Image pickup apparatus, image pickup method, and program therefor
First Claim
1. An image pickup apparatus comprising:
- an image pickup unit configured to selectively perform an image capturing operation in a normal image capturing mode in which an exposure image signal is output in a unit period and an image capturing operation in a combined image capturing mode in which a long-exposure image signal with a relatively long exposure time and a short-exposure image signal with a relatively short exposure time are output in the unit period;
a signal processing unit configured to generate a combined image signal with a relatively wide dynamic range at least wider than that of the long-exposure image signal or that of the short-exposure image signal by combining the long-exposure image signal and the short-exposure image signal obtained in the image capturing operation in the combined image capturing mode by using the image pickup unit;
a detection unit configured to generate a luminance integrated value of the combined image signal; and
a control unit configured to perform exposure correction control using the luminance integrated value, the control unit initializes a correction value for use in the exposure correction control when the image pickup unit switches from an image capturing operation state in the normal image capturing mode to an image capturing operation state in the combined image capturing mode and causes the image pickup unit to switch from the image capturing operation state in the combined image capturing mode to the image capturing operation state in the normal image capturing mode when a change in the luminance integrated value obtained by the detection unit is greater than or equal to a predetermined value.
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Abstract
An image pickup apparatus includes an image pickup unit selectively performing an image capturing operation in a normal image capturing mode where an exposure image signal is output in a unit period and a combined image capturing mode where long- and short-exposure image signals are output in the unit period; a signal processing unit generating a combined image signal with a dynamic range wider than that of the long-exposure image signal or the short-exposure image signal by combining the long-exposure image signal and the short-exposure image signal; a detection unit generating a luminance integrated value of the combined image signal; and a control unit performing exposure correction control using the luminance integrated value. The control unit initializes a correction value used in the exposure correction control when the mode is switched from the normal image capturing mode to the combined image capturing mode.
13 Citations
14 Claims
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1. An image pickup apparatus comprising:
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an image pickup unit configured to selectively perform an image capturing operation in a normal image capturing mode in which an exposure image signal is output in a unit period and an image capturing operation in a combined image capturing mode in which a long-exposure image signal with a relatively long exposure time and a short-exposure image signal with a relatively short exposure time are output in the unit period; a signal processing unit configured to generate a combined image signal with a relatively wide dynamic range at least wider than that of the long-exposure image signal or that of the short-exposure image signal by combining the long-exposure image signal and the short-exposure image signal obtained in the image capturing operation in the combined image capturing mode by using the image pickup unit; a detection unit configured to generate a luminance integrated value of the combined image signal; and a control unit configured to perform exposure correction control using the luminance integrated value, the control unit initializes a correction value for use in the exposure correction control when the image pickup unit switches from an image capturing operation state in the normal image capturing mode to an image capturing operation state in the combined image capturing mode and causes the image pickup unit to switch from the image capturing operation state in the combined image capturing mode to the image capturing operation state in the normal image capturing mode when a change in the luminance integrated value obtained by the detection unit is greater than or equal to a predetermined value. - View Dependent Claims (2, 3, 4, 5, 6, 7)
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8. An image pickup method comprising the steps of:
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performing an image capturing operation in a normal image capturing mode in which an exposure image signal is output in a unit period while performing exposure correction control; and initializing a correction value for use in the exposure correction control when an image capturing operation state in the normal image capturing mode is switched to an image capturing operation state in a combined image capturing mode in which a long-exposure image signal with a relatively long exposure time and a short-exposure image signal with a relatively short exposure time are output in the unit period performing, in the combined image capturing mode, the image capturing operation while performing the exposure correction control; generating a combined image signal with a relatively wide dynamic range at least wider than that of the long-exposure image signal or that of the short-exposure image signal by combining the long-exposure image signal and the short-exposure image signal in the combined image capturing mode; generating a luminance integrated value of the combined image signal, switching the image capturing operation state in the combined image capturing mode to the image capturing operation state in the normal image capturing mode when a change in the luminance integrated value is greater than or equal to a predetermined value. - View Dependent Claims (9, 10, 11, 12, 13)
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14. A non-transitory computer readable storage medium encoded with computer readable instructions that when executed by a computer cause the computer to execute an image pickup method, comprising:
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performing an image capturing operation in a normal image capturing mode in which an exposure image signal is output in a unit period while performing exposure correction control; and initializing a correction value for use in the exposure correction control when an image capturing operation state in the normal image capturing mode is switched to an image capturing operation state in a combined image capturing mode in which a long-exposure image signal with a relatively long exposure time and a short-exposure image signal with a relatively short exposure time are output in the unit period performing, in the combined image capturing mode, the image capturing operation while performing the exposure correction control; generating a combined image signal with a relatively wide dynamic range at least wider than that of the long-exposure image signal or that of the short-exposure image signal by combining the long-exposure image signal and the short-exposure image signal in the combined image capturing mode; generating a luminance integrated value of the combined image signal, switching the image capturing operation state in the combined image capturing mode to the image capturing operation state in the normal image capturing mode when a change in the luminance integrated value is greater than or equal to a predetermined value.
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Specification