Two-in-One Secret Image Sharing Scheme with Higher Visual Quality of the Previewed Image

Secret image sharing (SIS) scheme is a secret encoding and decoding that reconstructs the only if number of participants sufficient. In contrast, inadequate gain no information about image. Two-in-one (TiOSIS) kind SIS with two options, quick preview without computation accurate recovery computer. For higher speed, Li et al. proposed an improved two-in-one scheme, utilizing Boolean operation for less computational complexity, where visual quality previewed deteriorated. this paper, we use q-bit gray cryptography to build mathematical model better based on al.’s TiOSIS scheme. The black sub-pixels shadows corresponding pixel are replaced by grayscale value rather than 8-bit q positive integer smaller 8. theoretical analysis experiments exhibited guarantee feasibility effectiveness