Table 5 Correlation coefficients for adjacent pixel pairing for colour images (in Fig. 3(d–f)).

From: Quantum-inspired cascaded discrete-time quantum walks with induced chaotic dynamics and cryptographic applications

Image

Direction

Horizontal

Vertical

Diagonal

R

G

B

R

G

B

R

G

B

Original (Sailboat)

0.9552

0.9555

0.9644

0.9582

0.9567

0.9606

0.9311

0.9249

0.9373

Encrypted (Sailboat)

−0.0003

−0.0082

−0.0003

−0.0022

−0.0020

0.0047

0.0013

0.0004

0.0010

Original (Tree)

0.9392

0.9485

0.9438

0.9584

0.9696

0.9615

0.9221

0.9339

0.9308

Encrypted (Tree)

−0.0029

−0.0048

−0.0023

−0.0013

−0.0012

−0.0050

−0.0007

0.0012

−0.0061

Original (House)

0.9357

0.9636

0.9764

0.9678

0.9812

0.9824

0.9107

0.9490

0.9641

Encrypted (House)

0.0027

−0.0081

−0.0009

−0.0023

0.0005

0.0030

−0.0040

0.0007

−0.0029

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