Cross-talk adjustment in electronic imaging devices

1. A system for reducing cross-talk in a photosensor, comprising:

a first photodetector;

a plurality of adjacent photodetectors adjacent to the first photodetector;

a cross-talk adjustment device in signal communication with the first photodetector and the plurality of adjacent photodetectors;

wherein the cross-talk adjustment device is operable to generate a cross-talk adjusted value from the first photodetector based upon signals from the plurality of adjacent photodetectors, and wherein the cross-talk adjusted value is determined by determining a cross-talk gain factor, determining a cross-talk gain adjusted value, determining a cross-talk loss normalization factor, and normalizing the cross-talk gain adjusted value by the cross-talk loss normalization factor.

2. The system of claim 1 wherein the plurality of photodetectors are positioned in an array structure.

3. The system of claim 1 wherein the cross-talk adjustment device is operable to cross-talk adjust the signal from the first photodetector based upon a percentage of photo-charges that leak from one of the plurality of adjacent photodetectors in a horizontal direction.

4. The system of claim 1 wherein the cross-talk adjustment device is operable to cross-talk adjust the signal from the first photodetector based upon a percentage of photo-charges that leak from one of the plurality of adjacent photodetectors in a vertical direction.

5. The system of claim 1 wherein the cross-talk adjustment device is operable to cross-talk adjust the signal from the first photodetector based upon a percentage of photo-charges that leak from one of the plurality of adjacent photodetectors in a diagonal direction.

6. The system of claim 1 further comprising a filter associated with each photodetector, wherein each filter is operable to filter out light and allow only one color of light to be received by its respective photo detector.

7. A method for adjusting cross-talk in a first photodetector signal from a first photodetector, comprising:

measuring a first value of the first photodetector signal;

measuring a plurality of adjacent values of a plurality of adjacent photodetector signals from a plurality of photodetectors adjacent to the first photodetector; and

generating a cross-talk adjusted value of the first photodetector signal based upon the first value and the plurality of adjacent values;

wherein the cross-talk adjusted value is determined by determining a cross-talk gain factor, determining a cross-talk gain adjusted value, determining a cross-talk loss normalization factor, and normalizing the cross-talk gain adjusted value by the cross-talk loss normalization factor.

8. The method of claim 7 , wherein determining the cross-talk gain factor comprises:

determining a horizontal cross-talk gain interference value;

determining a vertical cross-talk gain interference value; and

determining a diagonal cross-talk gain interference value.

9. The method of claim 8 , wherein the horizontal cross-talk gain interference value is determined by multiplying the percentage of photocharges from photodetectors sensing a color of light that the first photodetector senses that travel in a horizontal direction, by the measured values of photodetectors positioned horizontally with respect to the first photodetector.

10. The method of claim 8 , wherein the vertical cross-talk gain interference value is determined by multiplying the percentage of photocharges from photodetectors sensing a color of light that the first photodetector senses that travel in a vertical direction, by the measured values of photodetectors positioned vertically with respect to the first photodetector.

11. The method of claim 8 , wherein the diagonal cross-talk gain interference value is determined by multiplying the percentage of photocharges from photodetectors sensing a color of light that the first photodetector senses that travel in a diagonal direction, by the measured values of photodetectors positioned diagonally with respect to the first photodetector.

12. The method of claim 8 , wherein determining the cross-talk gain factor further comprises determining a cumulative cross-talk gain interference value.

13. The method of claim 12 , wherein the cumulative cross-talk gain interference value is determined by adding the horizontal cross-talk gain interference value, the vertical cross-talk gain interference value and the diagonal cross-talk gain interference value.

14. The method of claim 7 wherein the cross-talk gain adjusted value is determined by subtracting the cross-talk gain factor from the first value.

15. The method of claim 7 , wherein the cross-talk loss normalization factor is determined by:

determining a cumulative cross-talk loss factor; and

subtracting the cumulative cross-talk loss factor from 1.

16. The method of claim 15 , wherein determining the cumulative cross-talk loss factor comprises:

determining a horizontal cross-talk loss factor;

determining a vertical cross-talk loss factor; and

determining a diagonal cross-talk loss factor.

17. The method of claim 16 , wherein the cumulative cross-talk loss factor is determined by adding the horizontal cross-talk loss factor, the vertical cross-talk loss factor and the diagonal cross-talk loss factor.

18. The method of claim 16 , wherein the horizontal cross-talk loss factor is twice the value of the percentage of photocharges from photodetectors sensing a color of light that the first photodetector senses that travel in a horizontal direction.

19. The method of claim 17 , wherein the vertical cross-talk loss factor is twice the value of the percentage of photocharges from photodetectors sensing a color of light that the first photodetector senses that travel in a vertical direction.

20. The method of claim 17 , wherein the diagonal cross-talk loss factor is four times the value of the percentage of photocharges from photo detectors sensing a color of light that the first photodetector senses that travel in a diagonal direction.

21. The method of claim 7 , wherein normalizing the cross-talk gain adjusted value by the cross-talk loss normalization factor comprises dividing the cross-talk gain adjusted value by the cross-talk loss normalization factor.

22. A computer readable medium having encoded thereon software for execution by a processor to perform a method for adjusting a first value of a first signal from a first photodetector for cross-talk from a plurality of adjacent photodetectors adjacent to the first photodetector, the method comprising:

measuring the first value or the first signal from the first photodetector;

measuring values of a plurality of adjacent signals from the plurality of adjacent photo detectors;

generating a cross-talk adjusted value of the first signal based on the first value and at least one of the plurality of adjacent signals;

wherein the cross-talk adjusted value is determined by determining a cross-talk gain factor, determining a cross-talk gain adjusted value, determining a cross-talk loss normalization factor, and normalizing the cross-talk gain adjusted value by the cross-talk loss normalization factor.

