The Proposed Hierarchical (k, k) VSS Scheme (EXAMPLE : A Two-Layer (4, 4) Scheme )

B&W pixels are divided into 4 sub pixels in a two-layer (4, 4) scheme

shared

secret picture

S 1

S 12

S 11

S 2

S 21

S 22

Layer 1 :

(2, 2) scheme

Layer 2 :

(2, 2) scheme

Two-layer (4, 4) scheme including

two (2, 2) schemes

b&w

half and half

b&w

half and half

b&w

half and half

b&w

half and half

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