DETECTIONS OF WATERMARK
Fig . Using digital watermarks for integrity verification: the
protected image is the image (a) above; a modified image is
obtained by swapping the numbers 9 and 4 of the number plate
(b); digital watermarking technology allows detecting and
highlights the modified areas, as shown on (c).
Hacker attempts to remove or destroy the
Hacker tries to find if a watermark is present.
Removal of watermark is not an aim.
Hacker uses several copies of watermarked
data (images, video etc.) to construct a copy
with no watermark.
Hacker tries to embed a valid watermark
APPLICATIONS OF DW
ID card security.
Copy prevention or control.
Fraud and tamper detection.
LIMITATIONS OF DW
Digital watermarking does not prevent
copying or distribution.
Digital watermarks cannot survive every
Digital watermarking is a rapidly evolving
area of research and development.
One key research problem that we still face
today is the development of truly robust,
transparent and secure watermarking technique
for different digital media including images,
video and audio.