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Table 2 Comparison of the PSNR and VQM among the conventional control, the proposed spatial resolution and the optimal spatial resolution at various target bitrates

From: Bitrate control using a heuristic spatial resolution adjustment for a real-time H.264/AVC encoder

Measurement tools

Rate control methods

1280 × 720

1920 × 1072

704 × 576

  

Target bitrate (kbps)

  

250

400

600

800

1000

400

800

1500

2000

150

300

400

1000

PSNR (Y)

Conventional

29.14

30.88

30.49

32.53

33.75

19.56

26.99

29.75

30.90

23.11

27.43

27.20

30.25

 

Proposed

30.14

31.08

32.35

33.74

34.57

31.70

33.55

35.36

36.11

25.40

27.20

27.97

30.70

 

Optimal

30.36

31.54

32.74

33.88

34.68

32.07

33.90

35.75

36.57

25.78

27.45

27.99

31.06

 

Difference(Full, Proposed)

1

0.2

1.85

1.21

0.82

12.15

6.56

5.60

5.20

2.29

-0.24

0.77

0.45

 

Difference(Optimal, Proposed)

0.22

0.46

0.39

0.14

0.12

0.37

0.35

0.39

0.46

0.39

0.25

0.02

0.37

VQM (Y)

Conventional

7.78

4.45

2.65

2.04

1.8

9.61

5.46

2.82

2.45

7.32

4.99

2.94

2.16

 

Proposed

2.63

2.36

2.13

1.81

1.68

2.82

2.20

1.78

1.59

3.50

2.89

2.76

2.02

 

Optimal

2.65

2.35

2.07

1.84

1.68

2.63

2.11

1.65

1.50

3.46

2.82

2.75

2.00

 

Difference(Full, Proposed)

5.15

2.09

0.51

0.23

0.12

6.79

3.26

1.04

0.86

3.82

2.10

0.18

0.14

 

Difference(Optimal, Proposed)

-0.02

0.01

0.06

-0.03

0

0.19

0.09

0.13

0.10

0.04

0.07

0.02

0.02