Imaging apparatus and method where an output of data indicating a result of a correlation calculation is intermittently performed
An imaging apparatus includes an imaging element for outputting focus detecting signals. A DFE performs phase difference detection-type focus detecting calculation using an output signal of the imaging element. A CPU controls a focus drive circuit depending on the result of calculation and a focus lens is driven so as to perform a focus adjusting operation. The CPU controls the DFE to intermittently execute focus detecting calculation at a predetermined frequency set for a plurality of image frames. In the first mode, AF processing is executed at a rate of once in a few frames and the operation of a circuit unit for performing correlation calculation or the like is stopped in a frame period during which no focus detecting calculation is performed, whereas in the second mode, AF processing is executed for each frame so as to perform a focus adjusting operation following the movement of an object.
1. An imaging apparatus comprising:
an imaging element that includes pixel portions each having a plurality of photoelectric conversion units;
a drive unit configured to drive a focus adjusting lens;
a first processing unit configured to acquire a signal output by the imaging element and to output a first image signal for a focus detection and a second image signal for the focus detection and an image generation;
a second processing unit configured to acquire the second image signal from the first processing unit so as to perform development processing;
a calculation unit configured to acquire the first image signal and the second image signal from the first processing unit so as to perform phase difference detection-type focus detecting calculation by correlation calculation between the first image signal and a third image signal generated from the first image signal and the second image signal; and
a control unit configured to acquire data indicating the result of the correlation calculation so as to calculate a defocus amount and to control the drive unit so as to perform focus adjustment,
wherein the control unit controls the calculation unit, and
wherein an output of the data indicating the result of the correlation calculation from the calculation unit to the control unit is intermittently performed at a frequency set for a plurality of image frames in accordance with an output of the second image signal from the first processing unit to the second processing unit.
2. An imaging apparatus comprising:
an imaging element that includes pixel portions each having a plurality of photoelectric conversion units;
a drive unit configured to drive a focus adjusting lens;
a first processing unit configured to acquire a signal output by the imaging element and to output a first image signal for a focus detection and a second image signal for the focus detection and an image generation;
a second processing unit configured to acquire the second image signal from the first processing unit so as to perform development processing;
a calculation unit configured to acquire the first image signal and the second image signal from the first processing unit so as to perform phase difference detection-type focus detecting calculation by correlation calculation between the first image signal and a third image signal generated from the first image signal and the second image signal; and
a control unit configured to acquire data indicating the result of the correlation calculation so as to calculate a defocus amount and to control the drive unit so as to perform focus adjustment,
wherein the control unit controls the calculation unit, and
wherein an output of the data indicating the result of the correlation calculation from the calculation unit to the control unit (a) is performed at a rate of once for a plurality of image frames in a first mode and (b) is performed at a frequency more than that in the first mode in a second mode, in accordance with an output of the second image signal from the first processing unit to the second processing unit.
3. The imaging apparatus according to claim 1 , wherein the calculation unit comprises a data output unit configured to output the data indicating the result of the correlation calculation, and the control unit stops the operation of the data output unit in a frame period during which the focus detecting calculation is not performed.
4. The imaging apparatus according to claim 2 , wherein the calculation unit comprises a data output unit configured to output the data indicating the result of the correlation calculation, and the control unit stops the operation of the data output unit in a frame period during which the focus detecting calculation is not performed.
5. The imaging apparatus according to claim 1 , wherein the calculation unit comprises a correlation calculation processing unit configured to perform correlation calculation between the first image signal and the third image signal, and the control unit stops processing performed by the correlation calculation processing unit in a frame period during which the focus detecting calculation is not performed.
6. The imaging apparatus according to claim 2 , further comprising:
an operation unit configured to provide still image capturing instructions,
wherein, when the control unit receives still image capturing instructions from the operation unit, the control unit controls to change an operation mode to the second mode.
7. The imaging apparatus according to claim 6 , wherein the calculation unit comprises a data output unit configured to output the data indicating the result of the correlation calculation and a correlation calculation processing unit configured to perform correlation calculation between the first image signal and the third image signal, and the control unit controls to start the operation of the data output unit immediately after correlation calculation by the correlation calculation processing unit in a frame period during which the focus detecting calculation is performed in the second mode, whereas the control unit controls to stop the operation of the data output unit and the processing by the correlation calculation processing unit in a frame period during which the focus detecting calculation is not performed.
8. The imaging apparatus according to claim 7 , wherein, after completion of a read operation by the imaging element in the first mode, the control unit controls to start the operation of the data output unit.
