Image color correction systems and methods

1. A method comprising:

receiving an image;

determining, based at least on the image, a first scaling value and a second scaling value;

applying the first scaling value to the image to obtain a scaled image;

applying a color correction matrix (CCM) to the scaled image to obtain a CCM image; and

applying the second scaling value to the CCM image to obtain a color corrected image.

2. The method of claim 1 , wherein the CCM comprises a polynomial CCM.

3. The method of claim 1 , wherein the second scaling value is an inverse of the first scaling value.

4. The method of claim 1 , further comprising:

obtaining a correlated color temperature associated with the image; and

obtaining the CCM based on the correlated color temperature.

5. The method of claim 1 , wherein the first scaling value is based on a relative luminance associated with the image and a relative luminance associated with a calibration image.

6. The method of claim 1 , further comprising capturing, by an image sensor device, the image, wherein the image comprises a visible-light image, and providing the color corrected image for display and/or storage.

7. A method comprising:

receiving an image;

obtaining a correlated color temperature associated with the image, wherein the obtaining the correlated color temperature comprises:

determining histogram data based on the image;

determining chromaticity coordinates associated with the image based on the histogram data; and

determining the correlated color temperature based at least on the chromaticity coordinates;

obtaining a color correction matrix (CCM) based on the correlated color temperature; and

generating a color corrected image based on the CCM.

8. The method of claim 7 , further comprising determining, based at least on the image, a first scaling value and a second scaling value, wherein the color corrected image is further based on the first scaling value and the second scaling value.

9. The method of claim 7 , further comprising:

receiving a second image;

obtaining a second correlated color temperature associated with the second image, wherein the obtaining the second correlated color temperature comprises receiving user input indicative of the second correlated color temperature;

obtaining a second CCM based on the second correlated color temperature; and

generating a second color corrected image based on the second CCM.

10. The method of claim 7 , wherein the obtaining the CCM comprises retrieving, from a memory and based on the correlated color temperature, the CCM from among a plurality of predetermined CCMs stored in the memory, and wherein each of the plurality of predetermined CCMs is associated with a respective correlated color temperature.

11. The method of claim 7 , further comprising determining a spectral power distribution based at least on the correlated color temperature, wherein the CCM is based on the spectral power distribution.

12. The method of claim 7 , further comprising:

determining whether a correction matrix associated with the correlated color temperature is stored in a memory;

when a correction matrix associated with the correlated color temperature is determined to be stored, retrieving, from the memory, the CCM; and

when a correction matrix associated with the correlated color temperature is determined not to be stored:

determining a spectral power distribution based at least on the correlated color temperature, wherein the CCM is determined based on the spectral power distribution; and

storing the CCM in the memory.

13. A system comprising:

a processing circuit configured to:

receive an image;

determine, based at least on the image, a first scaling value and a second scaling value;

apply the first scaling value to the image to obtain a scaled image;

apply a color correction matrix (CCM) to the scaled image to obtain a CCM image; and

apply the second scaling value to the CCM image to obtain a color corrected image.

14. The system of claim 13 , wherein the CCM comprises a polynomial CCM, wherein the second scaling value is an inverse of the first scaling value, and wherein the processing circuit is further configured to:

obtain a correlated color temperature associated with the image; and

obtain the CCM based on the correlated color temperature.

15. The system of claim 14 , wherein the processing circuit is configured to obtain the correlated color temperature by receiving user input indicative of the correlated color temperature;

and/or wherein the processing circuit is configured to obtain the CCM by retrieving, from a memory and based on the correlated color temperature, the CCM from among a plurality of predetermined CCMs stored in the memory, and wherein each of the plurality of predetermined CCMs is associated with a respective correlated color temperature.

16. The system of claim 14 , wherein:

the processing circuit is further configured to determine a spectral power distribution based at least on the correlated color temperature; and

the processing circuit is configured to determine the CCM based on the spectral power distribution.

17. The system of claim 14 , wherein:

the processing circuit is further configured to determine whether a correction matrix associated with the correlated color temperature is stored in a memory; and

the processing circuit is configured to:

when a correction matrix associated with the correlated color temperature is determined to be stored, retrieve the CCM from the memory; and

when a correction matrix associated with the correlated color temperature is determined not to be stored:

determine a spectral power distribution based at least on the correlated color temperature;

determine the CCM based on the spectral power distribution; and

store the CCM in the memory.

18. The system of claim 13 , further comprising an image sensor device configured to store the image, and wherein the first scaling value is based on a relative luminance associated with the image and a relative luminance associated with a calibration image.

19. The system of claim 13 , wherein the image comprises a visible-light image, wherein the processing circuit is further configured to provide the color corrected image for display and/or storage.

20. The system of claim 14 , wherein the processing circuit is configured to obtain the correlated color temperature by:

determining chromaticity coordinates associated with the image; and

determining the correlated color temperature based at least on the chromaticity coordinates.