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RGBlink vue PTZ camera User Manual
49
video controllers.
DMX512 is delivered over cable of 2 twisted pairs with 5pin XLR cables for connection.
●ArtNet: An ethernet protocol based on TCP/IP protocol stack, mainly used in entertainment/events applications. Built
on the DMX512 data format, ArtNet enables multiple “universes” of DMX512 to be transmitted using ethernet networks
for transport.
●
MIDI:
MIDI is the abbreviation of Musical Instrument Digital Interface. As the name indicates the protocol was
developed for
communication between electronical musical
instruments and latterly computers. MIDI instructions are
triggers or commands sent over twisted pair cables, typically using 5pin DIN connectors.
●OSC:
The principle of Open Sound Control
(OSC) protocol is for networking sound
synthesizers, computers, and
multimedia
devices for musical performance or show control. As with XML and JSON, the OSC protocol allows sharing
data. OSC is transported via UDP packets between devices connected on an Ethernet.
●Brightness
：
Usually refers to the amount or intensity
of video light produced on a screen without regard to colour.
Sometimes called black level.
●
Contrast
Ratio
：
The ratio of the high light output level divided by the low light output level. In theory, the
contrast ratio of the television system should be at least 100:1, if not 300:1. In reality, there are several limitations.
Well-controlled viewing conditions should yield a practical contrast ratio of 30:1 to 50:1.
●
Colour
Temperature: The colour quality, expressed in degrees Kelvin (K), of a light source. The higher the
colour
temperature, the bluer the light. The lower the temperature, the redder the light. Benchmark colour temperature
for the A/V industryinclude5000°K,6500°K,and 9000°K.
●
Saturation:
Chroma, Chroma gain. The intensity of the colour, or the extent to which a given colour in any image is free
from white. The less white in a colour, the truer the colour or the greater its saturation. Saturation is the amount of
pigment in a colour, and not the intensity.
●
Gamma:
The light output of a CRT is not linear with respect to the voltage input. The difference between what
you should have and what is actually output is known as gamma.
●Frame: In interlaced video, a frame is one complete image.A video frame is made up of two fields, or two sets of
interlaced lines. In a film, a frame is one still image of a series that makes up a motion image.
●
Genlock:
Allows synchronisation of otherwise video devices. A signal generator provides a signal pulses which
connected devices can reference. Also see Black Burst and Color Burst.
●Blackburst:
The video waveform without the video elements.It includes the vertical sync, horizontal sync, and
the Chroma burst information. Blackburst is used to synchronize video equipment to align the video output.
●ColourBurst: In colour TV systems, a burst of subcarrier frequency located on the back part of the composite video
signal. This serves as a colour synchronizing signal to establish a frequency and phase reference for the Chroma signal.
Colour burst is 3.58 MHz for NTSC and 4.43 MHz for PAL.
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