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Table 1 PSNR (top left), sharpness (top right), SSIM (bottom left) and contrast (bottom right), scale factor 2 comparison of the bicubic (Bic.) technique, algorithm of Yang et al.’s [11], algorithm of Xu et al.’s [12] and proposed algorithm

From: Single image super-resolution by directionally structured coupled dictionary learning

Images

Bic.

[11]

[12]

Proposed(PMS)

Proposed

AnnieYukiTim

31.42

0.5709

32.79

0.3824

32.76

0.3848

33.83

0.3659

32.86

0.3789

 

0.9064

0.3280

0.9375

0.1879

0.9376

0.1865

0.9338

0.2038

0.9221

0.1961

Barbara

25.34

0.7400

25.34

0.5531

25.81

0.5555

26.46

0.5439

25.91

0.5438

 

0.7929

0.5890

0.8356

0.4199

0.8330

0.4207

0.8563

0.4274

0.8360

0.4249

BooksCIMAT

24.89

0.6176

26.02

0.3940

27.17

0.4075

26.62

0.3916

26.21

0.3987

 

0.8271

0.4075

0.8826

0.2047

0.9039

0.2176

0.8941

0.2272

0.8829

0.2151

Butterfly

27.45

0.4541

30.07

0.2174

29.85

0.2182

31.77

0.1961

30.53

0.1965

 

0.8984

0.1633

0.9445

0.0145

0.9430

0.0101

0.9508

0.0569

0.9460

0.0356

Fence

25.04

0.6432

26.32

0.4563

27.85

0.4693

27.31

0.4414

26.36

0.4483

 

0.7448

0.5281

0.8158

0.3271

0.8496

0.3395

0.8332

0.3379

0.8210

0.3289

ForbiddenCity

24.06

0.7143

24.66

0.5559

25.90

0.5718

25.58

0.5465

24.75

0.5569

 

0.6767

0.5759

0.7549

0.3974

0.7925

0.4078

0.7930

0.4062

0.7899

0.4062

HowMany

27.98

0.5739

29.19

0.3735

29.16

0.3750

30.04

0.3586

29.17

0.3599

 

0.8686

0.3038

0.9126

0.1571

0.9120

0.1545

0.9000

0.1708

0.8843

0.1637

Kodak-05

23.97

0.7055

24.78

0.5372

25.89

0.5483

25.60

0.5256

25.56

0.5256

 

0.7235

0.5015

0.7898

0.3365

0.8239

0.3444

0.8154

0.3510

0.8101

0.3449

Kodak-08

22.12

0.7182

22.81

0.5638

23.48

0.5723

23.83

0.5461

22.90

0.5539

 

0.6995

0.5183

0.7672

0.3569

0.7950

0.3592

0.8027

0.3633

0.7570

0.3602

Michoacan

22.19

0.6614

23.85

0.4851

24.96

0.4992

24.76

0.4702

24.32

0.4729

 

0.7877

0.4506

0.8388

0.2879

0.8627

0.2979

0.8508

0.3000

0.8346

0.2943

MissionBay

26.67

0.6174

27.90

0.4294

27.86

0.4295

29.27

0.4003

28.89

0.4092

 

0.8459

0.3475

0.8883

0.1928

0.8868

0.1899

0.9040

0.2129

0.9010

0.2047

NuRegions

19.81

0.5326

21.30

0.3413

22.09

0.3536

22.14

0.3255

21.35

0.3266

 

0.8469

0.2749

0.9047

0.0780

0.9182

0.0875

0.9207

0.0898

0.9046

0.0848

Peppers

29.95

0.5459

31.22

0.3545

31.94

0.3781

31.91

0.3253

31.56

0.3261

 

0.9045

0.2395

0.9422

0.1113

0.9583

0.1270

0.9608

0.1382

0.9596

0.1248

Rocio

36.63

0.4019

39.19

0.1816

39.01

0.1821

40.38

0.1516

38.98

0.1674

 

0.9612

0.1640

0.9778

0.0515

0.9773

0.0455

0.9745

0.0660

0.9799

0.0530

Starfish

30.22

0.5101

32.12

0.2880

32.04

0.2895

33.09

0.2765

32.89

0.2846

 

0.8923

0.2779

0.9358

0.1239

0.9354

0.1208

0.9365

0.1380

0.9332

0.1331

Yan

26.96

0.6346

28.01

0.4579

27.94

0.4590

29.16

0.4346

28.15

0.4411

 

0.8276

0.3878

0.8743

0.2268

0.8729

0.2227

0.8795

0.2447

0.8898

0.2357

Average

26.54

0.6026

27.85

0.4107

28.36

0.4184

28.86

0.3937

28.15

0.3994

 

0.8253

0.3786

0.8752

0.2171

0.8876

0.2207

0.8879

0.2334

0.8783

0.2254

  1. The data in boldface signifies highest value in comparison