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	⋯