SenTech STC-400 SeriesL Manual de usuario descargar pdf (Pagina 25)

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GLOSSARY OF TERMS

Gamma – A numeric value, or the degree of contrast in a video image. Standard video accessories, (monitors, VCRs,

consumer frame grabbers, etc.) are usually set for a gamma value of 0.45. Machine Vision applications and industrial level

frame grabbers usually require a gamma value of 1.0.

Lens Mount – The two styles (sizes) of lens mount that are most common for commercial / industrial applications are

C-mount and CS-mount.

C-Mount Flange back of 17.526mm, 1 inch in diameter, 32 threads per inch

CS-Mount Flange back of 12.5mm, 1 inch in diameter, 32 threads per inch

(CS-Mounts can be converted to C-Mount with a 5mm adapter ring.)

Minimum Illumination – The measurement of the camera’s capability to generate a useful image in low light conditions.

The industry standard method of determining the minimum illumination is to measure the level of light when the camera

has an F1.2 lens with the gain ON at a 50 IRE video signal output. Boosting the gain or lowering the IRE level when testing

will result in exaggerated performance specifications.

Synchronization – Sync is the ability of the camera to line up the data being processed in such a way that the camera

generates an image that is not “torn,” “skipping” or “skewed” in appearance. Internal Sync is when the camera is running in

a standalone mode and “lining up” the timing data by itself. External Sync is when the camera is “sharing” timing data with

a second or external device (i.e.: a second camera, a frame grabber, a digital recorder, etc.) so that the output of the signal is

synchronized with the external device as required by the application.

HD/VD – Horizontal Drive / Vertical Drive

VBS – Composite Video Signal

Master – The device that provides the sync signal to other devices.

Slave – The device that uses a sync signal from other devices.

Pixel Clock – A sync method which divides an incoming line of data into pixel data for more exact

synchronization.

Trigger – A special signal provided to a camera to start some needed operation. Commonly used in machine vision for

image acquisition.

Video Signals – Color video signals are made of light (luminance) and color (chroma). Two very common video signals are

Composite and Y/C (S-Video). These signals carry essentially the same data, but with different “formats.” Composite mixes

the light and color into a single signal. Y/C separates the light and chroma into separate signals.

White Balance – A function allowing the value of white to be established. With “Auto” white balance settings, slight color

shifts will occur with changing light conditions as the camera re-calculates the value of white. With “Manual” white balance

settings the values of the Red Gain and Blue Gain are manually set and do not vary. Auto white balance is used when the

color of light can change. Manual white balance is used when the light source values are constant.

Units of Measurement

Vp-p –Volts peak to peak. The voltage difference that exists between the most positive and most negative peaks of an

electric signal. A correct, standard video signal measures one volt peak to peak.

Lux – A measurement of light. The smaller the Lux value the more light “sensitive” the camera performs.

dB Decibel – Logarithmic measure of relative power levels. For example, concerning video noise the ratio is between the

video signal and the noise. S/N = 56dB. For S/N the higher the number the better.

All Specifications are subject to change without notification.

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