In this research, we propose a reversible data hiding method based on pixel difference
histogram shifting and ripple strategy. Because the local area has similar
pixel value distribution in the natural image, the pixel differences will be narrowed
down within a small range. The ripple strategy is used to calculate the
pixel difference using the pixels in the outer ripple to subtract the pixels in the
inner ripples. Also, we found that the three highest pixel difference bins occure
most frequently at -1, 0, and 1, thus the proposed method need not remember the
peak-point and zero-point information for secret extraction and image recovering.
The experimental results show that the proposed method has better performance
than Huang and Chang’s method in terms of the embedding capacity.
