Image

lena

baboon

boat

couple

Horizontal correlation coefficient

Original image

0.9991

0.7060

0.9602

0.8284

Encrypted Image

0.0012

−0.0122

−0.0032

−0.0412

Vertical correlation coefficient

Original image

0.9977

0.8350

0.7954

0.9124

Encrypted Image

0.0783

−0.0642

−0.0149

0.0261

Diagonal correlation coefficient

Original image

0.9972

0.6983

0.7922

0.7493

Encrypted Image

0.0372

−0.0064

−0.0016

-0.0339