Robust Visual Secret Sharing Scheme Applying to QR Code

Algorithm 1

Proposed robust VSS applying to QR codes.

Input: A binary secret QR code image ; different binary temporary QR code images ; different binary QR

code cover images ; the threshold parameters ; the error correction characteristics

Output:   grayscale shares

Generate grayscale shares by graying binary QR code images .

Averagely and randomly divide the serial of total codewords into subsets denoted as , and the number of

each set is , where .

Serial v of the codeword in the secret image S is denoted as , and the serial v of the codeword in the is denoted as .

  for   to   do

for each codeword v in   do

  if     then

Modify the codeword of binary QR code image as ;

  end if

(9)   end for

(10)   end for

  for   to   do

Replace the second significant bit plane of grayscale QR code image with the modified QR code image , and

replace the last six significant bit planes with random binary numbers to generate grayscale share .

  end for

Output grayscale shares .