Kostenloser Stacking Signal-to-Noise Rechner
Berechnen Sie den SNR improvement aus stacking astrophotography frames. Kostenloser stacking Rechner.
Stacked SNR
50.0000
Stacked SNR vs Single-Frame SNR
Formel
Signal-to-Noise Improvement from Stacking
Stacking multiple exposures averages out random noise while the signal adds coherently.
Formula
SNR_total = SNR_single * sqrt(N)
Doubling the SNR requires four times as many frames. This is the square-root law of signal averaging.
Lösungsbeispiel
Stack 100 frames each with SNR = 5.
- 01SNR_total = SNR_single * sqrt(N)
- 02SNR_total = 5 * sqrt(100)
- 03SNR_total = 5 * 10 = 50
Häufig Gestellte Fragen
Is stacking better than one long exposure?
For the same total time, ideally they are equivalent. In practice, stacking is better because it allows rejection of satellite trails, cosmic rays, and bad frames.
Does this assume noise is random?
Yes. The sqrt(N) law applies to uncorrelated random noise (shot noise, read noise). Systematic patterns (e.g., vignetting) must be removed separately.
How many frames do I need?
For a 10x SNR improvement you need 100 frames. For 3x you need only 9. Diminishing returns set in at high frame counts.