Visual Cryptography and Secret Image Sharing

Index

A

ABPs, see Auxiliary black pixels

Additive color model, 34

Alignment problem, 297-326

average contrast, 301

basis matrices, 300

black pixel, ineffective, 306

block length, 300

darkness thresholds, 300

discussions, 325

Hamming weights, 301, 303

misalignment deviation, 316

misalignment tolerant VCS, 319-325

algorithm, 319-322

decrypting algorithm, 321

encrypting algorithm, 320

simulations, 322-325

misalignment with integer number of subpixels, 302-309

misalignment with less than one subpixel, 309-319

large subpixels have better misalignment tolerance, 316-319

shares with slightly misalignment can still recover secret image, 310-315

nonzero coordinates, 299

original secret image, 299

pixel expansion, 297, 298

preliminaries, 299-301

recovered ...