23. The computer readable medium of claim 22 , wherein the determining the cross-talk gain factor comprises:

determining a horizontal cross-talk gain interference value;

determining a vertical cross-talk gain interference value; and

determining a diagonal cross-talk gain interference value.

24. The computer readable medium of claim 23 , wherein the determining the horizontal cross-talk gain interference value comprises multiplying the percentage of photocharges from photodetectors sensing a color of light that the first photodetector senses that travel in a horizontal direction, by the measured values of photodetectors positioned horizontally with respect to the first photodetector.

25. The computer readable medium of claim 23 , wherein the determining the vertical cross-talk gain interference value comprises multiplying the percentage of photocharges from photodetectors sensing a color of light that the first photodetector senses that travel in a vertical direction, by the measured values of photodetectors positioned vertically with respect to the first photodetector.

26. The computer readable medium of claim 23 , wherein the determining the diagonal cross-talk gain interference value comprises multiplying the percentage of photocharges from photodetectors sensing a color of light that the first photodetector senses that travel in a diagonal direction, by the measured values of photodetectors positioned diagonally with respect to the first photodetector.

27. The computer readable medium of claim 23 , wherein the determining the cross-talk gain factor further comprises determining a cumulative cross-talk gain interference value.

28. The computer readable medium of claim 27 , wherein the determining the cumulative cross-talk gain interference value comprises adding the horizontal cross-talk gain interference value, the vertical cross-talk gain interference value and the diagonal cross-talk gain interference value.

29. The computer readable medium of claim 22 , wherein the determining the cross-talk gain adjusted value comprises subtracting the cross-talk gain factor value from the first value.

30. The computer readable medium of claim 22 , wherein the determining the cross-talk loss normalization factor comprises:

determining a cumulative cross-talk loss factor; and

subtracting the cumulative cross-talk loss factor from 1.

31. The computer readable medium of claim 30 , wherein determining the cumulative cross-talk loss factor comprises:

determining a horizontal cross-talk loss factor;

determining a vertical cross-talk loss factor; and

determining a diagonal cross-talk loss factor.

32. The computer readable medium of claim 31 , wherein the determining the cumulative cross-talk loss factor comprises adding the horizontal cross-talk loss factor, the vertical cross-talk loss factor and the diagonal cross-talk loss factor.

33. The computer readable medium of claim 32 , wherein the determining the horizontal cross-talk loss factor comprises multiplying by two the value of the percentage of photo charges from photodetectors sensing a color of light that the first photodetector senses that travel in a horizontal direction.

34. The computer readable medium of claim 32 , wherein the determining the vertical cross-talk loss factor comprises multiplying by two the value of the percentage of photocharges from photodetectors sensing a color of light that the first photodetector senses that travel in a vertical direction.

35. The computer readable medium of claim 32 , wherein the determining the diagonal cross-talk loss factor comprises multiplying by four the value of the percentage of photo charges from photodetectors sensing a color of light that the first photodetector senses that travel in a diagonal direction.

36. The computer readable medium of claim 22 , wherein the normalizing the cross-talk gain adjusted value by the cross-talk loss normalization factor comprises dividing the cross-talk gain adjusted value by the cross-talk loss normalization factor.

37. A device comprising:

a first photodetector generating a first signal;

a plurality of second photodetectors, each of the plurality of second photodetectors generating a second signal, each of the plurality of second photodetectors being adjacent to the first photodetector;

a processor configured to measure a first value from the first signal and a second value from each second signal and to generate a cross-talk adjusted value for the first photodetector based on the first value and the second values, wherein the processor generates the cross-talk adjusted value by determining a cross-talk gain factor, a cross-talk gain adjusted value and a cross-talk loss normalization factor, and by normalizing the cross-talk gain adjusted value by the cross-talk loss normalization factor.

38. The device of claim 37 , wherein the processor determines the cross-talk gain factor by determining a horizontal cross-talk gain interference value, a vertical cross-talk gain interference value and a diagonal cross-talk gain interference value.

39. The device of claim 38 , wherein the processor determines the horizontal cross-talk gain interference value by multiplying the percentage of photocharges from the plurality of second photodetectors sensing a color of light that the first photodetector senses that travel in a horizontal direction, by the measured values of the plurality of second photodetectors positioned horizontally with respect to the first photodetector.

40. The device of claim 38 , wherein the processor determines the vertical cross-talk gain interference value by multiplying the percentage of photocharges from the plurality of second photodetectors sensing a color of light that the first photodetector senses that travel in a vertical direction, by the measured values of the plurality of second photodetectors positioned vertically with respect to the first photodetector.

41. The device of claim 38 , wherein, the processor determines the diagonal cross-talk gain interference value by multiplying the percentage of photocharges from the plurality of second photodetectors sensing a color of light that the first photodetector senses that travel in a diagonal direction, by the measured values of the plurality of second photodetectors positioned diagonally with respect to the first photodetector.

42. The device of claim 38 , wherein the processor determines the cross-talk gain factor using a cumulative cross-talk gain interference value.

43. The device of claim 42 , wherein the processor determine the cumulative cross-talk gain interference value by adding the horizontal cross-talk gain interference value, the vertical cross-talk gain interference value and the diagonal cross-talk gain interference value.