Video overlay systems

Boeckeler manufacture simple systems which require more operator input but are less expensive than more automated systems. The VlA-20 Video Image Marker ean be used to mark details on a video image the VIA-50 includes a more varied array of positionable markers with an option for multiple overlay storage the VIA-100 can perform horizontal, vertical and point-to-point measurements, and the VIA-150 combines the capabilities of the VIA-50 and VIA-100. The VIA-160A1 video area measurement system can be combined with a video microscopy system to give cell areas, chord lengths and number counts. 

Multiple sets of CRT-based projection systems can be linked to increase luminance and resolution for a given appHcation. The multiple beams overlay each other to yield the improved performance. Convergence of the 6-12 CRT assemblies, however, can become quite complex. Multiple CRT systems are satisfactory for NTSC video sources, but are usually inadequate for the display of computer-generated graphics data with single pixel characters. 

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