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In Mode 1, you can input an image and let it be tested with the AI detector. It will also give you a visible PRNU noise pattern.
In Mode 2, you can provide reference images of the camera you want your image to be compared with. The best images for this purpose are photos of bright white walls. The better your reference images, the fewer you need for a satisfactory result. Afterwards, calculate your reference and provide a test image.
For a detailed explanation, please refer to the paper. PRNU (Photo-Response Non-Uniformity) is a noise pattern created by imprecisions in camera sensor production.