Encoding dot patterns into printed images based on source pixel color
AssigneeHewlett-Packard Development Company, L.P.
InventorsRobert Ulichney, Matthew D. Gaubatz
Life of this patent
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Abstract
In an example method, a set of source pixels corresponding to an image to be printed and a dot pattern of pixels including information to be encoded across the image are received. The dot pattern of pixels is mapped to a corresponding subset of the source pixels. A value of a clipping channel color in the subset of the source pixels is modified based on an original value of the clipping channel color for each pixel in the subset. The clipping channel color is used to detect the dot pattern of pixels. The image including the subset of pixels with modified clipping channel colors is printed.
Claims20
A method comprising:
- receiving a set of source pixels corresponding to an image to be printed and a dot pattern of pixels comprising information to be encoded across the image;
- mapping the dot pattern of pixels to a corresponding subset of the source pixels;
- modifying a value of a clipping channel color in the subset of the source pixels based on an original value of the clipping channel color for each pixel in the subset, wherein the clipping channel color is used to detect the dot pattern of pixels;
- and
- printing the image comprising the subset of pixels with modified clipping channel colors.
An apparatus comprising:
- a receiver to receive a set of source pixels corresponding to an image to be printed and a dot pattern of pixels comprising information to be encoded across the image;
- a pattern mapper to map the dot pattern of pixels to a corresponding subset of the source pixels;
- a pixel modifier to generate a color component representation for each of the corresponding subset of the source pixels and modify the color of each of the subset of the source pixels based on a replacement color corresponding to the color component representation in a predefined lookup table;
- and
- a printer to print the image comprising the subset of pixels with modified colors.
A non-transitory machine-readable storage medium encoded with instructions executable by a processor, the machine-readable storage medium comprising instructions to:
- receive a set of source pixels corresponding to an image to be printed and a dot pattern of pixels comprising information to be encoded across the image;
- map the dot pattern of pixels to a corresponding subset of the source pixels;
- modify a value of a clipping channel color in the subset of the source pixels based on an original value of the clipping channel color for each pixel in the subset, wherein the clipping channel color is to be used to detect the dot pattern of pixels;
- and
- print the image comprising the subset of pixels with modified clipping channel colors.
Dependencies are inferred from the claim text.