System and method for image capture device

1. A focus system that focuses an image capture device lens, comprising:

a first photodetector array configured to capture a first image of a portion of an object that is to be captured through the image capture device lens when an image is focused onto an image capture medium by the image capture device lens;

a first lens configured to focus the object portion onto the first photodetector array;

a second photodetector array configured to capture a second image of the object portion concurrently with the capture of the first image of the object portion;

a second lens configured to focus the object portion onto the second photodetector array; and

a processor that performs operations comprising receiving data corresponding to the first image and second image concurrently, and determining image focus information corresponding to the determined difference in position of the object portion between the concurrently captured first image and second image such that the image is focused on the image capture medium by the image capture device lens, wherein in the determining the processor performs operations comprising

determining a plurality of points of contrast in the first image and the second image;

determining a corresponding plurality of distances, each distance being determined from respective points of contrast in the first image and the second image and corresponding to a difference in position of the object portion;

correlating the plurality of distances; and

determining an amount of focus compensation corresponding to the determined distance in position from the correlated plurality of distances.

2. The focus system of claim 1 , wherein the processor is further configured to determine at least a point of contrast in the concurrently captured first image and second image such that the determined difference in position is based upon a change in position of the points of contrast.

3. The focus system of claim 1 , wherein the processor is further configured to perform correlation on data from the concurrently captured first image and second image such that the determined difference in position is based upon the correlation.

4. The focus system of claim 1 , wherein the processor, the first photodetector array and the second photodetector array are fabricated onto a silicon chip, and wherein the processor communicates the image focus information to another processor that generates an autofocus control signal.

5. A focus system that focuses an image capture device lens, comprising:

a first photodetector array configured to capture a first image of a portion of an object that is to be captured through the image capture device lens when an image is focused onto an image capture medium by the image capture device lens;

a first lens configured to focus the object portion onto the first photodetector array;

a second photodetector array configured to capture a second image of the object portion concurrently with the capture of the first image of the object portion;

a second lens separate from the first lens and configured to focus the object portion onto the second photodetector array, such that a processor receives data corresponding to the first image and second image concurrently, and determines image focus information corresponding to the determined difference in position of the object portion between the concurrently captured first image and second image such that the image is focused on the image capture medium by the image capture device lens; and

a folding prism that receives light from the first lens and communicates the light to the first photodetector array, and that receives light from the second lens and communicates the light to the second photodetector array.

6. A method for focusing a camera lens during image capture, the method comprising:

capturing a first image of a portion of an object at a first time, wherein the object portion corresponds to an object of interest that is to be captured by an image capture device through an image capture device lens;

capturing a second image of the object portion concurrently with the capture of the first image of the objection portion;

determining plurality of points of contrast in the first image and the second image;

determining a corresponding plurality of distances, each distance being determined from respective points of contrast in the first image and the second image and corresponding to a difference in position of the object portion;

correlating the plurality of distances; and

determining an amount of focus compensation corresponding to the determined distance in position from the correlated plurality of distances.

7. The method of claim 6 , wherein determining the distance further comprises correlating the first image and the second image.

8. The method of claim 6 , further comprising:

generating a focus adjustment signal; and

adjusting focus of the image capture device lens in response to the focus adjustment signal.