Methods and systems for embedding camera information in images
View Patent ↗The present invention is related to providing, in association with an image, information related to the image capture device used to capture the image. In one embodiment, information related to a first static camera characteristic and camera setting information related to a first captured digitized image is embedded in the first captured digitized image using a watermark. The watermarked information may be used to identify the source or owner of the picture, and/or to aid in the more accurate reproduction of the image.
1. A method comprising:
extracting information from a watermark in an image, wherein the information identifies a static characteristic associated with a camera used to capture the image; and
enhancing the image with a gamma correction algorithm selected based, at least in part, on the static characteristic associated with the camera.
2. The method of claim 1 , wherein the enhancing of the image is based, at least in part, on a characteristic of a reproduction device used to generate a reproduction of the image.
3. The method of claim 1 , wherein the information that identifies the static characteristic associated with the camera includes a pointer into a gamma correction lookup table.
4. The method of claim 3 , wherein the lookup table is stored external to the camera.
5. The method of claim 1 , wherein the static characteristic associated with the camera includes at least one of a type of image sensors, a frequency response of the image sensors, color cross-talk information corresponding to the image sensors, pixel gains corresponding to the image sensors, pixel offsets corresponding to the image sensors, color information corresponding to the image sensors, or a type of color filter corresponding to the image sensors.
6. The method of claim 1 , further comprising decrypting the watermark utilizing at least a portion of the information corresponding to the static characteristic associated with the camera.
7. The method of claim 6 , wherein the information associated with the camera corresponds to a measurement of dark current in the camera.
8. The method of claim 6 , wherein the information corresponding to the static characteristic associated with the camera is related to a number of bad pixels included in the camera.
9. A method comprising:
extracting a static characteristic from an image, wherein the static characteristic is associated with a camera used to capture the image;
selecting a gamma correction algorithm from multiple gamma correction algorithms based, at least in part, on the static characteristic associated with the camera and information relating to a gamma of a targeted reproduction device; and
enhancing a reproduction of the image made by the targeted reproduction device with the selected gamma correction algorithm.
10. The method of claim 9 , wherein the static characteristic includes a pointer into a gamma correction lookup table populated with gamma correction information.
11. The method of claim 10 , wherein selecting the gamma correction algorithm is based on gamma correction information identified by the pointer into the gamma correction lookup table and based on characteristics of the targeted reproduction device.
12. The method of claim 9 , wherein extracting the static characteristic further comprises decrypting the static characteristic from a watermark in the image utilizing a key corresponding to at least one static characteristic of the camera.
13. The method of claim 12 , wherein the key corresponds to at least one of a measurement of dark current in the camera or a number of bad pixels included in the camera.
14. The method of claim 9 , wherein the static characteristic associated with the camera includes at least one of a type of image sensors, a frequency response of the image sensors, color cross-talk information corresponding to the image sensors, pixel gains corresponding to the image sensors, pixel offsets corresponding to the image sensors, color information corresponding to the image sensors, or a type of color filter corresponding to the image sensors.
15. A device comprising:
an extraction device configured to extract information from a watermark in an image, wherein the information identifies a static characteristic associated with a camera used to capture the image; and
an imaging device configured to enhance the image with a gamma correction algorithm selected based, at least in part, on the static characteristic associated with the camera.
16. The device of claim 15 , wherein the imaging device is configured to enhance the image based, at least in part, on a characteristic of a reproduction device used to generate a reproduction of the image.
17. The device of claim 15 , wherein the information that identifies the static characteristic associated with the camera includes a pointer into a gamma correction lookup table populated with gamma correction information.
18. The device of claim 17 , wherein the imaging device is configured to select the gamma correction algorithm based on gamma correction information identified by the pointer into the gamma correction lookup table and based on a characteristic of a reproduction device used to generate a reproduction of the image, and configured to enhance the image based on the selected gamma correction algorithm.
19. The device of claim 15 , wherein the static characteristic associated with the camera includes at least one of a type of image sensors, a frequency response of the image sensors, color cross-talk information corresponding to the image sensors, pixel gains corresponding to the image sensors, pixel offsets corresponding to the image sensors, color information corresponding to the image sensors, or a type of color filter corresponding to the image sensors.
20. The device of claim 15 , wherein the imaging device is configured to decode the static characteristic from the watermark in the image utilizing a key corresponding to at least one of a measurement of dark current in the camera or a number of bad pixels included in the camera.