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| Author | : Chung-Kai Hsueh |
| Publisher | : |
| Total Pages | : 261 |
| Release | : 1979 |
| Genre | : Computer graphics |
| ISBN | : |
| Author | : Jay Schwartz |
| Publisher | : |
| Total Pages | : 44 |
| Release | : 1987 |
| Genre | : |
| ISBN | : |
| Author | : Steven F. Butler |
| Publisher | : |
| Total Pages | : 181 |
| Release | : 1986 |
| Genre | : |
| ISBN | : |
This report presents techniques for the use of computer-generated holograms (CGH) for matched filtering. An overview of the supporting technology is provided. Included are techniques for modifying existing CGH algorithms to serve as matched filters in an optical correlator. It shows that matched filters produced in this fashion can be modified to improve the signal-to-noise and efficiency over the possible with conventional holography. The effect and performance of these modifications are demonstrated. In addition, a correction of film nonlinearity in continuous-tone filter production is developed. Computer simulations provide quantitative and qualitative demonstration of theoretical principles, with specific examples validated in optical hardware. Conventional and synthetic holograms, both bleached and unbleached, are compared. Keywords include: Lasers, Holography, Matched Filters, and Computer-Generated Pattern Recognition.
| Author | : Stanford University. Stanford Electronics Laboratories |
| Publisher | : |
| Total Pages | : 154 |
| Release | : 1973 |
| Genre | : |
| ISBN | : |
Two new techniques for making computer generated spatial filters with high dynamic range and high light efficiency are described, and a general treatment of computer generated holograms is given. Examples of single-channel (continuous phase control) phase-only filters, binary phase-only filters, as well as the absorption-type filters have been realized experimentally. Experiments have been carried out for correcting blurred images and for character recognition. Finally, a ternary hologram (binary absorption and binary phase), which preserves advantages of both types of binary holograms but is capable of a higher dynamic range than either individually, has been realized experimentally using color film. (Modified author abstract).
| Author | : James R. Fienup |
| Publisher | : |
| Total Pages | : 218 |
| Release | : 1975 |
| Genre | : Coherence (Optics) |
| ISBN | : |
| Author | : Ian Mason Firth |
| Publisher | : Mills & Boon |
| Total Pages | : 78 |
| Release | : 1972 |
| Genre | : Computers |
| ISBN | : |
| Author | : |
| Publisher | : |
| Total Pages | : 222 |
| Release | : 1973 |
| Genre | : Government publications |
| ISBN | : |
Holography and optical filtering techniques for structural analysis, material tests, and astronomical observation - conference.
| Author | : Manoj Kumar |
| Publisher | : BoD – Books on Demand |
| Total Pages | : 162 |
| Release | : 2019-09-25 |
| Genre | : Technology & Engineering |
| ISBN | : 1789847885 |
Optical techniques continue to evolve and advance, particularly with the inventions of the laser and holography. This volume provides an introduction to various optical systems and devices that are increasingly being used for engineering, scientific, and industrial applications. Organized into three sections on Holographic Materials, Optical Systems, and Algorithms and Imaging Processing, this book covers basic concepts of holographic materials and systems. Chapters provide comprehensive information on volume holograms, display holograms, full-color holographic optical elements, computer-generated holograms, digital imaging devices, and image processing algorithms. This volume is intended for researchers in the field and interested readers alike.
| Author | : Sing H. Lee |
| Publisher | : |
| Total Pages | : 506 |
| Release | : 1992 |
| Genre | : Computer graphics |
| ISBN | : |
An important feature of computer generated holograms (CGHs) is to create wavefronts that may be defined only mathematically. Since A. W. Lohmann and his colleagues invented CGHs in 1966 for spatial filtering in image processing, the applications of CGHs have multiplied to include 3-D display, optical testing, diffractive/binary optics, bifocal intraocular lenses, wavefront transformations for material processing, pickup heads for optical disks, focal plane array detection, coherent laser addition, beam steering, and optical interconnects for parallel computing and neural computing. Today, the applications of CGHs continue to expand. This book features a selection of papers that examine different aspects of the development of CGHs from the 1960s through 1990, because there is no substitute for reading the original papers on any subject, even if that subject is mature enough to have many single-aspect monographs and textbooks. It is hoped that this selection of papers will be valuable additions to many working libraries on this expanding, expansive subject.
| Author | : Victor A. Soifer |
| Publisher | : CRC Press |
| Total Pages | : 228 |
| Release | : 1994-07-20 |
| Genre | : Science |
| ISBN | : 9780849324765 |
Laser Beam Mode Selection by Computer Generated Holograms brings attention to a new class of optical elements called modans, with applications in laser and fiber optics. Separation of the transverse modes by modans is discussed in close analogy to well-known effects of color separation by diffraction gratings. The book describes the basic questions of digital holography in the recording of complex wavefronts on phase-only media, binary coding cells, multilevel computer-generated holograms, quantization and sampling, image reconstruction, and computer generation of multifocal and multibeam holograms. This collective effort summarizes 12 years of scientific activities in the development of diffractive optical elements and provides considerable material never before published. An interesting appendix dedicates itself to mathematical proof of optimal properties of orthogonal base-functions and eigenfunctions.