9. The imaging apparatus according to claim 1 , wherein the control unit changes a timing for outputting the data indicating the result of the correlation calculation depending on the position of a focus detecting area calculated by the calculation unit.
10. The imaging apparatus according to claim 1 , wherein the control unit controls to stop clock supply to the calculation unit in a frame period during which the focus detecting calculation is not performed.
11. The imaging apparatus according to claim 1 , wherein the control unit controls to stop output of a focus detecting signal from the imaging element in a frame period during which the focus detecting calculation is not performed.
12. A control method executed by an imaging apparatus that comprises (a) an imaging element that includes pixel portions each having a plurality of photoelectric conversion units and (b) a drive unit configured to drive a focus adjusting lens, the control method comprising:
acquiring, by a first processing unit, a signal output by the imaging element and outputting a first image signal for a focus detection and a second image signal for the focus detection and an image generation;
acquiring, by a second processing unit, the second image signal from the first processing unit so as to perform development processing;
acquiring, by a calculation unit, the first image signal and the second image signal from the first processing unit so as to perform phase difference detection-type focus detecting calculation by correlation calculation between the first image signal and a third image signal generated from the first image signal and the second image signal; and
acquiring, by a control unit, data indicating the result of the correlation calculation so as to calculate a defocus amount, and controlling the drive unit so as to perform focus adjustment,
wherein, in the calculation unit, an output of the data indicating the result of the correlation calculation from the calculation unit to the control unit is intermittently performed at a frequency set for a plurality of image frames in accordance with an output of the second image signal from the first processing unit to the second processing unit.
13. A control method executed by an imaging apparatus that comprises (a) an imaging element that includes pixel portions each having a plurality of photoelectric conversion units and (b) a drive unit configured to drive a focus adjusting lens, the control method comprising:
acquiring, by a first processing unit, a signal output by the imaging element and outputting a first image signal for a focus detection and a second image signal for the focus detection and an image generation;
acquiring, by a second processing unit, the second image signal from the first processing unit so as to perform development processing;
acquiring, by a calculation unit, the first image signal and the second image signal from the first processing unit so as to perform phase difference detection-type focus detecting calculation by correlation calculation between the first image signal and a third image signal generated from the first image signal and the second image signal; and
acquiring, by a control unit, data indicating the result of the correlation calculation so as to calculate a defocus amount and controlling the drive unit so as to perform focus adjustment,
wherein, in the calculation unit, an output of the data indicating the result of the correlation calculation unit to the control unit (a) is performed at a rate of once in a plurality of image frames in a first mode and (b) is performed at a frequency more than that in the first mode in a second mode, in accordance with an output of the second image signal from the first processing unit to the second processing unit.
14. An imaging apparatus comprising:
an imaging element that includes pixel portions each having a plurality of photoelectric conversion units;
a drive unit configured to drive a focus adjusting lens;
a memory; and
a processor in communication with the memory, the processor being configured to control:
(1) a first processing unit configured to acquire a signal output by the imaging element and to output a first image signal for a focus detection and a second image signal for the focus detection and an image generation;
(2) a second processing unit configured to acquire the second image signal from the first processing unit so as to perform development processing;
(3) a calculation unit configured to acquire the first image signal and the second image signal from the first processing unit so as to perform phase difference detection-type focus detecting calculation by correlation calculation between the first image signal and a third image signal generated from the first image signal and the second image signal; and
(4) a control unit configured to acquire data indicating the result of the correlation calculation so as to calculate a defocus amount and control the drive unit so as to perform focus adjustment,
wherein an output of the data indicating the result of the correlation calculation from the calculation unit to the control unit is intermittently performed at a frequency set for a plurality of image frames in accordance with an output of the second image signal from the first processing unit to the second processing unit.
15. An imaging apparatus comprising:
an imaging element that includes pixel portions each having a plurality of photoelectric conversion units;
a drive unit configured to drive a focus adjusting lens;
a memory; and
a processor in communication with the memory, the processor being configured to control:
(1) a first processing unit configured to acquire a signal output by the imaging element and to output a first image signal for a focus detection and a second image signal for the focus detection and an image generation;
(2) a second processing unit configured to acquire the second image signal from the first processing unit so as to perform development processing;
(3) a calculation unit configured to acquire the first image signal and the second image signal from the first processing unit so as to perform phase difference detection-type focus detecting calculation by correlation calculation between the first image signal and a third image signal generated from the first image signal and the second image signal; and
(4) a control unit configured to acquire data indicating the result of the correlation calculation so as to calculate a defocus amount and to control the drive unit so as to perform focus adjustment,
wherein an output of the data indicating the result of the correlation calculation from the calculation unit to the control unit (a) is performed at a rate of once for a plurality of image frames in a first mode and (b) is performed-at a frequency more than that in the first mode in a second mode, in accordance with an output of the second image signal from the first processing unit to the second processing unit.
