Semi-global shutter imager
This disclosure is directed to an image sensor. The image sensor includes a two-dimensional pixel array divided into a plurality of blocks, each of the plurality of blocks comprising pixels arranged in at least two different rows and two different columns, and a shutter mechanism that exposes the plurality of blocks sequentially, with all pixels in each block being exposed synchronously.
1. A device comprising:
a two-dimensional pixel array comprising a first block and a second block, each of the first block and the second block comprising a respective plurality of pixels, wherein the first block does not overlap the second block in the two-dimensional pixel array;
a shutter configured to:
synchronously expose, in a first time window beginning at a first time, the plurality of pixels of the first block;
synchronously expose, in a second time window beginning at a second time later than the first time, the plurality of pixels of the second block;
first readout circuitry corresponding to the first block, the first readout circuitry configured to receive, at a third time between the first time and the second time, a first signal corresponding to the first block; and
second readout circuitry, different from the first readout circuitry, corresponding to the second block, the second readout circuitry configured to receive, at a fourth time later than the second time, a second signal corresponding to the second block.
2. The device of claim 1 , wherein:
each of the first block and the second block has a respective height that is at least one twentieth of the height of the two-dimensional pixel array and no more than one fifth of the height of the two-dimensional pixel array; and
each of the first block and the second block has a respective width that is at least one twentieth of the width of the two-dimensional pixel array and no more than one fifth of the width of the two-dimensional pixel array.
3. The device of claim 1 , wherein the plurality of pixels of the first block comprises a first number of pixels, and the plurality of pixels of the second block comprises a second number of pixels, equal to the first number.
4. The device of claim 1 , wherein the plurality of pixels of the first block comprises a first number of pixels, and the plurality of pixels of the second block comprises a second number of pixels, different from the first number.
5. The device of claim 1 , wherein the plurality of pixels of the first block comprises a first geometric shape, and the plurality of pixels of the second block comprises a second geometric shape, different from the first geometric shape.
6. The device of claim 1 , further comprising a timing module, wherein:
synchronously exposing the plurality of pixels of the first block comprises synchronously exposing the plurality of pixels of the first block in response to receiving a first signal from the timing module; and
synchronously exposing the plurality of pixels of the second block comprises synchronously exposing the plurality of pixels of the second block in response to receiving the first signal from the timing module.
7. The device of claim 1 , wherein:
the device is configured to generate, based on an output of the first readout circuitry and further based on an output of the second readout circuitry, an image signal.
8. The device of claim 7 , wherein device is further configured to present the image signal as input to a SLAM algorithm.
9. A method comprising:
synchronously exposing, in a first time window beginning at a first time, a respective plurality of pixels of a first block of a two-dimensional pixel array;
synchronously exposing, in a second time window beginning at a second time later than the first time, a respective plurality of pixels of a second block of a two-dimensional pixel array, wherein the first block does not overlap the second block in the two-dimensional pixel array;
presenting, at a third time between the first time and the second time, to first readout circuitry corresponding to the first block, a first signal corresponding to the first block; and
presenting, at a fourth time later than the second time, to second readout circuitry corresponding to the second block, a second signal corresponding to the second block, wherein the first readout circuitry is different from the second readout circuitry.
10. The method of claim 9 , wherein:
each of the first block and the second block has a respective height that is at least one twentieth of the height of the two-dimensional pixel array and no more than one fifth of the height of the two-dimensional pixel array; and
each of the first block and the second block has a respective width that is at least one twentieth of the width of the two-dimensional pixel array and no more than one fifth of the width of the two-dimensional pixel array.
11. The method of claim 9 , wherein the plurality of pixels of the first block comprises a first number of pixels, and the plurality of pixels of the second block comprises a second number of pixels, equal to the first number.
12. The method of claim 9 , wherein the plurality of pixels of the first block comprises a first number of pixels, and the plurality of pixels of the second block comprises a second number of pixels, different from the first number.
13. The method of claim 9 , wherein the plurality of pixels of the first block comprises a first geometric shape, and the plurality of pixels of the second block comprises a second geometric shape, different from the first geometric shape.
14. The method of claim 9 , wherein:
synchronously exposing the plurality of pixels of the first block comprises synchronously exposing the plurality of pixels of the first block in response to receiving a first signal from a timing module; and
synchronously exposing the plurality of pixels of the second block comprises synchronously exposing the plurality of pixels of the second block in response to receiving the first signal from the timing module.
15. The method of claim 9 , further comprising generating, based on an output of the first readout circuitry and further based on an output of the second readout circuitry, an image signal.
16. The method of claim 15 , further comprising presenting the image signal as input to a SLAM algorithm.