GPU Pro 6

3. Hybrid Reconstruction Antialiasing 131

Min

Max

Mean

δδ δδ

Value

Acceptance

Figure 3.23. Frequency-based acceptance function plot.

3.7.2 Frequency-Based Acceptance Metric

A simple temporal antialiasing scheme can be described as a cumulative blend

between the current frame and an accumulation buffer of previous frames (history

data). However, finding the correct blend factor is difficult. We would like to

stabilize the data such that we avoid fluctuations over time and enhance the

image quality by accumulating new information. On the other hand, we need to

detect when data becomes stale or invalid.

We build a color bounding box of fresh data by sampling the