Patent
Method for encoding and decoding data in a color barcode pattern
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TLDR
In this article, the spectral properties of the CMY colorants, commonly used in digital printing, and those of RGB sensors are exploited to achieve high capacity data embedding rates in color barcodes.Abstract:
What is disclosed is a system and method for encoding and decoding data in a color barcode pattern using dot orientation and color separability. The spectral (wavelength) characteristics of the CMY colorants, commonly used in digital printing, and those of RGB sensors are exploited to achieve high capacity data embedding rates in color barcodes. The present method embeds independent data in two different printer colorant channels using dot orientation modulation. In the print end, dots of two colorants occupy the same spatial region. At the detector end, by using the complementary sensor channels to estimate the colorant channels, data is recovered in each colorant channel. The method approximately doubles the capacity of encoding methods based upon a single colorant channel and enables embedding rates which match or exceed that of other hardcopy barcodes known in the arts. The method is robust against inter-separation misregistration with a small symbol error rate.read more
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References
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Journal ArticleDOI
The expectation-maximization algorithm
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Method and means for embedding machine readable digital data in halftone images
TL;DR: In this paper, the angular orientation of circularly asymmetric halftone dot patterns is modulated in accordance with the grayscale data sample values that are provided to define the image.
Patent
Multi-color information encoding system
TL;DR: In this article, a super pixel dot is used to encode information including alphanumerics, with each colored region being variable as to both color and intensity. But the super pixel dots have different colored subregions within them, arranged with side-by-side colors or with colored regions stacked one on top of the other, such that information from one dot has as many color variables as there are stacked layers or mixed colors.
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Adaptive scaling for decoding spatially periodic self-clocking glyph shape codes
Dan S. Bloomberg,Robert F. Tow +1 more
TL;DR: Weighted and unweighted convolution filtering processes are provided for decoding bitmap image space representations of self-clocking glyph shape codes and for tracking the number and locations of the ambiquities or "errors" that are encountered during the decoding as mentioned in this paper.