Table 20 Correlation of multiple RGB images.

From: Multiple color images security by SPN over the residue classes of Gaussian integer \(\:Z{\left[i\right]}_{h}\)

Images

Channels

Directions

Vertical

Horizontal

Diagonal

Red

Green

Blue

Red

Green

Blue

Red

Green

Blue

Image 1 Original

Red

0.9548

0.3195

0.1545

0.9653

0.3198

0.1346

0.9399

0.3712

0.1640

Green

0.1610

0.9471

0.9509

0.1540

0.9433

0.9662

0.1284

0.9054

0.9374

Blue

0.1591

0.5261

0.9522

0.2373

0.5177

0.9587

0.1341

0.4850

0.9255

Image 1 Encrypted

Red

-0.0098

0.0231

0.0189

-0.0165

-0.0069

0.0451

-0.0114

0.0111

-0.0232

Green

0.0344

0.0083

0.0383

-0.0321

0.0401

-0.0129

0.0023

0.0021

-0.0206

Blue

-0.0297

-0.0239

-0.0054

0.0125

0.0396

0.0499

0.0499

0.0128

-0.0104

Image 2 Original

Red

0.9785

0.6599

0.7541

0.9562

0.6516

0.7018

0.9409

0.6419

0.7201

Green

0.7168

0.9766

0.9835

0.7321

0.9489

0.9539

0.7149

0.9338

0.9458

Blue

0.7463

0.8341

0.9797

0.7260

0.8063

0.9619

0.7175

0.7986

0.9537

Image 2 Encrypted

Red

0.0568

-0.0029

0.0265

0.0170

0.0364

-0.0104

-0.0206

0.0332

-0.0149

Green

0.0303

0.0109

0.0214

0.0234

0.0392

0.0355

-0.0016

0.0034

0.0210

Blue

-0.0156

-0.0490

0.0020

0.0421

0.0360

0.0

-0.0259

-0.0219

-0.0287

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