Combining Digital Watermarking and Fingerprinting Techniques to Identify Copyrights for Color Images

Table 1

The mapping table.

Feature type 𝑇	Mean value position	White logo pixel		FT-share; XOR; FP-share	Black logo pixel		FT-share; XOR; FP-share
		FT-share	FP-share		FT-share	FP-share
1	𝑎<𝐴<𝑏,𝑐,𝑑
	𝑏<𝐴<𝑎,𝑐,𝑑
	𝑐<𝐴<𝑎,𝑏,𝑑
	𝑑<𝐴<𝑎,𝑏,𝑐
2	𝑎,𝑏≤𝐴<𝑐,𝑑
	𝑐,𝑑≤𝐴<𝑎,𝑏
	𝑎,𝑑≤𝐴<𝑏,𝑐
	𝑏,𝑐≤𝐴<𝑎,𝑑
	𝑎,𝑐≤𝐴<𝑏,𝑑
	𝑏,𝑑≤𝐴<𝑎,𝑐
3	𝑏,𝑐,𝑑≤𝐴<𝑎
	𝑎,𝑐,𝑑≤𝐴<𝑏
	𝑎,𝑏,𝑑≤𝐴<𝑐
	𝑎,𝑏,𝑐≤𝐴<𝑑
4	𝐴=𝑎=𝑏=𝑐=𝑑
	The coefficients of the LL2 subband (a is at the top left position, b the top right, c the bottom left, and d the bottom; right)

FT-share: feature share; FP-share: fingerprint share.