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Please use this identifier to cite or link to this item: http://hdl.handle.net/1783.1/3127
Title: Data hiding in ordered dithered halftone images
Authors: Fu, Ming Sun
Au, Oscar C.
Keywords: Data hiding
Halftone image
Invisible watermark
Ordered dithering
Screen modification
Threshold selection
Issue Date: 2001
Citation: Circuits, systems, and signal processing, v. 20, no. 2, 2001, p.209-232
Abstract: In this paper, we propose a novel method called Data Hiding Ordered Dithering (DHOD) to hide a relatively large amount of invisible watermarking data in ordered dithered halftone images while retaining good visual quality. We assume that both the original image and the ordered dithering screen are available. The proposed method includes two techniques: screen modification and threshold selection. Firstly, one out of every M pseudo-random locations is selected using threshold selection to embed one bit of hidden data. Secondly, at the selected locations, screen modification is applied to change the ordered dithering screen in a local neighborhood to achieve the desired data hiding while attaining good visual quality. Some custom-made quality measures are proposed to evaluate DHOD. Simulation results suggest that DHOD can hide a large amount of data while maintaining good visual quality.
Rights: The original publication is available at http://www.springerlink.com/
URI: http://hdl.handle.net/1783.1/3127
Appears in Collections:ECE Journal/Magazine Articles

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