effect Transistor) through which the photocurrents flow, and
the connection control section switches connections between gates of the FETs of the plurality of pixel blocks.
5. A sensor comprising:
a plurality of pixel blocks, each pixel block including
one or more pixels each configured to receive light and perform photoelectric conversion to generate an electrical signal, and
an event detecting section configured to detect an event that is a change in electrical signal of any of the pixels; and
a connection control section configured to switch connections between the plurality of the pixel blocks, wherein the event detecting section includes
a current-voltage converting section configured to convert each of photocurrents from the pixels to a voltage with a FET (Field Effect Transistor) through which the photocurrents flow, and
a subtraction section configured to obtain, with a first capacitor and a second capacitor, a difference signal corresponding to a difference between voltages at different timings corresponding to the photocurrents, and wherein
the connection control section switches connections between a connecting point between the first capacitor and the second capacitor of one of the plurality of pixel blocks and a gate of the FET of another of the pixel blocks, through a third capacitor.
6. A sensor comprising:
a plurality of pixel blocks, each pixel block including
one or more pixels each configured to receive light and perform photoelectric conversion to generate an electrical signal, and
an event detecting section configured to detect an event that is a change in electrical signal of any of the pixels; and
a connection control section configured to switch connections between the plurality of the pixel blocks, wherein the event detecting section includes
a current-voltage converting section configured to convert each of photocurrents from the pixels to a voltage,
a subtraction section configured to obtain, with a first capacitor and a second capacitor, a difference signal corresponding to a difference between voltages at different timings corresponding to the photocurrents, and
a quantization section configured to quantize the difference signal and output a quantized value obtained by the quantization, as event data indicating occurrence of an event, and wherein
the sensor further includes a calculation section configured to perform, on the event data from each of the plurality of pixel blocks, calculation based on an operating mode of the connection control section, and to output a result of the calculation.
7. A method for controlling a sensor, the sensor including a plurality of pixel blocks, each pixel block including one or more pixels each configured to receive light and perform photoelectric conversion to generate an electrical signal, the method comprising:
detecting, by an event detecting section, an event that is a change in electrical signal of any of the pixels; and
connecting, by a connection control section, the plurality of pixel blocks to combine photocurrents from the pixels in the plurality of pixel blocks, wherein
the event detecting section includes a current-voltage converting section configured to convert each of the photocurrents to a voltage with a FET (Field Effect Transistor) through which the photocurrents flow, and the connection control section switches connections between sources of the FETs of the plurality of pixel blocks.