$\left(2,2\right)$

Zero padding

[11] without EP

[11] with EP

DT-CWT-NLM [14]

SWT-DWT [15]

Proposed Method (integer)

Proposed Method (floating-point)

Lena

34.60

35.26

35.33

29.08

31.60

35.86

35.90

Baboon

24.12

24.11

24.19

21.28

21.73

24.20

24.20

Barbara

25.77

25.53

25.85

22.83

23.28

26.06

26.07

Boat

30.29

30.68

30.73

26.06

27.66

30.73

30.74

Peppers

30.87

33.07

33.13

28.73

29.91

33.10

33.12

Medical 1

36.81

37.13

37.23

34.32

34.89

37.28

37.31

Medical 2

44.41

44.40

44.64

37.52

40.19

44.33

44.52