A camera includes an image sensor, and a plurality of metering areas are assigned to an object scene captured by the image sensor. A CPU evaluates a luminance of the object scene for each metering area, and binarizes each of the plurality of obtained luminance evaluated values. Furthermore, on the basis of the plurality of binarized luminance evaluated values, a width of a high luminance area included in the object scene is calculated while a width of an adjacent area adjacent to the high luminance area out of a low luminance area included in the object scene is calculated. Then, each of the plurality of luminance evaluated values is corrected on the basis of a ratio between the width of the calculated adjacent area and the width of the calculated high luminance area. An exposure amount to the image sensor is adjusted on the basis of the luminance evaluated values thus corrected.
1. A camera, comprising:
an imager which captures an object scene;
an assigner which assigns a plurality of metering areas to said object scene;
an evaluator which evaluates a luminance of said object scene for each metering area;
a classifier which classifies said plurality of metering areas into a high luminance area representing a luminance higher than a first threshold value and a low luminance area representing a luminance lower than said first threshold value on the basis of a plurality of luminance evaluated values obtained by the evaluation processing by said evaluator;
a detector which detects a border between said high luminance area and said low luminance area which are included in said object scene on the basis of a positional relationship between said plurality of metering areas classified by said classifier;
a corrector which corrects each of said plurality of luminance evaluated values obtained by the evaluation processing by said evaluator on the basis of a size of the border detected by said detector;
an adjuster which adjusts an exposure amount on said imager on the basis of the luminance evaluated values corrected by said corrector;
a first calculator which calculates a width of a border area along the border detected by said detector; and
a second calculator which calculates a width of said high luminance area included in said object scene on the basis of said plurality of metering areas classified by said classifier, wherein
said corrector performs a correction on the basis of the width of said border area calculated by said first calculator,
said first calculator calculates a width of an adjacent area adjacent to said high luminance area included in said object scene as the width of said border area out of said low luminance area, and
said corrector performs a correction by noting a relationship between the width of said adjacent area calculated by said first calculator and the width of said high luminance area calculated by said second calculator.
2. A camera according to claim 1 , wherein
said corrector notes a ratio between the width of said adjacent area and the width of said high luminance area.
3. A camera according to claim 1 , wherein
said corrector includes a reducer which reduces the luminance evaluated values above an upper limit out of said plurality of luminance evaluated values obtained by the evaluation processing by said evaluator to said upper limit or approximately said upper limit.
4. A camera according to claim 3 , wherein
said corrector further includes an adjuster which adjusts said upper limit so as to take a value according to a ratio between the width of said adjacent area and the width of said high luminance area.
5. A camera according to claim 4 , further comprising
a third calculator which calculates an average luminance value of said object scene on the basis of said plurality of luminance evaluated values obtained by the evaluation processing by said evaluator, wherein
said adjuster includes a multiplier which multiples the average luminance value calculated by said third calculator by a coefficient changing in correspondence with a ratio between the width of said adjacent area and the width of said high luminance area.
6. A camera according to claim 1 , further comprising
a disabler which disables said corrector when the width of the high luminance area calculated by said second calculator is below a second threshold value.