A Flexible Scheme of Self Recovery for Digital Image Protection
This paper proposes a self-embedding method with flexible
restoration capability. We present a method of encoding DCT
coefficients of each block into reference bits for self-embedding.
In order to improve the restoration capability, we classify the
selected coefficients into three types, and assign different bits for
each type to generate reference bits. The generated reference bits
are embedded into the original image, along with authentication
bits derived from the content by hash function. On the receiver
side, after identifying tampered blocks by authentication bits,
reference bits are extracted from the reserved blocks to
approximately reconstruct the principal content of the lost
information. Three cases of flexible quality restoration are
analyzed corresponding to different tampering rates. Even up to
75% of the protected image is tempered; the original content can
still be recovered approximately.
Keywords: Data Hiding, Self-Embedding, Content Restoration, Fragile Watermarking
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ABOUT THE AUTHORS
Zhenxing Qian
School of Communication and Information Engineering, Shanghai University, Shanghai 200072, China
Lili Zhao
School of Communication and Information Engineering, Shanghai University, Shanghai 200072, China
Zhenxing Qian
School of Communication and Information Engineering, Shanghai University, Shanghai 200072, China
Lili Zhao
School of Communication and Information Engineering, Shanghai University, Shanghai 200072, China