Table 20 Correlation of color RGB images.

From: RGB image encryption using SPN with a novel block cipher over simple graph adjacency matrices and Galois fields

Images

Channels

Directions

Horizontal

Vertical

Diagonal

Red

Green

Blue

Red

Green

Blue

Red

Green

Blue

Deblur original

Red

0.9943

0.5710

− 0.1989

0.9907

0.5671

− 0.1683

0.9855

0.5011

− 0.1201

Green

− 0.2055

0.9952

0.9836

− 0.0600

0.9877

0.9746

− 0.1174

0.9760

0.9577

Blue

− 0.0547

0.0727

0.9804

− 0.1092

0.0608

0.9703

− 0.1143

0.0780

0.9603

Deblur encrypted

Red

0.0002

0.0066

0.0338

0.0521

0.0345

0.0220

0.0319

− 0.0594

− 0.0144

Green

− 0.0245

− 0.0652

− 0.0336

− 0.0026

0.0145

0.0141

− 0.0499

0.0385

0.0234

Blue

− 0.0183

− 0.0109

− 0.0308

0.0219

− 0.0574

0.0027

− 0.0056

− 0.0600

0.0438

Oakland original

Red

0.9405

0.8672

0.5642

0.9217

0.8175

0.5704

0.8879

0.7767

0.5077

Green

0.6245

0.8514

0.6726

0.5846

0.8358

0.5732

0.5004

0.7675

0.3888

Blue

0.6250

0.6377

0.6244

0.5401

0.5849

0.4898

0.5177

0.5617

0.4147

Oakland encrypted

Red

0.0103

0.0327

0.0389

0.0004

0.0542

0.0132

0.0633

0.0282

0.0384

Green

0.0589

0.0253

− 0.0410

0.0164

− 0.0064

0.0213

0.0310

− 0.0280

− 0.0339

Blue

0.0233

− 0.0139

− 0.0271

0.0211

0.0148

0.0187

0.0220

− 0.0273

0.0788

Stockton original

Red

0.9111

0.8725

0.7512

0.9027

0.8753

0.7368

0.8778

0.8270

0.6634

Green

0.7440

0.8894

0.7620

0.7257

0.8771

0.6912

0.7016

0.8016

0.6212

Blue

0.7160

0.7623

0.6868

0.7205

0.7650

0.7677

0.6742

0.7027

0.6032

Stockton encrypted

Red

0.0086

0.0258

0.0377

− 0.0033

0.0129

0.0266

− 0.0299

− 0.0090

0.0499

Green

− 0.0199

− 0.0119

0.0369

0.0255

0.0016

0.0285

− 0.0119

− 0.0371

0.0241

Blue

− 0.0407

0.0210

− 0.0156

− 0.0489

− 0.0389

0.0116

− 0.0722

− 0.0057

− 0.0428

House original

Red

0.9630

0.6445

0.5015

0.9279

0.6215

0.4757

0.8819

0.5895

0.4466

Green

0.4909

0.9843

0.9877

0.4502

0.9598

0.9733

0.4573

0.9467

0.9663

Blue

0.4886

0.9496

0.9869

0.4387

0.9560

0.9756

0.4412

0.9400

0.9590

House encrypted

Red

− 0.0057

− 0.0205

0.0229

− 0.0145

− 0.0310

0.0087

− 0.0084

0.0400

− 0.0113

Green

− 0.0616

− 0.0403

− 0.0208

0.0197

0.0074

0.0115

− 0.0325

0.0200

− 0.0297

Blue

0.0274

0.0146

0.0080

0.0244

0.0336

0.0315

0.0016

− 0.0175

0.0196