Digital watermarking in data representing color channels

1. A method comprising:

receiving captured imagery of media, wherein the captured imagery includes a plurality of image frames;

for a first image frame, applying, using an electronic processor, a first watermark detector to search for a first imperceptible digital watermark hidden within the first image frame, wherein the first watermark detector uses a blue phase technique to search for the first imperceptible digital watermark, wherein the first image frame represents a blue channel, a green channel, and a red channel, wherein the first watermark detector uses a detection signal to search for the first imperceptible digital watermark, and wherein the detection signal is calculated using the blue channel, green channel, and the red channel;

for a second image frame, applying, using the electronic processor, a second, different watermark detector to search for a second, different imperceptible watermark hidden within the second image frame;

scaling the blue channel by a first factor;

scaling a sum of the red channel and the green channel by a second factor; and

subtracting the scaled sum of the red channel and green channel from the scaled blue channel as part of the detection signal.

2. The method of claim 1 , wherein the first image frame and the second image frame each represent a same portion of the media.

3. The method of claim 1 , wherein the second image frame is different than the first image frame.

4. The method of claim 1 , wherein first factor is different than the second factor.

5. The method of claim 4 , further comprising shifting the detection signal by a value to avoid color saturation.

6. The method of claim 1 , wherein the first factor is greater than the second factor.

7. The method of claim 1 , wherein the second imperceptible watermark is an orientation component.

8. A system comprising:

an electronic processor configured to:

receive captured imagery of media, wherein the captured imagery includes a plurality of image frames;

for a first image frame, apply a first watermark detector to search for a first digital imperceptible watermark hidden within the first image frame, wherein the first watermark detector uses a blue phase technique to search for the first imperceptible digital watermark wherein the first image frame represents a blue channel, a green channel, and a red channel, wherein the first watermark detector uses a detection signal to search for the first imperceptible digital watermark, and wherein the detection signal is calculated using the blue channel, green channel, and the red channel;

for a second image frame, apply a second, different watermark detector to search for a second, different imperceptible watermark hidden within the second image frame;

scale the blue channel by a first factor;

scale a sum of the red channel and the green channel by a second factor; and

subtract the scaled sum of the red channel and green channel from the scaled blue channel as part of the detection signal.

9. The system of claim 8 , wherein the electronic processor is further configured to shift the detection signal by a value to avoid color saturation.

10. The system of claim 9 , wherein first factor is different than the second factor.

11. A non-transitory computer readable medium having instructions stored thereon, the instructions comprising:

instructions to receive captured imagery of media, wherein the captured imagery includes a plurality of image frames;

instructions to, for a first image frame, apply a first watermark detector to search for a first digital imperceptible watermark hidden within the first image frame, wherein the first watermark detector uses a blue phase technique to search for the first imperceptible digital watermark, wherein the first image frame represents a blue channel, a green channel, and a red channel, wherein the first watermark detector uses a detection signal to search for the first digital imperceptible watermark, and wherein the detection signal is calculated using the blue channel, green channel, and the red channel;

instructions to, for a second image frame, apply a second, different watermark detector to search for a second, different imperceptible watermark hidden within the second image frame;

instructions to scale the blue channel by a first factor;

instructions to scale a sum of the red channel and the green channel by a second factor; and

instructions to subtract the scaled blue channel from the scaled sum of the red channel and green channel as part of the detection signal.

12. The non-transitory computer readable medium of claim 11 , wherein the instructions further comprise instructions to shift the detection signal by a value to avoid color saturation.