Novel Lossless Morphing Algorithm for Secret Sharing via Meaningful Images

Image morphing algorithms create an intermediate image that resembles both the source image and the target image simultaneously. Most existing morphing algorithms incur information loss, thus, they cannot reconstruct the original images accurately. This paper proposes a novel, lossless image morphing (LIM) algorithm, designed so that the original image can be losslessly reconstructed from the morphed image. Additionally, the proposed LIM algorithm is used for secret image sharing in which the shares are generated by the image morphing operation. The shares are high-quality, natural images, and the secret image can be losslessly reconstructed, under the condition that all of the shareholders work cooperatively. Due to non-linear warping in the LIM algorithm, the proposed secret image sharing scheme is unconditionally secure.