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Table 3 PSNR, SSIM, and CPU times of two interpolation methods using standard test images

From: Fast digital zooming system using directionally adaptive image interpolation and restoration

Image Type

Interpolation Type

PSNR

SSIM

Time (Sec)

Lena

Cubic-spline

33.7420

0.9693

0.281

Li’s method

33.9460

0.9729

16.286

Zhang’s method

33.8423

0.9723

12.979

Giachetti’s method

34.0461

0.9701

97.249

Zhou’s method

34.3944

0.9851

3.462

Proposed method

34.1497

0.9728

0.608

Barbara

Cubic-spline

23.9285

0.8873

0.281

Li’s method

22.1196

0.8665

17.006

Zhang’s method

25.1406

0.8989

13.058

Giachetti’s method

22.9126

0.8691

101.076

Zhou’s method

23.3526

0.9851

3.452

Proposed method

24.3669

0.8919

0.405

Boat

Cubic-spline

28.9056

0.9320

0.296

Li’s method

29.3233

0.9393

17.160

Zhang’s method

29.3349

0.9401

13.151

Giachetti’s method

28.8491

0.9329

101.463

Zhou’s method

29.5240

0.9835

3.439

Proposed method

29.2777

0.9388

0.390

Crowd

Cubic-spline

21.6893

0.9370

0.281

Li’s method

21.8357

0.9356

17.709

Zhang’s method

22.2017

0.9409

12.963

Giachetti’s method

21.7158

0.9367

99.841

Zhou’s method

22.2346

0.7517

3.347

 

Proposed method

22.0536

0.9414

0.460