Spatial integrating optical correlator for verifying the authenticity of a person, product or thing

A method of verifying the authenticity of an object, the method comprising the steps of:

• associating an input mask with the object, said input mask includes a two dimensional function N(x,y);
• providing a spatial integrating optical correlator having an input plane and an output plane;
• scanning in one dimension said input mask with a light source to generate an input image at said input plane of said correlator;
• projecting said input image at a reference mask in the spatial domain to generate a spatially integrated correlation image at said output plane of said correlator,
• said reference mask includes a two dimensional function M.sub.SDF (x,y) which includes possible shifts in the y-direction and is defined by, ##EQU6## where m.sub.0 is the severity of misalignment in a y-direction for a system designed to detect a two dimensional function M(x,y) by one dimensional correlation;
• said correlation image has a function defined by,
• R(x',y.sub.0)=.intg..intg.N(x-x', y-y.sub.0)M.sub.SDF (x,y)dxdy;
• detecting said correlation image to provide a correlation signal indicative of said correlation image;
• and
• comparing said correlation signal to at least one threshold level to verify to the authenticity of the object.

An apparatus for verifying the authenticity of an object having an input mask coupled thereto, comprising:

• a partially coherent light source;
• means for scanning in one dimension said input mask with said light source to generate an input image, said input mask includes a two dimensional function N(x,y);
• a reference mask including a two dimensional function M.sub.SDF (x,y) which includes possible shifts in the y-direction and is defined by, ##EQU7## where m.sub.0 is the severity of misalignment in a y-direction for a system designed to detect a two dimensional function M(x,y) by one dimensional correlation;
• means for projecting said input image at said reference mask in the spatial domain to generate a spatially integrated correlation image having a function defined by,
• R(x',y.sub.0)=.intg..intg.N(x-x',y-y.sub.0)M.sub.SDF (x,y)dxdy;
• means for detecting said correlation image to provide a correlation signal indicative of said correlation image;
• and
• means for comparing said correlation signal to a threshold level to verify to the authenticity of the object.

An apparatus for verifying the authenticity of an object having an input mask coupled thereto, comprising:

• a partially coherent light source;
• a spatial integrating optical correlator having an input plane and an output plane;
• means for scanning in one dimension said input mask with said light source to generate an input image at said input plane of said correlator, said input mask includes a two dimensional function N(x,y);
• a reference mask including a two dimensional function M.sub.SDF (x,y) which includes possible shifts in the v-direction and is defined by, ##EQU8## where m.sub.0 is the severity of misalignment in a y-direction for a system designed to detect a two dimensional function M(x,y) by one dimensional correlation;
• means for projecting said input image at said reference mask in the spatial domain to generate a spatially integrated correlation image at said output plane of said correlator, said correlation image has a function defined by ,
• R(x'y.sub.0)=.intg..intg.N(x-x',y-y.sub.0)M.sub.SDF (x,y)dxdy;
• means for detecting said correlation image to provide a correlation signal indicative of said correlation image;
• and
• means for comparing said correlation signal to at least one threshold level to verify to the authenticity of the object.

A method of verifying the authenticity of an object, the method comprising the steps of:

• converting a biometric signature into a first mask including a one dimensional function f(x);
• bonding a second mask to said first mask to form an input mask, wherein said input mask is a composite mask, said second mask including a one dimensional function M(x), said one dimensional function M(x) is defined by,
• M(x)=e.sup.i.phi..sbsp.m.sup.(x)
• where .phi.m(x) is a random function, whereby said composite mask includes a one dimensional function g(x), said function g(x) being defined by,
• g(x)=f(x)M(x);
• associating said input mask with the object;
• scanning in one dimension said input mask with a light source to generate an input image;
• projecting said input image at a reference mask in the spatial domain to generate a spatially integrated correlation image, said reference mask including a one dimensional function M*(x), where * is the complex conjugate, and said correlation image has a function R(x) defined by,
• R(x)=.intg.M*(x-x')g(x)dx;
• detecting said correlation image to provide a correlation signal indicative of said correlation image;
• and
• comparing said correlation signal to at least one threshold level to verify to the authenticity of the object.

