By Yann Frauel, Enrique Tajahuerce, Osamu Matoba, Albertina Castro, Bahram Javidi (auth.), Bahram Javidi (eds.)
Optical and photonic structures and units have major strength for native land protection. Optical Imaging Sensors and platforms for place of origin protection purposes offers unique and demanding technical contributions from leaders of undefined, executive, and academia within the box of optical and photonic sensors, structures and units for detection, identity, prevention, sensing, safeguard, verification and anti-counterfeiting. The chapters have contemporary and technically major effects, plentiful illustrations, figures, and key references. This booklet is meant for engineers and scientists within the proper fields, graduate scholars, managers, college professors, govt managers, and coverage makers.
Advanced Sciences and applied sciences for defense purposes makes a speciality of learn monographs within the parts of
-Recognition and identity (including optical imaging, biometrics, authentication, verification, and shrewdpermanent surveillance systems)
-Biological and chemical risk detection (including biosensors, aerosols, fabrics detection and forensics), and
-Secure info platforms (including encryption, and optical and photonic systems).
The sequence is meant to offer an summary on the maximum learn point of the frontier of analysis within the actual sciences.
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Additional info for Optical Imaging Sensors and Systems for Homeland Security Applications
Optical configuration for recording (a) for reconstruction and (b) of offaxis holograms. image. 13 The intensity distribution I (x, y) across the x-y holographic recording plane can be written as the modulus squared of O(x, y) þ R(x, y), namely I (x, y) ¼ jO(x, y) þ R(x, y)j2 ¼ jR(x, y)j2 þ jO(x, y)j2 þ RÃ (x, y)O(x, y) þ R(x, y)O Ã (x, y) (1) where the symbol * denotes the complex conjugate, O(x, y) ¼ jO(x, y)j exp [ifo (x, y)] is the complex amplitude of the object wave with real amplitude jO(x, y)j and phase fo (x, y) and R(x, y) ¼ jR(x, y)j exp [ifR (x, y)] is the complex amplitude of the reference wave with real amplitude jR(x, y)j and phase fR (x, y).
44,45 This introduces a third reason why compression of digital holograms differs from compression of digital images; a change locally in a digital hologram will, in theory, affect the whole reconstructed object. Furthermore, when gauging the errors introduced by lossy compression, we are not directly interested in the defects in the hologram itself, only how compression noise affects the quality of reconstructions of the compressed 3D object. 32,34 These holograms were encrypted by perturbing the Fresnel diffraction of the 3D objects with a random phase mask.
Although the applications reported do not involve specific security themes, the recent improvements of this coherent technique may be applied in the fields of biology, imaging, etc. where microscopy is required and thus they are certain to have an impact in Homeland Security. 1 Digital Holography Dennis Gabor invented holography in 1948 as a method for recording and reconstructing both the amplitude and the phase of an optical wavefront,1 with the objective of improving electron microscope images.