We developed a generic
content-based solution targeting at authenticating image in a semi-fragile
way, which integrates watermarking-based approach with signature-based
approach. Robust signatures are cryptographically generated based on invariant
features called significance-linked connected component (SLCC) extracted
from image content and are then signed and embedded back into the image
again as watermarks, all in the wavelet domain. De-noising and morphological
filtering are applied as pre-processing to tame some small perturbations
on extracted features caused by various incidental distortions introduced
in acceptable manipulations such as lossy compression, common image processing
(blurring, sharpening, etc.) as well as watermarking. Error correcting
coding is employed to further bridge between generated signatures and
watermarks in a novel way: message bits are formed based on SLCC features,
and parity check bits are taken as the seeds of watermarks. The generated
signature is hashable and can be incorporated into a PKI framework.
Dr. Qibin Sun
Q. Sun and S.-F. Chang,
Semi-fragile image authentication using generic wavelet domain features
and ECC, ICIP2002, Rochester, USA, 2002.
Q. Sun, S.-F. Chang, M. Kurato
and M. Suto, A
new semi-fragile image authentication framework combining ECC and PKI,
Invited paper for Special Session on Multimedia Watermarking, ISCAS2002,
Phoenix, USA, 2002.
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Last updated: June 12, 2002.