A method of verifying the authenticity of an object, the method comprising the steps of:

• converting a biometric signature into a first mask including a one dimensional function f(x);
• and
• bonding a second mask to said first mask to form an input mask, wherein said input mask is a composite mask, said second mask including a one dimensional function M(x), said one dimensional function M(x) is defined by,
• M(x)=e .sup.i.phi..sbsp.m.sup.(x)
• where .phi..sub.m (x) is a random function, whereby said composite mask includes a one dimensional function g(x), said function g(x) being defined by,
• g(x)=f(x)M(x);
• associating an input mask with the object;
• providing a spatial integrating optical correlator having an input plane and an output plane;
• scanning in one dimension said input mask with a light source to generate an input image at said input plane of said correlator;
• projecting said input image at a reference mask in the spatial domain to generate a spatially integrated correlation image at said output plane of said correlator, said reference mask includes a one dimensional function M*(x), where * is the complex conjugate, and said correlation image has a function R(x) defined by,
• R(x)=.intg.M*(x-x')g(x)dx;
• detecting said correlation image to provide a correlation signal indicative of said correlation image;
• and
• comparing said correlation signal to at least one threshold level to verify to the authenticity of the object.

An apparatus for verifying the authenticity of an object comprising:

• a first mask including a biometric signature, said first mask including a one dimensional function f(x);
• a second mask bonded to said first mask to form an input mask, wherein said input mask is a composite mask and is associated with the object, said second mask including a one dimensional function M(x), said one dimensional function M(x) is defined by,
• M(x)=e.sup.i.phi..sbsp.m.sup.(x)
• where .phi..sub.m (x) is a random function, whereby said composite mask includes a one dimensional function g(x), said function g(x) being defined by,
• g(x)=f(x)M(x);
• a partially coherent light source;
• means for scanning in one dimension said input mask with said light source to generate an input image;
• a reference mask including a one dimensional function M*(x), where * is the complex conjugate;
• means for projecting said input image at said reference mask in the spatial domain to generate a spatially integrated correlation image, said correlation image has a function R(x)defined by,
• R(x)=.intg.M*(x-x')g(x)dx;
• means for detecting said correlation image to provide a correlation signal indicative of said correlation image;
• and
• means for comparing said correlation signal to a threshold level to verify to the authenticity of the object.

An apparatus for verifying the authenticity of an object comprising:

• a first mask including a biometric signature, said first mask including a one dimensional function f(x);
• a second mask bonded to said first mask to form said input mask, wherein said input mask is a composite mask and is associated with the object, said second mask includes a one dimensional function M(x), said one dimensional function M(x) is defined by,
• M(x)=e.sup.i.phi..sbsp.m.sup.(X)
• where .phi..sub.m (x) is a random function, whereby said composite mask includes a one dimensional function g(x), said function g(x) being defined by,
• g(x)=f(x)M(x);
• a partially coherent light source;
• a spatial integrating optical correlator having an input plane and an output plane;
• means for scanning in one dimension said input mask with said light source to generate an input image at said input plane of said correlator;
• a reference mask including a one dimensional function M*(x), where * is the complex conjugate;
• means for projecting said input image at said reference mask in the spatial domain to generate a spatially integrated correlation image at said output plane of said correlator, said correlation image has a function R(x)defined by,
• R(x)=.intg.M*(x-x')g(x)dx;
• means for detecting said correlation image to provide a correlation signal indicative of said correlation image;
• and
• means for comparing said correlation signal to at least one threshold level to verify to the authenticity of the object.

A method of verifying the authenticity of an object, the method comprising the steps of:

• converting a biometric signature into a first mask, said first mask includes a two dimensional function f(x,y);
• bonding a second mask to said first mask to form an input mask, wherein said input mask is a composite mask, said second mask includes a two dimensional function M(x,y), said two dimensional function M(x,y) is defined by,
• M(x,y)=e .sup.i.phi..sbsp.m.sup.(x,y)
• where .phi..sub.m (x,y) is a random function, whereby said composite mask includes a two dimensional function g(x,y), said function g(x,y) being defined by,
• g(x,y)=f(x,y)M(x,y);
• associating said input mask with the object;
• scanning in one dimension said input mask with a light source to generate an input mask image;
• projecting said input image at a reference mask in the spatial domain to generate a spatially integrated correlation image, said reference mask includes a two dimensional function M*(x,y), where * is the complex conjugate, and said correlation image has a function R(x,y) defined by,
• R(x,y)=.intg..intg.M*(x-x',y-y')g(x,y)dxdy;
• detecting said correlation image to provide a correlation signal indicative of said correlation image;
• and
• comparing said correlation signal to at least one threshold level to verify to the authenticity of the object.

