Detecting encoded signals under adverse lighting conditions using adaptive signal detection

• US 10,497,081 B2
• Filed: 04/09/2018
• Issued: 12/03/2019
• Est. Priority Date: 06/23/2010
• Status: Active Grant

• Current Assignee: Digimarc Corporation
• Original Assignee: Digimarc Corporation
• Inventors: Reed, Alastair M., Bradley, Brett A.
• Primary Examiner(s): Cumming, William D
• Application Number:
  US15/948,956
• Publication Number:
  US 20190108607A1
• Time in Patent Office: 603 Days
• Field of Search: 4554461, 3482221, 382100, 382103, 382106, 382269
• CPC Class Codes: G06T 1/0021 Image watermarking
• CPC Class Codes: G06T 2201/0065 Extraction of an embedded watermark; Reliable detection
• CPC Class Codes: H04N 23/60 Control of cameras or camera modules
• CPC Class Codes: H04N 23/71 Circuitry for evaluating the brightness variation
• CPC Class Codes: H04N 23/74 by influencing the scene brightness using illuminating means

Abstract

Signal detection adaptable to accommodate various lighting conditions, and to detect embedded signals according to anticipated lighting conditions likely to be present during image capture. A portable apparatus comprising: a camera for capturing data representing imagery or video; a touchscreen display; means for communicating and receiving data; means for obtaining data representing imagery or video, the imagery or video having been captured with said camera; means for obtaining lighting information associated with image capture of the imagery or video, in which the lighting information is associated with a light level or color temperature; and means for processing the data representing imagery or video to determine whether a signal is encoded therein, in which said means for processing utilizes obtained lighting information to determine whether the signal is encoded in the data representing imagery or video. Additional disclosure, combinations and claims are also provided.

Claims

1. A non-transitory computer readable medium comprising instructions stored thereon that when executed by one or more processors, cause a portable device comprising a camera for capturing data representing imagery or video, a radio frequency (RF) transceiver, a touchscreen display, a graphical user interface for providing a user interface on the touchscreen display, to perform the following:

obtain data representing imagery or video provided by the camera;

obtain lighting information via the graphical user interface, the lighting information associated with the captured data representing imagery or video;

adapt an encoded signal detector based on the lighting information, in which the adapted encoded signal detector is configured to detect whether a signal is encoded within the data representing imagery or video.

2. The non-transitory computer readable medium of claim 1 in which the adapt instructions comprise instructions that apply different weightings to different color channels of the data representing imagery or video for detection, the different weightings being associated with the lighting information.

3. The non-transitory computer readable medium of claim 2 in which the lighting information is associated with incandescent lighting, and the weightings deemphasize a blue color channel.

4. The non-transitory computer readable medium of claim 3 in which the blue color channel is deemphasized to the point of not being used in detecting the encoded signal.

5. The non-transitory computer readable medium of claim 2 in which the lighting information is associated with daylight or cool white fluorescent lighting, and the weightings are applied across red, green and blue channels.

6. The non-transitory computer readable medium of claim 1 in which the adapted encoded signal detector operates on a grayscale representation of the data representing imagery or video.

7. The non-transitory computer readable medium of claim 1 in which the encoded signal detector comprises a digital watermark detector.

8. A portable apparatus comprising:

a camera for capturing data representing imagery or video;

a touchscreen display;

means for communicating and receiving data;

means for obtaining data representing imagery or video, the data representing imagery or video having been captured with said camera;

means for obtaining lighting information associated with image capture of the data representing imagery or video, in which the lighting information is associated with a light level or color temperature; and

means for processing the data representing imagery or video to determine whether a signal is encoded therein, in which said means for processing utilizes obtained lighting information to determine whether the signal is encoded in the data representing imagery or video.

9. The portable apparatus of claim 8 in which the lighting information is associated with the light level and the color temperature.

10. The portable apparatus of claim 8 in which the color temperature is associated with incandescent lighting.

11. The portable apparatus of claim 9 in which the color temperature is associated with incandescent lighting.

12. The portable device of claim 8 in which the data representing imagery or video comprises a plurality of color channels including at least a blue channel, and in which the blue channel is deemphasized by said means for processing.

13. The portable device of claim 9 in which the data representing imagery or video comprises a plurality of color channels including at least a blue channel, and in which the blue channel is deemphasized by said means for processing.

14. The portable apparatus of claim 8 in which the color temperature is associated with daylight or cool white fluorescent lighting.

15. The portable apparatus of claim 8 in which said means for processing processes a grayscale representation of the data.

16. The portable apparatus of claim 8 in which the data representing imagery or video comprises two color channels, in which the signal comprises a watermark signal, with the watermark signal embedded in a first color channel, and the watermark signal embedded in a second color channel with a signal polarity that is inversely related to a signal polarity of the watermark signal in the first color channel.

17. The portable apparatus of claim 8 in which the portable apparatus comprises a cell phone.

18. A portable apparatus comprising:

a camera for capturing data representing imagery or video;

a touchscreen display;

a radio frequency (RF) transceiver for transmitting and receiving data;

means for obtaining lighting information associated with capturing of the data representing imagery or video by said camera;

means for extracting fingerprint information from the data representing imagery or video, in which said means for extracting utilizes obtained lighting information.

19. The portable apparatus of claim 18 in which said means for extracting applies different weightings to different color channels of the data representing imagery or video, the different weightings being associated with the obtained lighting information, and in which the weightings deemphasize the blue color channel.

20. The portable apparatus of claim 18 in which the obtained lighting information is associated with incandescent lighting.