Halftone data-bearing encoding system and halftone data-bearing decoding system
US9544467B2 · kind B2 · utility
1Cited by
9References
6Claims
0Family size
Assignee
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Key dates
| Filing date | May 27, 2015 |
| Grant date | Jan 10, 2017 |
| Priority date | — |
| Expiry date | May 27, 2035 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG06K19/06103
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
An encoding system converts a grayscale image into an original halftone image according to a predetermined threshold matrix, determines carrier cells from the original halftone image according to reference dot patterns having rotationally asymmetric first-tone patterns, converts the carrier cells into encoded cells according to to-be-embedded codes and rotational states of corresponding asymmetric first-tone patterns, and optimizes non-carrier cells and encoded cells using a direct binary search technique to visually approach the grayscale image.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.