Methods and apparatus for embedding and recovering an image for use with video content
View Patent ↗Methods and apparatus for embedding and recovering an image for use with video content are disclosed. An example apparatus includes an image processing module to embed a real component of a spectral representation of the image data into a first set of video frames from the plurality of video frames and embed an imaginary component of the spectral representation of the image data into a second set of video frames from the plurality of video frames.
1. An apparatus to embed image data within a plurality of video frames comprising:
an image processing module to use a processor to:
embed a real component of a spectral representation of the image data into a first set of video frames from the plurality of video frames; and
embed an imaginary component of the spectral representation of the image data into a second set of video frames from the plurality of video frames.
2. An apparatus as defined in claim 1 , wherein the image processing module is to:
combine the first set of video frames from the plurality of video frames with the second set of video frames from the plurality of video frames to form a third set of video frames from the plurality of video frames.
3. An apparatus as defined in claim 1 , further comprising:
a random phase angle generator to associate at least one random phase angle from a plurality of random phase angles to each pixel in the image data to form randomized image data;
a Fourier transform module to apply a two-dimensional Fourier transform to the randomized image data to form a spectral representation of the randomized image data; and
a video broadcast module to transmit the third set of video frames from the plurality of video frames.
4. An apparatus as defined in claim 1 , wherein the image processing module is to condition the spectral representation of the image data.
5. An apparatus as defined in claim 4 , wherein the image processing module is to condition the spectral representation of the image data using at least one of a scaling operation, a normalizing operation, and a quantizing operation.
6. An apparatus as defined in claim 1 , wherein the image processing module is to embed the real component of the spectral representation of the image data in the first set of video frames using at least one of an addition operation and a subtraction operation.
7. An apparatus as defined in claim 1 , wherein the image processing module is to embed the imaginary component of the spectral representation of the image data in the second set of video frames using at least one of an addition operation and a subtraction operation.
8. An apparatus to recover image data from a plurality of video frames comprising:
a image recovery module to use a processor to:
recover a real component of a spectral representation of the image data from a first set of video frames from the plurality of video frames;
recover an imaginary component of the spectral representation of the image data from a second set of video frames from the plurality of video frames; and
recover the image data based on the real component of the spectral representation of the image data and the imaginary component of the spectral representation of the image data.
9. An apparatus as defined in claim 8 , wherein the image recovery module is to:
store video frames in a video frame buffer;
form the plurality of video frames from the video frames within the video frame buffer.
separate the plurality of video frames into the first set of video frames and the second set of video frames.
10. An apparatus as defined in claim 8 , wherein the image processing module is to recover the real component of the spectral representation of the image data from the first set of video frames by calculating a difference between two video frames from the first set of video frames.
11. An apparatus as defined in claim 8 , wherein the image processing module is to recover the imaginary component of the spectral representation of the image data from the second set of video frames by calculating a difference between two video frames from the second set of video frames.
12. An apparatus as defined in claim 8 , wherein the image recovery module is to combine the real component of the spectral representation of the image data with the imaginary component of the spectral representation of the image data to form the spectral representation of the image data.
13. An apparatus as defined in claim 8 , further comprising:
a video receiver to receive the plurality of video frames; and
an inverse Fourier transform module to transform the spectral representation of the image data to form the image data.
14. An apparatus as defined in claim 13 , further comprising a validity testing module to determine the validity of the image data.
15. A tangible computer readable medium having instructions stored thereon that, when executed, cause a machine to:
embed a real component of a spectral representation of image data into a first set of video frames from a plurality of video frames to form a modified first set of video frames; and
embed an imaginary component of the spectral representation of the image data into a second set of video frames from the plurality of video frames to form a modified second set of video frames.
16. A tangible computer readable medium as defined in claim 15 having instructions stored thereon that, when executed, cause the machine to:
associate at least one random phase angle from a plurality of random phase angles to each pixel of at least a portion of the image data to form randomized image data;
apply a two-dimensional Fourier transform to the randomized image data to form a spectral representation of the randomized image data; and
separate the plurality of video frames into the first set of video frames and the second set of video frames.
17. A tangible computer readable medium as defined in claim 16 having instructions stored thereon that, when executed, cause the machine to condition the spectral representation of the randomized image data.
18. A tangible computer readable medium as defined in claim 15 having instructions stored thereon that, when executed, cause the machine to embed the real component of the spectral representation of the image data into the first set of video frames using at least one of an addition operation and a subtraction operation.
19. A tangible computer readable medium as defined in claim 15 having instructions stored thereon that, when executed, cause the machine to embed the imaginary component of the spectral representation of the image data into the second set of video frames using at least one of an addition operation and a subtraction operation.
20. A tangible computer readable medium as defined in claim 15 having instructions stored thereon that, when executed, cause the machine to:
combine the modified first set of video frames and the modified second set of video frames to form the third set of video frames from the plurality of video frames; and
broadcast the third set of video frames.
21. A tangible computer readable medium having instructions stored thereon that, when executed, cause a machine to:
recover a real component of a spectral representation of the image data from a first set of video frames from the plurality of video frames;
recover an imaginary component of the spectral representation of the image data from a second set of video frames from the plurality of video frames; and
recover the image data based on the real component of the spectral representation of the image data and the imaginary component of the spectral representation of the image data.
22. A tangible computer readable medium as defined in claim 21 having instructions stored thereon that, when executed, cause the machine to recover the real component of the spectral representation of the image data from first set of video frames by calculating a difference between two video frames from the first set of video frames.
23. A tangible computer readable medium as defined in claim 21 having instructions stored thereon that, when executed, cause the machine to recover the imaginary component of the spectral representation of the image data from the second set of video frames by calculating a difference between of two video frames from the second set of video frames.
24. A tangible computer readable medium as defined in claim 21 having instructions stored thereon that, when executed, cause the machine to:
combine the real component of the spectral representation of the image data with the imaginary component of the spectral representation of the image data to form a spectral representation of the image data; and
apply an inverse Fourier transform to the spectral representation of the image data to form the image data.
25. A tangible computer readable medium as defined in claim 21 having instructions stored thereon that, when executed, cause the machine to:
separate the plurality of video frames into the first set of video frames and the second set of video frames.
26. A tangible computer readable medium as defined in claim 21 having instructions stored thereon that, when executed, cause the machine to:
receive a video frame;
store the video frame in a video frame buffer until at least four video frames have been buffered;
form the plurality of video frames from the video frames within the video frame buffer; and
remove an oldest video frame from the video frame buffer.
27. A tangible computer readable medium as defined in claim 26 having instructions stored thereon that, when executed, cause the machine to test the validity of the recovered image data.