Research Article
Color Image Authentication and Recovery via Adaptive Encoding
Table 2
Block types and codebooks
of differential coding.
| Type | | Codeword | 0 | 1 | 2 | 3 | 4 | 5 | 6 | 7 | 8 | 9 | 10 | 11 | 12 | 13 | 14 | 15 |
| 0 | 0, 1 | N/A | | | | | | | | | | | | | | | | 1 | 2 | −2 | −1 | 1 | 2 | | | | | | | | | | | | | 2 | 3, 4 | −4 | −3 | −2 | −1 | 1 | 2 | 3 | 4 | | | | | | | | | 3.1 | ≥5 | −11 | −10 | −9 | −8 | −7 | −5 | −2 | 0 | 1 | 2 | 4 | 5 | 7 | 8 | 10 | 11 | 3.2 | ≥5 | −20 | −17 | −15 | −12 | −10 | −7 | −5 | −2 | 0 | 3 | 6 | 8 | 12 | 13 | 16 | 19 | 3.3 | ≥5 | ⋯ | | | | | | | | | | | | | | | | 3.4 | ≥5 | ⋯ | | | | | | | | | | | | | | | | 3.5 | ≥5 | ⋯ | | | | | | | | | | | | | | | |
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