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.

AE (Auto Exposure): Combined use of AGC and iris motor control allows shooting in a broad range of lighting conditions. AGC amplifies the video signal in low light conditions, iris reduces it in high light conditions. Motor iris control can be replaced by the CCD IRIS control.

AF (Autofocus): Available in Cameras equipped with motorized focus, this feature provides automatic adjustment of the focus. AF operates by varying the focus to maximize the high frequency content of the central area of the picture by reference to high luminance and strong contrast elements. In some Cameras, AF can be set to High or Low sensitivity modes. AF mode is not recommended for continuous 24-hour operation. SEE also One-push AF, Interval AF, Zoom triggered AF.

AGC (Automatic Gain Control): Circuitry that automatically adjusts the electronic amplification of the video signal to compensate for varying levels of scene illumination.

Analogue Backlight comensation: Picture brightness adjusted automatically depending on lighting conditions. Overcomes the problem of strong backlight which often causes th subject of the picture to be cast into shadow.

Aliasing: Interference phenomenon which occurs when a sampled signal contains frequencies that are higher than half the sampling frequency. A CCD samples the picture spatially. An optical low-pass filter is used to avoid aliasing, especially in color applications.

Aperture correcton: Camera signal processing function which adjusts the enhancement of edges of objects in a picture.

Aperture/sharp mode: Makes object outlines in the pi

Aspect Ratio: The ratio of width over height of an image, 4:3 for a standard TV image, 16:9 for wide screen.

Asynchronous transmission mode: IEEE 1394 data transmission mode without a guaranteed data delivery time. Used in IEEE 1394 Cameras for control functions and reports.

ATW (Auto Tracking White balance): In ATW mode, white balance is continuously being adjusted according to the color temperature of the scene illumination.