Artwork generated to convey digital messages, and methods/apparatuses for generating such artwork

1. A method of producing an output 2D machine-readable indicia from an input 2D machine-readable indicia, comprising the acts:

identifying a first excerpt of the input 2D machine-readable indicia;

processing the first excerpt to yield a tile having an organized structure, by applying to said first excerpt one or more transformation operations, including at least one transformation operation from the list: (a) mirroring, (b) rotating, (c) translation, (d) toroidal shifting, (e) signal-inverting, (f) scaling and (g) glide transformation;

incorporating said tile in the output 2D machine-readable indicia; and

rendering said output 2D machine-readable indicia on a tangible article to be visible to human observers, wherein the output indicia has a non-steganographic form on said article.

2. The method of claim 1 that further includes:

capturing imagery of said tangible article;

decoding a plural-symbol payload from a depiction of the output indicia in the captured imagery; and

taking an action based on the decoded plural-symbol payload.

3. The method of claim 2 in which the action includes adding said article to a checkout tally of a shopper.

4. The method of claim 1 that further includes applying to said first excerpt two different transformation operations from said list.

5. The method of claim 1 that further includes pre-processing the input 2D machine-readable indicia prior to identifying the first excerpt therefrom, said pre-processing including applying a conformal transformation to at least part of the input 2D machine-readable indicia, and applying an inverse-conformal transformation to the tile prior to incorporating the tile into the output indicia.

6. The method of claim 1 in which the output 2D machine-readable indicia is other than an affine-transformed version of the input 2D machine-readable indicia.

7. The method of claim 1 in which the output 2D machine-readable indicia is other than a toroidally-shifted version of the input 2D machine-readable indicia.

8. The method of claim 1 in which the output 2D machine-readable indicia is other than plural versions of the input 2D machine-readable indicia summed at different scales.

9. The method of claim 1 in which said processing comprising applying one of said listed transformation operations to the first excerpt to yield a first interim result, applying one of said listed transformation operations to the first excerpt to yield a second interim result different than the first result, and summing the first and second interim results.

10. The method of claim 1 that further includes:

identifying a second excerpt of the input 2D machine-readable indicia, different than the first excerpt;

processing the second excerpt to yield a second tile having an organized structure, by applying to said second excerpt one or more transformation operations from said list; and

incorporating said second tile in the output 2D machine-readable indicia.

11. The method of claim 1 in which said rendering of the output indicia in non-steganographic form allows relaxed rendering tolerances as compared with an output indicia that is to be rendered in steganographic form.

12. The method of claim 1 in which said tile has an axis of symmetry.

13. The method of claim 1 in which said one or more transformation operations comprises rotating the excerpt by plural different angles, or shifting the excerpt by plural different shifts, to thereby yield plural intermediate results, and said processing includes computing a sum of said intermediate results.

14. The method of claim 13 in which said processing includes assigning a weighting factor to each of said plural intermediate results, scaling each of said intermediate results by the weighting factor assigned thereto, and summing the scaled intermediate results to yield a weighted sum.

15. The method of claim 14 wherein at least one of said weighting factors is a negative number.

16. The method of claim 1 in which identifying the first excerpt of the input 2D machine-readable indicia includes applying a windowing function to the input 2D machine-readable indicia, or a sub-block thereof.

17. The method of claim 1 in which the excerpt has a non-square shape.

18. A method of producing an output 2D machine-readable indicia from an input 2D machine-readable indicia, comprising the acts:

identifying an excerpt of the input 2D machine-readable indicia;

processing the excerpt to yield a tile having an organized structure, by applying to said excerpt two or more transformation operations, including at least two different transformation operations from the list: (a) mirroring, (b) rotating, (c) translation, (d) toroidal shifting, (e) signal-inverting, (f) scaling, and (g) glide transformation;

incorporating said tile in the output 2D machine-readable indicia.

19. The method of claim 18 that further includes:

forming said output 2D machine-readable indicia on a tangible article;

capturing imagery of said tangible article;

decoding a plural-symbol payload from a depiction of the output indicia in the captured imagery; and

taking an action based on the decoded plural-symbol payload.

20. A method of producing an output 2D machine-readable indicia from an input 2D machine-readable indicia, comprising the acts:

identifying an excerpt of the input 2D machine-readable indicia;

processing the excerpt to yield a tile having an organized structure, by:

(i) applying to said excerpt a transformation operation from the list: (a) mirroring, (b) rotating, (c) translation, (d) toroidal shifting, (e) signal-inverting, and (f) glide transformation, to yield a first interim result;

(ii) applying to said excerpt a transformation operation from said list to yield a second interim result different than the first interim result; and

(iii) summing the first and second interim results; and

incorporating said tile in the output 2D machine-readable indicia.