Frequency Domain Artifacts
Invisible grid-like patterns detectable only with Fourier analysis tools.
This one is for the nerds. Images are made of pixels, but they're also made of waves (frequencies). Real cameras capture these waves naturally. AI builds them from scratch, and it leaves a mark.
The Invisible Grid
AI up-scales images from a tiny noise map. This leaves a mathematical "fingerprint"—often a grid or checkerboard pattern—that you can't see with your eyes but stands out like a neon sign in analysis software.
It's why automated "AI Detectors" can sometimes spot a fake that looks perfect to you. They aren't looking at the picture; they're looking at the math.
Common Manifestations
The Star Pattern: In a Fast Fourier Transform (FFT) heatmap, AI images often show a bright cross or star pattern in the center, representing the up-sampling grid.
How to Spot It
- 1This requires software tools (like Fourier analysis plugins).
- 2Look for "checkerboard artifacts" in high-contrast transitions.
- 3Understanding that AI is math-based, not light-based, helps demystify the "magic".