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Proceedings Paper

Data hiding in halftone images with parity coding
Author(s): Ming Sun Fu; Oscar Chi Lim Au
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Paper Abstract

In this paper, we propose a novel halftone image data hiding method called Data Hiding in Block Parity (DHBP), which hides the data in the block-sum parity. DHBP assumes that the original multi-tone image is available and the halftoning method is ordered dithering. DHBP can hide a relatively large amount of invisible watermarking data in halftone images while retaining good visual quality. In DHBP, one bit of information is hidden in a block of size MxN by forcing the parity of the sum of the MN pixels to be even or odd according to the data bit to be embedded. To alter the parity, one out of the MN pixels is chosen by minimizing the local image intensity change. Some custom- made quality measures are proposed to evaluate DHBP. Simulation results suggest that DHBP can hide a large amount of data while maintaining good visual quality.

Paper Details

Date Published: 1 August 2001
PDF: 9 pages
Proc. SPIE 4314, Security and Watermarking of Multimedia Contents III, (1 August 2001); doi: 10.1117/12.435419
Show Author Affiliations
Ming Sun Fu, Hong Kong Univ. of Science and Technology (Hong Kong)
Oscar Chi Lim Au, Hong Kong Univ. of Science and Technology (Hong Kong)

Published in SPIE Proceedings Vol. 4314:
Security and Watermarking of Multimedia Contents III
Ping Wah Wong; Edward J. Delp, Editor(s)

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