Proposal of an Asymptotically Contrast-Ideal (t, n)- Threshold Visual Secret Sharing Scheme. - Hiroki Koga; Etsuyo Ueda (ISIT, 2006)

Basic Properties of the (t, n)-Threshold Visual Secret Sharing Scheme with Perfect Reconstruction of Black Pixels. - Hiroki Koga; Etsuyo Ueda (Des. Codes Cryptogr., 2006)