Table 3: Correlation coefficients between adjacent pairs of pixels for original and encrypted images.

Correlation Horizontal Vertical Diagonal

Original image: lena 0.9763 0.9453 0.9282
Encrypted image: lena 0.0068 0.0091 0.0063

Original image: black 1.0000 1.0000 1.0000
Encrypted image: black 0.0046 0.0055 0.0056

Original image: baboon 0.8567 0.8772 0.7880
Encrypted image: baboon 0.0055 0.0078 0.0042

Original image: checkerboard 0.9578 0.9521 0.9118
Encrypted image: checkerboard 0.0039 0.0090 0.0045