The image multiple secret sharing schemes without pixel expansion

In this paper, two secret sharing schemes were proposed. The two schemes both have the characteristic that the share images they produced are with no pixel expansion. In encoding phase, the rotated share scheme creates two share images for hiding three secret images, whereas the Exclusive OR rotated scheme achieve three share images for hiding four secret images. In decoding phase, the first scheme get secret information by stacking images and rotating image with different angles (0°, 90°, 180°). The second scheme get secret information by doing XOR operation, stacking, and rotating image with different angles (0°, 90°, 180°, 270°). Compare with other schemes of Visual Cryptography, our schemes not only increase the quantity of secret information, but also enhance quality of share image without increasing embed data.