SVSi | Scientific Vision Systems

Scientific Vision Systems (SVSi) is the leading supplier of scientific professional medical imaging equipment including medical printers, medical cameras, medical display monitors, & medical recorders for Endoscopy & Ultrasound, from top brand names as Sony, Hitachi, Panasonic, Tatung, Mitsubishi, National Displays, Double Black Imaging, and hard to find items. Also featuring the most complete glossary of medical digital imaging video electronic terms.

Gain: The electronic amplification factor of a signal.

Gamma: Correction law introduced in the camera output signal to compensate for the non-linearity of the CRT (Cathode Ray Tube) in video monitors. A typical gamma value is 0.45, which results in the brightness component of the CRT picture appearing to be linear.

Genlock: Circuitry that synchronizes one video signal to another video signal. There are three types of genlock: V-lock, HV-lock and full color.

V-lock is useful when simply switching from one B/W color source to another

HV-lock is used for full synchronization of B/W Cameras, and requires a HD+VD input, composite sync input or composite VS video signal input. In the case of color Cameras, this type of synchronization can be used when cutting between pictures, but not for mixing between them.

Full color genlock is used when pictures have to be mixed without color degradation. It needs VBS composite video input.