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Table 7 Resulting Δ Z (%) values when employing the method proposed by Xie et al. [16] 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

0

0

0

0

0

0

0

0

0

0

0

 

Stage 2

23.4

7.13

5.72

23.7

14.7

9.24

24.1

15.1

9.21

32.7

32.6

12.2

 

Δ Z Total

23.4

7.13

5.72

23.7

14.7

9.24

24.1

15.1

9.21

32.7

32.6

12.2

27

Stage 1

0

0

0

0.1

0

0

0.1

0

0

0

0

0

 

Stage 2

37.8

30.3

9.5

36.8

32.5

20.4

37.4

33.1

22.5

43.5

42.8

31.8

 

Δ Z Total

37.8

30.3

9.5

36.9

32.5

20.4

37.5

33.1

22.5

43.5

42.8

31.8

32

Stage 1

0

0

0

0.8

0

0

0.9

0

0

1.0

0

0

 

Stage 2

45.5

43.8

35.3

43.3

38.6

28.7

44.5

38.9

31.3

47.4

56.3

40.3

 

Δ Z Total

45.5

43.8

35.3

44.1

38.6

28.7

45.4

38.9

31.3

48.4

56.3

40.3

37

Stage 1

1.5

0.1

0

5.6

1.0

0

5.8

0.2

0

6.8

0

0

 

Stage 2

47.3

43.2

42.2

45.2

42.2

35.2

45.1

44.1

38.9

45.5

51.6

44.2

 

Δ Z Total

48.8

43.3

42.2

50.8

43.2

35.2

50.9

44.3

38.9

52.3

51.6

44.2