An improved threshold multi-level image recovery scheme

Nowadays, publishing photos over social network is very popular. In order to obtain more benefit, the new business model is design. For example, the photo should be browsed, or downloaded according to different level. Specifically, a single user only obtains the low quality image, but if he recommends more users to join in, more higher quality image can be obtained. In this paper, an improved (t, r, n)-hierarchical threshold multi-level image recovery scheme is proposed. When the number of collaborators is less than t, the browsed image's quality is gradually improved with the increasement of the number of collaborators. If the number of the collaborators reaches t, the complete image is obtained. Moreover, system analysis shows that the proposed scheme achieves the steganography and practicability.