Video signal

The following parameters are established on the basis of the video signal of the radioscopic image ... 

Contrast Sensitivity S For this purpose a test piece is used whose least material thickness to be resolved in the video signal corresponds to the contrast sensitivity. The test piece can be a step/hole image quality indicator as per EN 462-2. 

An X-ray image of a test object is converted by a X-ray TV unit (4), and complete video-signal from it is supplied to specialized computer (5). For conversion of X-ray images series X-ray vidicons LI-444 and LI-473 can be used or experimental X-ray vidicons of the same dimensions with a Be input window [2] sensitive to soft X-radiation developed in Introscopy Institute. >. ... 

In a hardware analogy, many different classes of device generate a video signal and many different implementations accept it. Each of those devices (such as a monitor or projector) has other interfaces as well. 

In most acoustic microscopes the video signal is measured after detection by an envelope detector, so that the phase information has been lost. In order to attempt to reconstruct P(6)R(6) from a modulus only V(z) it is necessary to employ a phase retrieval algorithm (Fright et al. 1989). The method is based on the Gerchberg-Saxton algorithm (Gerchberg and Saxton 1972 Bates and McDonnell 1986). With the change of variables of (8.2) and with... 

In the larger, extended-range version the weapon can be dropped from one aircraft and then locked on to its objective by another, using the data link to carry video signals in one direction and positioning commands for the camera in the other... 

In 1980, video signals were carried by optical fibers 2 4 miles (4 kilometers) for the Winter Olympic Games in Lake Placid, New Yotk. The first long-haul intercity installations (AT T, Washington-New York New York-Boston) were made in 1983. After that, the capacity of fiber optic transmission systems increased exponentially. Despite this progress, the fundamental limits predicted by the physics of photonics materials, devices, and systems have not yet been approached (Kogelnik). The challenge of future research and development continues to be a fuller exploitation of the ultimate capacity of optical fibers. 

Connecting terminals to hosts appears to be the most widely used area for broadband. Allows the same channel to carry voice and video signals. The signal rates for broadband are not impressive for data communications at this time under 1 million bits per second for most applications ... 

Oriented polymers will no longer show a symmetric scattering pattern. For such systems a two dimensional detector is necessary. A commercial data aquisition system (Westinghouse), based on a Vidicon tube, is shown in Fig. 32. The video signal... 

Fig. 18 reproduces the MTF curve of an 80 mm SIT-tube with a fiber optic faceplate (RCA (21146)). Plotted is the modulation, in precentage, of the video signal as a result of the projection of a test mask, showing bursts of dark-light bars with increasing spatial frequency. 

Artek market a range of image analyzers. The Artek Omnicon 3600 is an advanced, easy to use system with turnkey application software. A precision scanner converts optical images into video signals that are presented on a high resolution monitor screen. The required measurement is selected from more than 20 parameters. The measure key is pushed and the answer appears ready to be printed out, saved or exported to any of a wide range of data bases and spreadsheet programs... 

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