Region-Based Watermarking of Biometric Images: Case Study in Fingerprint Images
Figure 8
Standard watermarking of test image. Image 22_6:
(a:1): difference image between original and watermarked images in the DWT
domain; (a:2): difference image when removing ROI in the DWT domain; (b:1):
difference image between original and watermarked images in the DFT domain;
(b:2): difference image when removing ROI in the DFT domain.
