Exposure control apparatus and control method thereof, image capturing apparatus, and storage medium
AssigneeCanon Kabushiki Kaisha
InventorYosuke Mine
Life of this patent
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Abstract
An exposure control apparatus comprises an acquisition unit including a plurality of pixels that are arranged two-dimensionally, and configured to acquire image data, a compression unit configured to compress the image data and generate compressed data, a calculation unit configured to calculate a first photometric value based on the compressed data, a conversion unit configured to convert the first photometric value into a second photometric value corresponding to the image data before the compression; and an exposure control unit configured to perform exposure control based on the second photometric value.
Claims12
An exposure control apparatus comprising:
- an acquisition unit including a plurality of pixels that are arranged two-dimensionally, and configured to acquire image data;
- a compression unit configured to compress the image data and generate compressed data;
- a calculation unit configured to calculate a first photometric value based on the compressed data;
- a conversion unit configured to convert the first photometric value into a second photometric value corresponding to the image data before the compression;
- and
- an exposure control unit configured to perform exposure control based on the second photometric value.
An image capturing apparatus comprising:
- an acquisition unit including a plurality of pixels that are arranged two-dimensionally, and configured to acquire image data;
- a compression unit configured to compress the image data and generate compressed data;
- a calculation unit configured to calculate a first photometric value based on the compressed data;
- a conversion unit configured to convert the first photometric value into a second photometric value corresponding to the image data before the compression;
- an exposure control unit configured to perform exposure control based on the second photometric value;
- and
- an image capturing unit configured to capture an object image under exposure control by said exposure control unit.
A control method of an exposure control apparatus including an acquisition unit including a plurality of pixels that are arranged two-dimensionally, and configured to acquire image data, comprising:
- compressing the image data and generating compressed data;
- calculating a first photometric value based on the compressed data;
- converting the first photometric value into a second photometric value corresponding to the image data before the compression;
- and
- performing exposure control based on the second photometric value.
A computer-readable storage medium storing a program that causes a computer to execute each step of a control method of an exposure control apparatus including an acquisition unit including a plurality of pixels that are arranged two-dimensionally, and configured to acquire image data, the control method comprising:
- compressing the image data and generating compressed data;
- calculating a first photometric value based on the compressed data;
- converting the first photometric value into a second photometric value corresponding to the image data before the compression;
- and
- performing exposure control based on the second photometric value.
Dependencies are inferred from the claim text.