Table 18 Correlation analysis of different RGB encrypted Images.

From: A novel color images security-based on SPN over the residue classes of quaternion integers \(\:\varvec{H}{\left(\mathbb{Z}\right)}_{\varvec{\pi\:}}\)

Images

Channels

Directions

Vertical

Horizontal

Diagonal

Red

Green

Blue

Red

Green

Blue

Red

Green

Blue

Female Encrypted

Red

−0.0401

−0.0224

0.0761

−0.0024

0.0176

0.0261

0.0050

0.0056

−0.0086

Green

0.0142

−0.0575

−0.0032

0.0523

0.0093

−0.0511

0.0003

0.0273

0.0133

Blue

0.0255

−0.0106

−0.0334

0.0102

0.0166

−0.0528

0.0138

−0.0341

0.0493

Pepper Encrypted

Red

0.0146

0.0275

−0.0791

0.0278

−0.0833

0.0139

−0.0472

−0.0138

0.0543

Green

0.0003

−0.0055

−0.0320

−0.0183

−0.0435

0.0020

−0.0439

−0.0262

−0.0153

Blue

0.0177

−0.0443

−0.0019

−0.0142

0.0142

−0.0351

0.0188

−0.0189

−0.0040

House Encrypted

Red

−0.0638

0.0012

−0.0063

−0.0043

−0.0017

0.0823

0.0295

0.0074

−0.0055

Green

0.0026

0.0491

0.0073

−0.0077

−0.0195

−0.0457

−0.0098

−0.0103

−0.0085

Blue

0.0178

0.0042

0.0224

0.0010

0.0405

−0.0065

−0.0004

0.0082

−0.0166

Sailboat on Lake Encrypted

Red

0.0227

0.0381

0.0008

0.0228

0.0087

−0.0421

0.0309

0.0517

0.0048

Green

−0.0277

−0.0480

0.0208

0.0081

0.0099

−0.0285

−0.0003

0.0157

0.0355

Blue

0.0030

0.0114

0.0251

0.0126

−0.0151

−0.0401

0.0284

−0.0218

0.0549

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