Input: secret image A of size (n, m) and secret image B of size (n, m)
Output: share s1 of size (n, m + 1), share s2 of size (n, m)
1. Define zero matrix S of size (n, 1)
2. For j = 1 to m do
3. For i = 1 to n do
4. a = nearest retardation to Ai,j of the eight retardations in Lab color space
5. b = nearest retardation to Bi,j of the eight retardations in Lab color space
6. While 
not in [−1120, 1120]
7. 
8. 
9. 
10. 
11. 
12. For i = 1 to n do
13. Randomly set pixel 
to one of the eight retardations with a positive or negative sign.
14. For j = 1 to m do
15. For i = 1 to n do
16. 
17. 