Page 166 - Video Coding for Mobile Communications Efficiency, Complexity, and Resilience

Section 6.2. Multiple-Reference Motion Estimation: A Review 143

Current frame

Frame
Memory 0

Frame
Memory 1
Previous Reference Motion vector
frame(s) Generation Multiple- (dx,dy,dt)
Reference
and
Memory Frame Motion
Memory 2 Estimation
Control

Frame
Memory M-1

(a) Multiple-reference motion estimation

temporal displacement, dt
spatial
displacements

(dx,dy)

current
block
best
match

Reference Reference Reference Reference Current frame
frame M-1 frame 2 frame 1 frame 0
Reference frames in multiframe memory

(b) Multiple-reference motion compensation
Figure 6.1: Multiple-reference motion-compensated prediction