![]() These straight waves have alternating crests and troughs. If a linear object attached to an oscillator bobs back and forth within the water, it becomes a source of straight waves. Ripple tank demonstrations are commonly done in a Physics class in order to discuss the principles underlying the reflection, refraction, and diffraction of waves. As the waves encounter obstacles in their path, their behavior can be observed by watching the movement of the dark and bright spots on the sheet of paper. As the water waves move through the ripple tank, the dark and bright spots move as well. So the bright spots represent wave troughs and the dark spots represent wave crests. A crest of water will absorb more light than a trough. A portion of light is absorbed by the water as it passes through the tank. A light typically shines upon the water from above and illuminates a white sheet of paper placed directly below the tank. A ripple tank is a large glass-bottomed tank of water that is used to study the behavior of water waves. The study of waves in two dimensions is often done using a ripple tank. But what if the wave is traveling in a two-dimensional medium such as a water wave traveling through ocean water? Or what if the wave is traveling in a three-dimensional medium such as a sound wave or a light wave traveling through air? What types of behaviors can be expected of such two- and three-dimensional waves? Specifically, there will be some reflection off the boundary and some transmission into the new medium. Rather, a wave will undergo certain behaviors when it encounters the end of the medium. The wave doesn't just stop when it reaches the end of the medium. The error bars represent the standard deviations between scenes.Previously in Lesson 3, the behavior of waves traveling along a rope from a more dense medium to a less dense medium (and vice versa) was discussed. c The PSNR and SSIM were evaluated for the FHD resolution dataset. OPT, NET, and qNET have similar PSNR values (29.0, 28.9, and 28.5 dB, respectively) and SSIM values (0.909, 0.910, and 0.894, respectively), while nCGH gives significantly lower PSNR (22.5 dB) and SSIM (0.756) values. The presented PSNR and SSIM values represent the mean values of all images in the dataset with respect to the 21 rendered images for each scene. b The PSNR and SSIM were evaluated for the 512 resolution dataset. The OPT inference time does not include the rendering time of the varifocal images. We achieved a frame rate of 62 Hz in qNET, which is 8600 (70) times faster than that obtained in OPT (nCGH). OPT refers to the DEH calculated by optimization, NET refers to the DEH calculated by DEHNet before quantization, and qNET refers to the DEH calculated by DEHNet. Moreover, to reduce the computational costs associated with rendering and optimizing, we also demonstrate a network-based synthetic method that requires only an RGB-D image.Ī Inference times. The proposed hologram is synthesized by optimizing a wave field to reconstruct numerous varifocal images after propagating the corresponding focal distances where the varifocal images are rendered using a physically-based renderer. Here, we propose a hologram that imitates defocus blur of incoherent light by engineering diffracted pattern of coherent light with adopting multi-plane holography, thereby offering real world-like defocus blur and photorealistic reconstruction. The coherent properties severely distort depth perception, the core of holographic displays to realize 3D scenes beyond 2D displays. ![]() However, owing to the limited resolution of spatial light modulators compared to static holograms, reconstructed objects exhibit various coherent properties, such as content-dependent defocus blur and interference-induced noise. Holography is one of the most prominent approaches to realize true-to-life reconstructions of objects. ![]()
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11/15/2023 11:48:52 pm
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