Received Watermarked Image

Apply two level IWT

Calculate the watermark from the approximate coefficient

Extract the watermark from the detail coefficients

KM

Calculate NHS

Is NHS > 0.99

Image is authenticated

0.50 ≤ NHS ≤ 0.99

Image cannot be authenticated

Plot the tamper detection map

Are False Positives Present

Incidental attack

Image is authenticated

Image is tampered with malicious attack

Recovery of the tampered part