ENCODING DATA IN AN IMAGE

摘要

Certain methods and systems are described for encoding data in an image. According to an example, a set of metamers under a first set of conditions may be determined that vary under a second set of conditions. These may be used to generate a set of color mappings for a sampled color value, each color mapping being used for a different data value in the data. As such the data values may be detectable when the image is observed under the second set of conditions but not detectable when the image is observed under the first set of conditions.

主权项

1. A method of determining a set of color mappings for encoding data values in an image comprising:
determining, for at least one sampled color in a first color space associated with a first set of conditions, a set of metamers for the sampled color, each metamer having a different representation in a second color space, the second color space being used to output the image; determining a range of color differences for the set of metamers under a second set of conditions; and determining a plurality of color mappings to the second color space for the at least one sampled color based on the range of color differences, wherein each color mapping in the plurality of color mappings is useable to encode a different data value in the image, and wherein the data values are detectable when the second set of conditions are applied to the image.