Solid state imaging apparatus and method for handling read region
A solid state imaging apparatus comprising: an imaging area comprising a plurality of pixels that are organized into a two-dimensional plane; a scanning circuit that reads a signal from a read region that is set in at least one of a horizontal direction and a vertical direction in the imaging area; and a control unit that sets the read region to the scanning circuit, and changes, when the read region is changed, a setting of the read region by comparing the read region before the change and the read region after the change.
1. A solid state imaging apparatus comprising:
an imaging area comprising a plurality of pixels that are organized into a two-dimensional plane;
a scanning circuit that reads a signal of the pixels from the pixels of a read region that is set in at least one of a horizontal direction and a vertical direction in the imaging area; and
a control unit that changes patterns of timing of the scanning circuit according to the result of a comparison of a first read region which has already been set in the scanning circuit and a second read region which is going to be newly set in the scanning circuit.
2. The solid state imaging apparatus according to claim 1 , wherein the scanning circuit comprises:
a shift register comprising a plurality of shift register units, each of the shift register units defining a stage, each of the shift register units conveying information that is input, to a shift register unit of a next stage in response to a clock;
a storage portion that stores information stored in the shift register;
a first transfer unit that transfers information stored in the shift register to the storage portion; and
a second transfer unit that transfers information stored in the storage portion to the shift register.
3. The solid state imaging apparatus according to claim 2 , wherein the control unit executes:
the pre-scanning that is executed on the second read region which is going to be newly set prior to the actual scanning for reading a signal from the imaging area, causes the first transfer unit to store information that has been transferred to the shift register into the storage portion corresponding to the read region and
the actual scanning causes the second transfer unit to store information that has been stored in the storage portion during the pre-scanning to the shift register unit.
4. The solid state imaging apparatus according to claim 3 , wherein the control unit controls to execute the pre-scanning after the actual scanning is completed when one end of the second read region which is going to be newly set is positioned in front of the first read region which has already been set in a direction to execute the read operation.
5. The solid state imaging apparatus according to claim 3 , wherein the control unit controls to execute the pre-scanning in the actual scanning when one end of the second read region which is going to be newly set is included in the first read region which has already been set.
6. The solid state imaging apparatus according to claim 3 , wherein the control unit controls to execute the pre-scanning in the actual scanning by continuing the actual scanning when one end of the second read region which is going to be newly set is positioned behind the first read region which has already been set.
7. The solid state imaging apparatus according to claim 1 , wherein the control unit changes a setting of the scanning circuit to the second read region which is going to be newly set in a scanning period when the first read region which has already been set in the scanning circuit is read.
8. The solid state imaging apparatus according to claim 7 , wherein a reading operation of the first read region includes an operation to change a setting of a read region from the first read region to the second read region.
9. The solid state imaging apparatus according to claim 7 , wherein a read operation of the first read region serves as a storing operation of a scanning start position of the second read region.
10. A solid state imaging apparatus comprising:
an imaging area comprising a plurality of pixels that are organized into a two-dimensional plane;
a scanning circuit that reads a signal of the pixels from the pixels of a read region that is set in at least one of a horizontal direction and a vertical direction in the imaging area; and
a control unit that changes patterns of timing of the scanning circuit according to a second read region which is going to be newly set in a scanning period when a first read region which has already been set in the scanning circuit is read.
11. The solid state imaging apparatus according to claim 10 , wherein the scanning circuit comprises:
a shift register comprising a plurality of shift register units, each of the shift register units defining a stage, each of the shift register units conveying information that is input, to a shift register unit of a next stage in response to a clock;
a storage portion that stores information stored in the shift register;
a first transfer unit that transfers information stored in the shift register to the storage portion; and
a second transfer unit that transfers information stored in the storage portion to the shift register.
12. The solid state imaging apparatus according to claim 11 , wherein the control unit executes:
the pre-scanning that is executed on the second read region which is going to be newly set prior to the actual scanning for reading a signal from the imaging area, causes the first transfer unit to store information that has been transferred to the shift register into the storage portion corresponding to the read region and
the actual scanning causes the second transfer unit to store information that has been stored in the storage portion during the pre-scanning to the shift register unit.
13. The solid state imaging apparatus according to claim 12 , wherein the control unit controls to execute the pre-scanning after the actual scanning is completed when one end of the second read region which is going to be newly set is positioned in front of the first read region which has already been set in a direction to execute the read operation.
14. The solid state imaging apparatus according to claim 12 , wherein the control unit controls to execute the pre-scanning in the actual scanning when one end of the second read region which is going to be newly set is included in the first read region which has already been set.
15. The solid state imaging apparatus according to claim 12 , wherein the control unit controls to execute the pre-scanning in the actual scanning by continuing the actual scanning when one end of the second read region which is going to be newly set is positioned behind the first read region which has already been set.
16. The solid state imaging apparatus according to claim 10 , wherein a reading operation of the first read region includes an operation to change a setting of a read region from the first read region to the second read region.
17. The solid state imaging apparatus according to claim 10 , wherein a read operation of the first read region serves as a storing operation of a scanning start position of the second read region.