Digital camera

1. A digital camera comprising:

an imaging device for capturing an image of an object;

a signal processor which performs signal processing on a signal captured by said imaging device to obtain an image signal;

a single measuring device for measuring color of at least a part of the object, and for measuring a color temperature of the object to adjust white balance of said image signal,

an AF controller which measures an object distance of the object and performs AF control upon operation of a focusing lens system of a photographing lens to automatically bring the object into focus;

a controller which makes an adjustment to said AF control based on the color of the object that is measured by said single measuring device; and

a look-up table from which said controller obtains a correction value used for said adjustment to said AF control based on said color of at least a part of the object that is measured by said single measuring device.

2. The digital camera according to claim 1 , further comprising a white balance adjustment device, wherein said white balance adjustment device adjusts a white balance of the image signal captured by said imaging device in accordance with the measured object color temperature of the object.

3. The digital camera according to claim 1 , wherein said AF controller is configured to measure an object distance at least one predetermined point on the object, and

wherein said single measuring device is configured so that a photoreceptive area thereof measures a color of the object at said predetermined point on the object.

4. The digital camera according to claim 1 , wherein said single measuring device comprises:

a photoreceptor, a light receptive surface of said photoreceptor being sectioned into a plurality of light receptive areas; and

an optical plate positioned in front of said photoreceptor,

wherein a portion of said plurality of light receptive areas is configured to measure said color of the object and the remaining portion of said plurality of light receptive areas is configured to measure said color temperature of the object,

wherein a portion of said optical plate which corresponds to said portion of said plurality of light receptive areas is formed as a transparent portion which allows light of the object to pass therethrough, and

wherein a portion of said optical plate which corresponds to said remaining portion of said plurality of light receptive areas is formed as a diffusing portion which diffuses light of the object which is incident thereon.

5. The digital camera according to claim 4 , wherein said single measuring device comprises at least one color filter, positioned to cover said plurality of light receptive areas, for having each of said plurality of light receptive areas receive light of the object spectroscopically.

6. The digital camera according to claim 5 , wherein each of a plurality of portions of said color filter which respectively correspond to said plurality of light receptive areas comprises at least one red-light filter portion, at least one green-light filter portion and at least one blue-light filter portion.

7. The digital camera according to claim 4 , wherein said single measuring device is configured so that said portion of said light receptive area and said transparent portion are arranged to correspond to at least one specific point in said AF controller.

8. The digital camera according to claim 1 , further comprising a photometer configured to obtain exposure settings for capturing images with said imaging device,

wherein said photometer is distinct from said single measuring device.

9. The digital camera according to claim 1 , wherein said photographing lens comprises an interchangeable lens.

10. The digital camera according to claim 1 , wherein said digital camera comprises an SLR digital camera having an image-erecting optical system, said single measuring device being positioned in a vicinity of an exit surface of said image-erecting optical system so that a portion of light which exits out of said exit surface is incident on said single measuring device.

11. The digital camera according to claim 1 , wherein said AF controller comprises an AF sensor unit and an AF driving mechanism including a motor which drives said focusing lens system.

12. The digital camera according to claim 1 , said single measuring device comprising a photoreceptor having a light receptive surface, at least one portion of said light receptive surface being configured to measure said color of the object and at least one remaining portion of said light receptive surface being configured to measure said color temperature of the object.

13. The digital camera according to claim 12 , wherein said single measuring device is configured so that said at least one portion of the said light receptive surface is positioned so as to correspond to at least one specific distance measuring point of said AF controller.

14. The digital camera according to claim 12 , wherein said single measuring device further includes an optical plate positioned in front of said photoreceptor, a portion of said optical plate corresponding to said at least one portion of said light receptive surface being transparent and a portion of said optical plate corresponding to said at least one remaining portion of said light receptive surface comprising a diffuser.

15. The digital camera according to claim 12 , said single measuring device comprising at least one color filter, positioned on said at least one portion of said light receptive surface.

16. The digital camera according to claim 1 , said single measuring device measuring color by measuring color intensities of red, green, and blue light.

17. The digital camera according to claim 1 , said lookup table containing data on correlations between object colors and correction values for correcting distance measurement data obtained by said AF controller.

18. A digital camera including a photographing lens having a focusing lens system, the digital camera comprising:

an imaging device for capturing an image of an object and outputting a signal;

a signal processor configured to perform signal processing of the signal output by the imaging device;

a single measuring device configured to measure a color of at least a part of object, and to measure a color temperature of at least a different part of the object;

a controller configured to adjust white balance of the image signal based upon the measured color temperature of the object;

an AF controller configured to measure an object distance of the object and to perform AF control by operation of the focusing lens system of the photographing lens to automatically bring the object into focus; and

an adjuster configured to perform adjustment of the AF control based upon the measured color of the object.