Figure 14 - available via license: CC BY
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Composite image using a proper cyclorama calibration. Note the defined edges of the actor's green jersey and the absence of artifacts on the composition (a). Composite image with a non-homogeneous background lighting (b). Note the transparencies in the green jersey, the blurred edges and the halos appearing in the neck of the actor. Modifying the chroma-keying threshold in order to reduce the undesired transparencies increases the halos and makes different artifacts appear in the background due to the illumination differences in the cyclorama.
Source publication
A virtual TV set combines actors and objects with computer-generated virtual environments in real time. Nowadays, this technology is widely used in television broadcasts and cinema productions. A virtual TV set consists of three main elements: the stage, the computer-system and the chroma-keyer. The stage is composed by a monochrome cyclorama (the...
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Citations
... Nevertheless, for our implemented 40 pixels FWHM beam diameter, the impact of the relative phase and the Lissajous pattern factor γ on c V remains negligible. Considering an acceptable homogeneous illumination for c V < 0.25 [33], an amplitude oscillation angle up to A = B = 4.4 • is achievable. ...
Terahertz technologies are attracting strong interest from high-end industrial fields, and particularly for non-destructive-testing purposes. Currently lacking compactness, integrability as well as adaptability for those implementations, the development and commercialisation of more efficient sources and detectors progressively ensure the transition toward applicative implementations, especially for real-time full-field imaging. In this work, a flexible illumination system, based on fast beam steering has been developed and characterized. Its primary goal is to suppress interferences induced by the coherence length of certain terahertz sources, spoiling terahertz images. The second goal is to ensure an enhanced signal-to-noise ratio on the detector side by the full use and optimized distribution of the available power. This system provides a homogeneous and adjustable illumination through a simplified setup to guarantee optimum real-time imaging capabilities, tailored to the sample under inspection. Working toward industrial implementations, different illumination process are conveniently assessed as a result of the versatility of this method.