Image-adaptive watermarking using 2-D chirps.

Linear chirps, a special case of polynomial phase exponentials, have recently been proposed for digital watermarking. In this work, we propose a known-host-state methodology for designing image watermarks that are robust to compression. We use a two-dimensional frequencymodulated chirp as a spreading function in a block-based spatial watermarking scheme. In each block, the chirp is used to embed binary phase information. Chirp parameters allow for spectral shaping of the watermark to match host content. Since host state is known to the embedder, it is possible to tune the chirp for optimum performance, particularly against compression. In contrast to existing chirp watermarking where only a single watermark is generally embedded, the proposed block chirp watermarking allows for a much higher payload. Detection is done using chirp transform subject to key exchange for security.We show that the proposed method significantly outperforms non-adaptive watermarking across all compression factors under variety of attacks.

Main Author: Zhang, Yimin.
Other Authors: Mobasseri, Bijan G., Dogahe, Behzad M., Amin, Moeness G.
Language: English
Published: 2010
Online Access: http://ezproxy.villanova.edu/login?url=https://digital.library.villanova.edu/Item/vudl:173345
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dc_source_str_mv Signal Image and Video Processing, March 2010.
author Zhang, Yimin.
author_s Zhang, Yimin.
spellingShingle Zhang, Yimin.
Image-adaptive watermarking using 2-D chirps.
author-letter Zhang, Yimin.
author_sort_str Zhang, Yimin.
author2 Mobasseri, Bijan G.
Dogahe, Behzad M.
Amin, Moeness G.
author2Str Mobasseri, Bijan G.
Dogahe, Behzad M.
Amin, Moeness G.
dc_title_str Image-adaptive watermarking using 2-D chirps.
title Image-adaptive watermarking using 2-D chirps.
title_short Image-adaptive watermarking using 2-D chirps.
title_full Image-adaptive watermarking using 2-D chirps.
title_fullStr Image-adaptive watermarking using 2-D chirps.
title_full_unstemmed Image-adaptive watermarking using 2-D chirps.
collection_title_sort_str image-adaptive watermarking using 2-d chirps.
title_sort image-adaptive watermarking using 2-d chirps.
description Linear chirps, a special case of polynomial phase exponentials, have recently been proposed for digital watermarking. In this work, we propose a known-host-state methodology for designing image watermarks that are robust to compression. We use a two-dimensional frequencymodulated chirp as a spreading function in a block-based spatial watermarking scheme. In each block, the chirp is used to embed binary phase information. Chirp parameters allow for spectral shaping of the watermark to match host content. Since host state is known to the embedder, it is possible to tune the chirp for optimum performance, particularly against compression. In contrast to existing chirp watermarking where only a single watermark is generally embedded, the proposed block chirp watermarking allows for a much higher payload. Detection is done using chirp transform subject to key exchange for security.We show that the proposed method significantly outperforms non-adaptive watermarking across all compression factors under variety of attacks.
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dc.title Image-adaptive watermarking using 2-D chirps.
dc.creator Zhang, Yimin.
Mobasseri, Bijan G.
Dogahe, Behzad M.
Amin, Moeness G.
dc.description Linear chirps, a special case of polynomial phase exponentials, have recently been proposed for digital watermarking. In this work, we propose a known-host-state methodology for designing image watermarks that are robust to compression. We use a two-dimensional frequencymodulated chirp as a spreading function in a block-based spatial watermarking scheme. In each block, the chirp is used to embed binary phase information. Chirp parameters allow for spectral shaping of the watermark to match host content. Since host state is known to the embedder, it is possible to tune the chirp for optimum performance, particularly against compression. In contrast to existing chirp watermarking where only a single watermark is generally embedded, the proposed block chirp watermarking allows for a much higher payload. Detection is done using chirp transform subject to key exchange for security.We show that the proposed method significantly outperforms non-adaptive watermarking across all compression factors under variety of attacks.
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