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8. Image Menu
In case of information contained in the amplitude of the signals which is the case of data color signals (R, G, B),image 8-33 , we are
quite sure that the amplitude of these color signals is subject to alterations.
An example of alteration may be a DC component added to the signal, in the form of a DC offset repositioning the black level, since
this
black level
(
“brightness”
) will become crucial later on (clamping circuit) it will result in “black not being black”.
Another value that is subject to alteration is the amplitude of the signal, resulting in an altered “Gain” of the signal (
“white level”
or
contrast
).
The alterations of the three color signals will happen independently i.e. the colors will end to be unbalanced, image 8-34
B
Black level
0.7V
Image 8-33
Black level
∆
G
∆Β
∆
R
R
G
B
Image 8-34
One can conclude here that a good color tracking can only be met by using three previously (input) balanced
color signals
Analog Digital Conversion
The analog color signals must pass through an Analog/Digital conversion circuit prior to any digital processing in the PMP.
A typical ADC transforms the analog value into an 8 bit coded digital signal.
The graphic shows that when converting a signal containing a DC offset component the range of the converter is not optimally used.
Black level
∆
R
ADC
0
255
i1 : superfluous information
i2 : video information
Image 8-35
One can conclude here that a good data conversion can only be met by using three previously (input) balanced
color signals
The objective of input balancing
The objective in input balancing is to “set” the same black level and the same white level for the three colors of a particular input
source.
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R5976629 BARCORLM G5 02/06/2006
Summary of Contents for BarcoRLM G5
Page 1: ...BarcoRLM G5 Owner s manual R9010020 R9010021 R5976629 05 02 06 2006 ...
Page 4: ......
Page 8: ...Table of contents 4 R5976629 BARCORLM G5 02 06 2006 ...
Page 14: ...1 Packaging and Dimensions 10 R5976629 BARCORLM G5 02 06 2006 ...
Page 36: ...3 Connections 32 R5976629 BARCORLM G5 02 06 2006 ...
Page 50: ...4 Getting Started 46 R5976629 BARCORLM G5 02 06 2006 ...
Page 54: ...5 Getting used with the Menu structure 50 R5976629 BARCORLM G5 02 06 2006 ...
Page 60: ...6 Source Selection 56 R5976629 BARCORLM G5 02 06 2006 ...
Page 64: ...7 General Menu Image 7 7 60 R5976629 BARCORLM G5 02 06 2006 ...
Page 90: ...8 Image Menu Image 8 46 Image 8 47 86 R5976629 BARCORLM G5 02 06 2006 ...
Page 100: ...9 Tools Menu 96 R5976629 BARCORLM G5 02 06 2006 ...
Page 139: ...14 Installation menu Image 14 21 R5976629 BARCORLM G5 02 06 2006 135 ...
Page 140: ...14 Installation menu 136 R5976629 BARCORLM G5 02 06 2006 ...
Page 154: ...A Standard Image Files 150 R5976629 BARCORLM G5 02 06 2006 ...