Per-Channel Image Intensity Correction

• US 20090257677A1
• Filed: 04/10/2008
• Published: 10/15/2009
• Est. Priority Date: 04/10/2008
• Status: Active Grant

• Current Assignee: NVIDIA Corporation
• Original Assignee: NVIDIA Corporation
• Inventors: Cabral, Brian, Ing, Elena, Takemoto, Sohei, He, Hu
• Granted Patent: US 9,379,156 B2
• Time in Patent Office: Days
• US Class Current: 382/274
• CPC Class Codes: H01L 27/14627 Microlenses
• CPC Class Codes: H04N 23/81 for suppressing or minimising disturbance in the image signal generation

Abstract

Techniques for per-channel image intensity correction includes linear interpolation of each channel of spectral data to generate corrected spectral data.

Claims

1. A method of performing per channel image intensity correction comprising:

receiving spectral data for a given image;

applying a general two-parameter spline to each channel of the spectral data to generate corrected spectral data for the given image; and

outputting the corrected spectral data for the given image.

2. The method according to claim 1, wherein the general two-parameter spline comprises bi-cubic Bezier interpolation.

3. The method according to claim 1, wherein the general two-parameter spline comprises b-spline interpolation.

4. The method according to claim 1, wherein the general two-parameter spline comprises non-uniform rational b-spline interpolation.

5. The method according to claim 1, wherein the spectral data is distorted due to imperfection in one or more lenses.

6. The method according to claim 1, wherein the spectral data is distorted due to imperfection in one or more image sensor arrays.

7. The method according to claim 1, wherein the spectral data is distorted by chromatic aberration from one or more lenses.

8. The method according to claim 1, wherein the spectral data is distorted by vignetting effects.

9. The method according to claim 1, wherein parameter spline can be aggregated into a plurality of connected 2 parameter splines to form an array of 2 parameter splines.

10. The method according to claim 1, wherein said array of splines an be of any plurality in both the dimensions of the 2 parameter splines.

11. The method according to claim 1, the boundaries of the spline arrays are of arbitrary spacing and orientation and shape.

12. An imaging system comprising:

one or more lenses;

one or more image sensor arrays for measuring spectral data for the given image focused on the one or more image sensor arrays by the one or more lenses;

a general two-parameter spline for generating corrected spectral data for each channel of the spectral data of the given image.

13. The imaging system of claim 12, wherein the one or more image sensor arrays are divided into a plurality of adjustable patches.

14. The imaging system of claim 12, wherein the one or more image sensor arrays comprise a complimentary metal oxide semicondutor (CMOS) device array.

15. The imaging system of claim 12, wherein the one or more image sensor arrays comprise a charge coupled device (CCD) array.

16. The imaging system of claim 12, wherein the image sensor arrays comprise a Bayer sensor array.

17. The imaging system of claim 12, wherein the image sensor arrays comprise a Foveon sensor array.

18. The imaging system of claim 12, wherein the general two-parameter spline comprises a bi-cubic patch array.

19. The imaging system of claim 12, wherein the imaging system includes a digital camera.

20. The imaging system of claim 12, wherein the imaging system includes a digital camcorder.