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Computer-generated holography
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Computer-generated holography
Computer-generated holography (CGH) is a technique that uses computer algorithms to generate holograms. It involves generating holographic interference patterns. A computer-generated hologram can be displayed on a dynamic holographic display, or it can be printed onto a mask or film using lithography. When a hologram is printed onto a mask or film, it is then illuminated by a coherent light source to display the holographic images.
The term "computer-generated holography" has become used to denote the whole process chain of synthetically preparing holographic light wavefronts suitable for observation. If holographic data of existing objects is generated optically and recorded and processed digitally, and subsequently displayed, this is termed CGH as well.
Compared to classical holograms, computer-generated holograms have the advantage that the objects that one wants to show do not have to possess any physical reality, and can be completely synthetically generated.
Ultimately, computer-generated holography might expand upon all the roles of current computer-generated imagery. Holographic computer displays might be used for a wide range of applications, for example computer-aided design (CAD), gaming, and holographic video.
Holography is a technique originally invented by Hungarian physicist Dennis Gabor (1900–1979) to improve the resolving power on electron microscopes. An object is illuminated with a coherent (usually monochromatic) light beam; the scattered light is brought to interference with a reference beam of the same source, recording the interference pattern. CGH as defined in the introduction has broadly three tasks:
Note that it is not always justified to make a strict distinction between these steps; however it helps the discussion to structure it in this way.
Computer generated holograms offer important advantages over optical holograms since there is no need for a real object. Because of this breakthrough, a three-dimensional display was expected when the first algorithms were reported at 1966.
Unfortunately, the researchers soon realized that there are noticeable lower and upper bounds in terms of computational speed and image quality and fidelity respectively. Wavefront calculations are computationally very intensive; even with modern mathematical techniques and high-end computing equipment, real-time computation is tricky. There are many different methods for calculating the interference pattern for a CGH. In the following 25 years, many methods for computer-generated holograms were proposed in the fields of holographic information and computational reduction as well as in computational and quantization techniques. The algorithms can be categorized in two main concepts: Fourier transform holograms and point source holograms.
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Computer-generated holography
Computer-generated holography (CGH) is a technique that uses computer algorithms to generate holograms. It involves generating holographic interference patterns. A computer-generated hologram can be displayed on a dynamic holographic display, or it can be printed onto a mask or film using lithography. When a hologram is printed onto a mask or film, it is then illuminated by a coherent light source to display the holographic images.
The term "computer-generated holography" has become used to denote the whole process chain of synthetically preparing holographic light wavefronts suitable for observation. If holographic data of existing objects is generated optically and recorded and processed digitally, and subsequently displayed, this is termed CGH as well.
Compared to classical holograms, computer-generated holograms have the advantage that the objects that one wants to show do not have to possess any physical reality, and can be completely synthetically generated.
Ultimately, computer-generated holography might expand upon all the roles of current computer-generated imagery. Holographic computer displays might be used for a wide range of applications, for example computer-aided design (CAD), gaming, and holographic video.
Holography is a technique originally invented by Hungarian physicist Dennis Gabor (1900–1979) to improve the resolving power on electron microscopes. An object is illuminated with a coherent (usually monochromatic) light beam; the scattered light is brought to interference with a reference beam of the same source, recording the interference pattern. CGH as defined in the introduction has broadly three tasks:
Note that it is not always justified to make a strict distinction between these steps; however it helps the discussion to structure it in this way.
Computer generated holograms offer important advantages over optical holograms since there is no need for a real object. Because of this breakthrough, a three-dimensional display was expected when the first algorithms were reported at 1966.
Unfortunately, the researchers soon realized that there are noticeable lower and upper bounds in terms of computational speed and image quality and fidelity respectively. Wavefront calculations are computationally very intensive; even with modern mathematical techniques and high-end computing equipment, real-time computation is tricky. There are many different methods for calculating the interference pattern for a CGH. In the following 25 years, many methods for computer-generated holograms were proposed in the fields of holographic information and computational reduction as well as in computational and quantization techniques. The algorithms can be categorized in two main concepts: Fourier transform holograms and point source holograms.