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PRNU (Photo Response Non-Uniformity)

The unique pattern of pixel-level sensitivity variations in a camera sensor, used as a device fingerprint. A genuine camera-original image carries the source camera's PRNU pattern; an AI-generated image does not. PRNU matching requires a reference flat-field image from the claimed camera.

Explained in

AI-Generated Documents, Deepfake Signatures and Image Manipulation

Related terms

Adversarial attack Automatic Signature Verification (ASV)C2PA (Coalition for Content Provenance and Authenticity)Content-aware fill Diffusion model ESDA (Electrostatic Detection Apparatus)GAN (Generative Adversarial Network)GAN spectrum fingerprint JUMBF (JPEG Universal Metadata Box Format)

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