In this paper, we propose a novel scheme of data hiding for halftone image which is extended from Fu and Oscar's DHSPT method (data hiding smart pair toggling), it is named as DHADPT (data hiding by absolute difference pair toggling). In this method, we embed the binary data into the halftone image with reference to the original multitone image by evaluating the absolute difference between the neighboring gray-level pixels. The location with minimum sum of the absolute differences of the eight neighboring locations will be the candidate to hide bit data. Experimental results prove its superiority to the original DHSPT method (with higher modified peak signal-to-noise ratio [MPSNR]).
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