Spatial data encoding and decoding

1. A method comprising:

identifying a comparison tile within a source frame, the comparison tile including a plurality of available pixels;

identifying at least one bit area within the comparison tile, a particular bit area of the at least one bit area being encoded with at least one message bit, the message bit being associated with a message;

performing a statistical property calculation for a plurality of pixel variable values within the comparison tile;

applying a modulation pattern to at least one bit area of a target frame;

identifying at least one message bit in a target frame in accordance with the performing of the statistical property calculation and the applying of the modulation pattern; and

wherein the applying of the modulation pattern comprises:

accessing the modulation pattern;

calculating an average pattern value for the comparison tile of the frame;

calculating an average pixel variable value for the comparison tile;

applying a matched filter to a pixel variable value of a plurality of pixels in the particular bit area in accordance with the average pattern value and the average pixel variable value to obtain a numeric value, the numeric value capable of being used to identify a particular message bit of the at least one message bit, the matched filtered being in accordance with the modulation pattern.

2. The method of claim 1 , wherein the identifying of the comparison tile comprises:

accessing a decoding key, the decoding key including identification of the comparison tile in the source frame; and

identifying the comparison tile in accordance with the decoding key.

3. The method of claim 1 , further comprising:

selecting the source frame as the target frame.

4. The method of claim 1 , wherein the modulation pattern is a two-dimensional Gaussian function.

5. The method of claim 1 , wherein the modulation pattern is a pseudo-Gaussian function.

6. The method of claim 1 , wherein the message includes at least one of a web site address, identification data, a promotional opportunity, authentication data, non-pictorial data, or combinations thereof.

7. The method of claim 1 , wherein the pixel variable value includes color values.

8. The method of claim 1 , wherein the pixel variable value includes at least one of a blue chrominance, a red chrominance value, or a luminance value.

9. The method of claim 1 , wherein a statistical property calculation is used to obtain a linear combination of two color values.

10. The method of claim 1 , further comprising receiving a digital signal including the source frame.

11. The method of claim 1 , further comprising: decoding an audio signal in the source frame and providing a message using the source frame.

12. A non-transistory machine-readable medium storing instructions, which when implemented by one or more processors perform the following operations:

identify a comparison tile within a source frame, the comparison tile including a plurality of available pixels;

identify at least one bit area within the comparison tile, a particular bit area of the at least one bit area being encoded with at least one message bit, the message bit being associated with a message;

perform a statistical property calculation for a plurality of pixel variable values within the comparison tile;

apply a modulation pattern to at least one bit area of a target frame; and

identify at least one message bit in a target frame in accordance with the performing of the statistical property calculation and the applying of the modulation pattern; and

wherein the one or more instructions to apply the modulation pattern include:

access the modulation pattern;

calculate an average pattern value for the comparison tile of the frame;

calculate an average pixel variable value for the comparison tile; and

apply a matched filter to a pixel variable value of a plurality of pixels in the particular bit area in accordance with the average pattern value and the average pixel variable value to obtain a numeric value, the numeric value capable of being used to identify a particular message bit of the at least one message bit, the matched filtered being in accordance with the modulation pattern.

13. The machine-readable medium of claim 12 , wherein the one or more instructions to apply the modulation pattern include applying a two-dimensional Gaussian function.

14. The machine-readable medium of claim 13 , wherein applying a two-dimensional Gaussian function includes applying the function to at least one of a blue chrominance and a red chrominance value, or both.

15. The machine-readable medium of claim 12 , wherein the one or more instructions to apply the modulation pattern include applying a pseudo-Gaussian function.

16. The machine-readable medium of claim 12 , wherein the pixel variable values include color values.

17. The machine-readable medium of claim 12 , wherein the pixel variable value includes at least one of a blue chrominance, a red chrominance value, or a luminance value.

18. The machine-readable medium of claim 12 , wherein the pixel variable value includes a linear combination of two color values.

19. The machine-readable medium of claim 12 , wherein the message bit is part of at least one of a web site address, identification data, a promotional opportunity, authentication data, non-pictorial data, or combinations thereof.

20. The machine-readable medium of claim 12 , wherein the identifying of the comparison tile comprises:

accessing a decoding key, the decoding key including identification of the comparison tile in the source frame; and

identifying the comparison tile in accordance with the decoding key.

21. The machine-readable medium of claim 12 , further comprising instructions to decode an audio signal in the source frame and to provide a message using the source frame signal.