Table 19 Contrast and energy of different RGB 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

Red

Contrast

Green

Blue

Red

Energy

Green

Blue

Female

10.5189

10.4213

10.5021

0.0156

0.0156

0.0156

Pepper

10.5037

10.5140

10.4472

0.0156

0.0156

0.0156

House

10.4848

10.4162

10.4944

0.0156

0.0156

0.0156

Sailboat on Lake

10.6070

10.5319

10.4661

0.0156

0.0156

0.0156

[25]

10.4878

10.4861

10.5034

0.0156

0.0156

0.0156

[26]

10.5357

10.4913

10.4710

0.0156

0.0156

0.0156

[33]

10.4327

10.4897

10.4779

0.0156

0.0156

0.0156

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