© Xiamen RGBlink Science & Technology Co., Ltd.
Ph: +86 592 5771197
| support@rgblink.com | www.rgblink.com
●
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,and9000°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.
●Colour Bars:
A standard test pattern of several basic
colours (white, yellow, cyan, green, magenta, red, blue, and black)
as a reference for system alignment and testing. In NTSC video, the most commonly used colour bars are the SMPTE
standard colour bars. In PAL video, the most commonly used colour bars are eight full field bars. On computer
monitors the most commonly used colour bars are two rows of reversed colour bars
●Seamless Switching: A feature found on many video switchers. This feature causes the switcher to wait until the
vertical interval to switch. This avoids a glitch (temporary scrambling) which often is seen when switching between
sources.
●Scaling: A conversion of a video or computer graphic signal from a starting resolution to a new resolution. Scaling from
one resolution to another is typically done to optimize the signal for input to an image processor, transmission path or
to improve its quality when presented on a particular display.
●
PIP:
Picture-In-Picture. A small image within a larger image created by scaling down one of image to make it smaller.
Other forms of PIP displays include Picture-By-Picture (PBP) and Picture- With-Picture (PWP), which are commonly used
with 16:9 aspect display devices. PBP and PWP image formats require a separate scaler for each video window.
To Next Page
Loading...
Need help?
General
