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Table 6 Resulting Δ Z (%) values when employing the method proposed by Sousa [9] in the first stage

From: A two-stage algorithm for the early detection of zero-quantized discrete cosine transform coefficients in High Efficiency Video Coding

QP

Stage

Class B

Class C

Class D

Class E

  

N=8

16

32

N=8

16

32

N=8

16

32

N=8

16

32

22

Stage 1

0.4

0

0

1.5

0.3

0

1.9

0.1

0

4.8

0.01

0

 

Stage 2

23.3

7.13

5.72

23.1

14.6

9.24

23.9

14.8

10.1

31.5

32.6

12.2

 

Δ Z Total

23.7

7.13

5.72

24.6

14.9

9.24

25.8

14.9

10.1

36.3

32.61

12.2

27

Stage 1

5.6

0

0

5.3

0.4

0

5.7

0.6

0

21.6

0.5

0

 

Stage 2

32.8

30.3

9.5

31.9

32.4

20.4

32.1

33.7

20.8

23.5

42.7

31.8

 

Δ Z Total

38.4

30.3

9.5

37.2

32.8

20.4

37.8

34.3

20.8

45.1

43.2

31.8

32

Stage 1

19.5

1.6

0

17.7

1.3

0

19.1

1.2

0

27.7

17.6

0

 

Stage 2

27.7

42.8

35.3

30.0

38.6

28.7

32.0

37.7

32.9

26.1

46.0

40.3

 

Δ Z Total

47.2

44.4

35.3

47.7

39.9

28.7

51.1

38.9

32.9

53.8

63.6

40.3

37

Stage 1

32.4

5.8

0

31.8

5.4

0

39.1

14.5

0

47.0

22.8

0.2

 

Stage 2

17.0

39.3

42.2

20.3

40.4

35.2

17.8

44.7

40.2

12.4

45.2

44.1

 

Δ Z Total

49.4

45.1

42.2

52.1

45.8

35.2

56.9

59.2

40.2

59.4

68.0

44.3