Page 45 - Video Coding for Mobile Communications Efficiency, Complexity, and Resilience

22 Chapter 2. Video Coding: Fundamentals

N : number of output symbols output, s ·
s max −
θ = s min
N 3 θ
d i = s min i + θ , 0 ≤ i ≤ N
θ
r i = d i + , 1 ≤ i ≤ N θ
− 1
2 2
θ
reconstruction levels, i r
step size, θ
input, s
0
− 7θ − 5θ − 3θ − θ θ 3θ 5θ 7θ
s
min 2 2 2 2 2 2 2 2 s max
− θ
decision levels, d i
− 2 θ

− 3 θ

(a) Without dead zone

. 7θ
output, s
2
5θ
2
3θ
2

step size,θ
dead zone
− 4 θ − 3 θ − 2 θ − θ θ 2 θ 3 θ 4 θ
input, s
− 3θ
2
− 5θ
2
7θ
−
2
(b) With dead zone
Figure 2.5: Uniform threshold quantizers