By Takashi Matsuyama, Shohei Nobuhara, Takeshi Takai, Tony Tung
This publication offers a large evaluate of cutting-edge 3D video construction applied sciences and purposes. The textual content opens with a concise advent to the sector, ahead of reading the layout and calibration equipment for multi-view digital camera platforms, together with useful implementation applied sciences. a number algorithms are then defined for generating 3D video from video facts. a variety of 3D video functions also are proven. good points: describes real-time synchronized multi-view video trap, and item monitoring with a bunch of energetic cameras; discusses geometric and photometric digicam calibration, and 3D video studio layout with lively cameras; examines 3D form and movement reconstruction, texture mapping and picture rendering, and lighting fixtures setting estimation; demonstrates beautiful 3D visualization, visible contents research and enhancing, 3D physique motion research, and information compression; highlights the remainder demanding situations and the interesting avenues for destiny study in 3D video technology.
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Extra resources for 3D Video and Its Applications
Moreover, image sensor sensitivity and electronic circuit characteristics vary from camera to camera even if they are of the same type, making color calibration of multicamera systems much harder. Vignetting: Ordinary lens systems introduce vignetting: central areas of an image become brighter than peripheral areas. That is, the latter can receive less light rays compared to the former due to (1) multiple optical elements in a lens system (optical vignetting) and (2) the angle of incoming light (natural vignetting by the cosine fourth law).
As is well known, since RGB values denote spectral integrals, the accuracy of the above-mentioned RGB-based color calibration is limited. Thus, physics-based color calibration should be employed to attain the truly absolute color calibration: estimate spectral filtering characteristics of RGB channels from a reference pattern and a light source whose spectral radiance and radiant characteristics are known, respectively. To evaluate the usability of standard color samples, such as Munsell standard colors, in the physics-based color calibration, we measured spectral characteristics of radiance intensities of 1,016 color samples lit by a standard light, where spectral characteristics of each color sample is represented by 176 radiance intensity values from 380 nm to 730 nm with 2 nm sampling pitch.
That is, the three coordinate systems of cameras A, B, and C are integrated into the common coordinate system with one scale factor. By iteratively applying this method for the other cameras one by one, we can describe all the camera positions and postures in the camera A coordinate system with a scale factor. Notice that this process obviously accumulates calibration errors through the iteration. However, this is not a serious problem since the following non-linear optimization will reduce these errors.
3D Video and Its Applications by Takashi Matsuyama, Shohei Nobuhara, Takeshi Takai, Tony Tung
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