Abstract

Optical image encryption topology is proposed based on the principle of random-phase encoding. Various encryption topological units, involving peer-to-peer, ring, star, and tree topologies, can be realized by an optical 6f system. These topological units can be interconnected to constitute an optical image encryption network. The encryption and decryption can be performed in both digital and optical methods.

© 2009 Optical Society of America

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References

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Figures (3)

Fig. 1
Fig. 1

Architecture of optical image encryption topology.

Fig. 2
Fig. 2

Optical setup to realize optical image encryption topology.

Fig. 3
Fig. 3

(a) A 0 and (b) B 0 . Phase distributions of (c), RPM1, (d) RPM2, and (e) RPM3.

Equations (8)

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B 0 ( x , y ) exp [ i φ ( x , y ) ] = I 1 [ B 0 ( ξ , η ) ] ,
B 0 k ( x , y ) exp [ i φ k ( x , y ) ] = I 1 { I { A 0 ( x , y ) exp [ i θ k ( x , y ) ] } exp [ i ϕ k ( u , v ) ] } ,
ϕ k + 1 ( u , v ) = angle ( I { B 0 ( x , y ) exp [ i φ k ( x , y ) ] } I { A 0 ( x , y ) exp [ i θ k ( x , y ) ] } ) ,
θ k + 1 ( x , y ) = angle ( I 1 { I { B 0 ( x , y ) exp [ i φ k ( x , y ) ] } exp [ i ϕ k + 1 ( u , v ) ] } ) ,
γ k ( x , y ) = φ ( x , y ) φ k ( x , y ) .
B 0 k = I [ I 1 { I [ A 0 exp ( i θ k ) ] exp ( i ϕ k ) } exp ( i γ k ) ] .
A 0 = | I 1 { I [ I 1 ( B 0 ) exp ( i γ k ) ] exp ( i ϕ k ) } | .
A 0 i k = I [ I 1 { I [ f i exp ( i θ i k ) ] exp ( i ϕ i k ) } exp ( i γ i k ) ] .

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