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Chapter 6:
Innovative Holographic Approaches for High-Resolution Image Reconstruction
At its essence, holography is the recording of a wavefront on photographic film and the regeneration of the wavefield from the recording. The technique was first invented by Dennis Gabor in 1947 to correct the spherical aberration of the electronic microscope. Many researchers followed Gabor and ventured out as pioneers of this intrinsic field. One of these pioneers was Emmett Leith who, with Juris Upatnieks, realized the holographic principle for wavefront reconstruction using a tilted reference wave. Holograms made with this technique were later termed “first-order holograms.” Later, as a consequence of the development of the SAR, another wave of innovation arrived to holography in which the quality of the recorded images was significantly improved. Its wide set of applications was broadened to include broad-spectrum recording, volume holography, holographic stereograms and multiplex holograms. This chapter honors the leadership and significant contributions of Emmett Leith and Yuri Denisyuk to the scientifically thrilling and industrially promising field of holography by presenting some recent research on approaches that enhance the image resolution under nonideal conditions. Section 6.2 explores wavelet encoding as a possible way of reconstructing holograms illuminated by broad sources. Section 6.3 presents a multiplexing technique that preserves the 3D information under spatially incoherent reconstruction illumination. Sections 6.4 and 6.5 address the viewing of highly resolved images through a turbolentic or scatering medium, where Section 6.4 explores the first-arriving light approach and Section 6.5 uses the triple correlation image-processing tool to obtain the desired images. Section 6.6 deals with sythetic aperture radar (SAR) related technique for superresolution.
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