16. The imaging apparatus according to claim 14 , wherein the calculation unit comprises a data output unit configured to output the data indicating the result of the correlation calculation, and
wherein the control unit stops the operation of the data output unit in a frame period during which the focus detecting calculation is not performed.
17. The imaging apparatus according to claim 15 , wherein the calculation unit comprises a data output unit configured to output the data indicating the result of the correlation calculation, and
wherein the control unit stops the operation of the data output unit in a frame period during which the focus detecting calculation is not performed.
18. The imaging apparatus according to claim 14 , wherein the calculation unit comprises a correlation calculation processing unit configured to perform correlation calculation between the first image signal and the third image signal, and
wherein the control unit stops processing performed by the correlation calculation processing unit in a frame period during which the focus detecting calculation is not performed.
19. The imaging apparatus according to claim 15 , further comprising:
an operation unit configured to provide still image capturing instructions,
wherein, when the control unit receives still image capturing instructions from the operation unit, the control unit controls to change an operation mode to the second mode.
20. The imaging apparatus according to claim 19 , wherein the calculation unit comprises a data output unit configured to output the data indicating the result of the correlation calculation and a correlation calculation processing unit configured to perform correlation calculation between the first image signal and the third image signal, and
wherein the control unit controls to start the operation of the data output unit immediately after correlation calculation by the correlation calculation processing unit in a frame period during which the focus detecting calculation is performed in the second mode, whereas the control unit controls to stop the operation of the data output unit and the processing by the correlation calculation processing unit in a frame period during which the focus detecting calculation is not performed.
21. The imaging apparatus according to claim 20 , wherein, after completion of a read operation by the imaging element in the first mode, the control unit controls to start the operation of the data output unit.
22. The imaging apparatus according to claim 14 , wherein the control unit changes a timing for outputting the data indicating the result of the correlation calculation depending on the position of a focus detecting area calculated by the calculation unit.
23. The imaging apparatus according to claim 14 , wherein the control unit controls to stop clock supply to the calculation unit in a frame period during which the focus detecting calculation is not performed.
24. The imaging apparatus according to claim 14 , wherein the control unit controls to stop output of a focus detecting signal from the imaging element in a frame period during which the focus detecting calculation is not performed.
25. A control method for execution by an imaging apparatus that comprises (a) an imaging element that includes pixel portions each having a plurality of photoelectric conversion units and (b) a drive unit configured to drive a focus adjusting lens, the control method comprising:
acquiring, by a first processing unit, a signal output by the imaging element, and outputting a first image signal for a focus detection and a second image signal for the focus detection and an image generation;
acquiring, by a second processing unit, the second image signal from the first processing unit so as to perform development processing;
acquiring, by a calculation unit, the first image signal and the second image signal from the first processing unit so as to perform phase difference detection-type focus detecting calculation by correlation calculation between the first image signal and a third image signal generated from the first image signal and the second image signal; and
acquiring, by a control unit, data indicating the result of the correlation calculation so as to calculate a defocus amount and controlling the drive unit so as to perform focus adjustment,
wherein, in the calculation unit, an output of the data indicating the result of the correlation calculation from the calculation unit to the control unit is intermittently performed at a frequency set for a plurality of image frames in accordance with an output of the second image signal from the first processing unit to the second processing unit.
26. A control method for execution by an imaging apparatus that comprises (a) an imaging element that includes pixel portions each having a plurality of photoelectric conversion units and (b) a drive unit configured to drive a focus adjusting lens, the control method comprising:
acquiring, by a first processing unit, a signal output by the imaging element and outputting a first image signal for a focus detection and a second image signal for the focus detection and an image generation;
acquiring, by a second processing unit, the second image signal from the first processing unit so as to perform development processing;
acquiring, by a calculation unit, the first image signal and the second image signal from the first processing unit so as to perform phase difference detection-type focus detecting calculation by correlation calculation between the first image signal and a third image signal generated from the first image signal and the second image signal; and
acquiring, by a control unit, data indicating the result of the correlation calculation so as to calculate a defocus amount and controlling the drive unit so as to perform focus adjustment,
wherein, in the calculation unit, an output of the data indicating the result of the correlation calculation from the calculation unit to the control unit (a) is performed at a rate of once in a plurality of image frames in a first mode and (b) is performed at a frequency more than that in the first mode in a second mode, in accordance with an output of the second image signal from the first processing unit to the second processing unit.