Data from: An RGB colour image steganography scheme using overlapping block-based pixel-value differencing

This paper presents a steganographic scheme based on the RGB colour cover
image. The secret message bits are embedded into each colour pixel
sequentially by the pixel-value differencing (PVD) technique. PVD
basically works on two consecutive non-overlapping components; as a
result, the straightforward conventional PVD technique is not applicable
to embed the secret message bits into a colour pixel, since a colour pixel
consists of three colour components, i.e. red, green and blue. Hence, in
the proposed scheme, initially the three colour components are represented
into two overlapping blocks like the combination of red and green colour
components, while another one is the combination of green and blue colour
components, respectively. Later, the PVD technique is employed on each
block independently to embed the secret data. The two overlapping blocks
are readjusted to attain the modified three colour components. The notion
of overlapping blocks has improved the embedding capacity of the cover
image. The scheme has been tested on a set of colour images and
satisfactory results have been achieved in terms of embedding capacity and
upholding the acceptable visual quality of the stego-image.