A method of verifying the authenticity of an object, the method comprising the steps of:

• converting a biometric signature into a first mask, said first mask including a two dimensional function f(x,y);
• bonding a second mask to said first mask to form input mask, wherein said input mask is a composite mask, said second mask includes a two dimensional function M(x,y), said two dimensional function M(x,y) is defined by,
• M(x,y)=e.sup.i.phi..sbsp.m.sup.(x,y)
• where .phi..sub.m (x,y) is a random function, whereby said composite mask includes a two dimensional function g(x,y), said function g(x,y) being defined by,
• g(x,y)=f(x,y)M(x,y);
• associating an input mask with the object;
• providing a spatial integrating optical correlator having an input plane and an output plane;
• scanning in one dimension said input mask with a light source to generate an input image at said input plane of said correlator,
• projecting said input image at a reference mask in the spatial domain to generate a spatially integrated correlation image at said output plane of said correlator, said reference mask includes a two dimensional function M*(x,y), where * is the complex conjugate, and said correlation image has a function R(x,y) defined by,
• R(x,y)=.intg..intg.M*(x-x',y-y')g(x,y)dxdy;
• detecting said correlation image to provide a correlation signal indicative of said correlation image;
• and
• comparing said correlation signal to at least one threshold level to verify to the authenticity of the object.

An apparatus for verifying the authenticity of an object comprising:

• a first mask including a biometric signature, said first mask includes a two dimensional function f(x,y);
• a second mask bonded to said first mask to form an input mask, wherein said input mask is a composite mask and is associated with the object, said second mask includes a two dimensional function M(x,y), said two dimensional function M(x,y) is defined by,
• M(x,y)=e.sup.i.phi..sbsp.m.sup.(x,y)
• where .phi..sub.m (x,y) is a random function, whereby said composite mask includes a two dimensional function g(x,y), said function g(x,y) being defined by,
• g(x,y)=f(x,y)M(x,y);
• a partially coherent light source;
• means for scanning in one dimension said input mask with said light source to generate an input image;
• a reference mask including a two dimensional function M*(x,y) where * is the complex conjugate;
• means for projecting said input image at said reference mask in the spatial domain to generate a spatially integrated correlation image, said correlation image has a function R(x,y) defined by,
• R(x,y)=.intg..intg.M*(x-x',y-y')g(x,y)dxdy;
• means for detecting said correlation image to provide a correlation signal indicative of said correlation image;
• and
• means for comparing said correlation signal to a threshold level to verify to the authenticity of the object.

An apparatus for verifying the authenticity of an object comprising:

• a first mask including a biometric signature, said first mask including a two dimensional function f(x,y);
• a second mask bonded to said first mask to form an input mask, wherein said input mask is a composite mask and is associated with the object, said second mask includes a two dimensional function M(x,y), said two dimensional function M(x,y) is defined by,
• M(x,y)=e.sup.i.phi..sbsp.m.sup.(x,y)
• where .phi..sub.m (x,y) is a random function, whereby said composite mask includes a two dimensional function g(x,y), said function g(x,y) being defined by,
• g(x,y)=f(x,y)M(x,y);
• a partially coherent light source;
• a spatial integrating optical correlator having an input plane and an output plane;
• means for scanning in one dimension said input mask with said light source to generate an input image at said input plane of said correlator;
• a reference mask including a two dimensional function M*(x,y), where * is the complex conjugate,
• means for projecting said input image at said reference mask in the spatial domain to generate a spatially integrated correlation image at said output plane of said correlator, said correlation image has a function R(x,y) defined by,
• R(x,y)=.intg..intg.M*(x-x',y-y')g(x,y)dxdy;
• means for detecting said correlation image to provide a correlation signal indicative of said correlation image;
• and
• means for comparing said correlation signal to at least one threshold level to verify to the authenticity of the object.