Image capturing apparatus, image capturing method, and carrier means

1. An image capturing apparatus comprising:

a plurality of image capturers;

calculation circuitry configured to calculate a common correction value commonly applied to the image capturers in performing dynamic range correction, based on an image-capturing signal output from each of the plurality of image capturers;

setting circuitry configured to set an exposure condition for each of the image capturers based on the common correction value;

control circuitry configured to control the plurality of image capturers to capture fisheye images under the set exposure condition for each of the image capturers; and

combining processing circuitry configured to combine the fisheye images to generate a spherical image.

2. The image capturing apparatus according to claim 1 , wherein the calculation circuitry includes:

individual-value calculation circuitry to calculate an individual correction value of the dynamic range correction for each of the plurality of image capturers, based on the image-capturing signal output from each of the plurality of image capturers before capturing of the fisheye images under the set exposure condition; and

common-value calculation circuitry to calculate the common correction value based on the individual correction value calculated for each of the plurality of image capturers.

3. The image capturing apparatus according to claim 2 , wherein:

the common-value calculation circuitry selects, as the common correction value, a largest value from the individual-correction values each calculated for each of the plurality of image capturers.

4. The image capturing apparatus according to claim 1 , further comprising:

luminance transformation circuitry configured to transform a luminance of each of the fisheye images captured by the plurality of image capturers under the set exposure condition, wherein

the combining processing circuitry is configured to combine the fisheye images after the luminance of each of which has been transformed by the luminance transformation circuitry to generate the spherical image.

5. The image capturing apparatus according to claim 4 ,

output circuitry configured to output the spherical image generated by the combining processing circuitry.

6. The image capturing apparatus according to claim 3 ,

output circuitry configured to output the spherical image with addition of information for transforming luminance of each of the fisheye images of the spherical image, to an external device.

7. The image capturing apparatus according to claim 1 , wherein:

the dynamic range correction is highlight correction to set the exposure condition to underexposure according to the common correction value such that an exposure level is reduced from a proper exposure level.

8. The image capturing apparatus according to claim 1 , wherein:

the image capturing apparatus is a spherical-image capturing apparatus, and

the spherical image is a joined image obtained by joining the fisheye images.

9. An image capturing method comprising:

calculating a common correction value commonly applied to a plurality of image capturers in performing dynamic range correction, based on image-capturing signals output from the plurality of image capturers,

setting an exposure condition for each of the plurality of image capturers, based on the common correction value;

capturing fisheye images under the set exposure condition for each of the image capturers; and

combining the fisheye images to generate a spherical image.

10. The image capturing method according to claim 9 , wherein:

the calculating of the common correction value includes calculating an individual correction value of the dynamic range correction for each of the plurality of image capturers, based on the image-capturing signal output from each of the plurality of image capturers before capturing of the fisheye images under the set exposure condition; and

the calculating of the common correction value is performed based on the individual correction value calculated for each of the plurality of image capturers.

11. A non-transitory computer readable medium storing computer-executable instructions which, when executed by a computer system, cause the computer system to carry out a method comprising:

calculating a common correction value commonly applied to a plurality of image capturers in performing dynamic range correction, based on image-capturing signals output from the plurality of image capturers,

setting an exposure condition for each of the plurality of image capturers, based on the common correction value;

capturing fisheye images under the set exposure condition for each of the image capturers; and

combining the fisheye images to generate a spherical image.