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7. Image Menu
Black level
∆
G
∆Β
∆
R
R
G
B
Image 7-25
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 7-26
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.
Black level setting : brightness
White level setting : contrast
The same absolute black and white level for the three colors allows the same reference for Brightness and contrast control of the
picture !
These two references also set the range in which the ADC will work for that particular source ( this explains also why each input
balance setting is linked to a particular source and thus saved in the image file).
How can it be done ?
To balance the three color signals of a particular source there are conditions; in fact we must know the black and the white level of
the source i.e. :
1.
the source in question must be able to generate a white signal, ideally a 100% white (background) full screen pattern
2.
the source in question must be able to generate a black signal, ideally a 100 % black (background) full screen pattern
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R5976693 BARCOIQ REALITY 500 01/02/2007
Summary of Contents for iQ Reality 500
Page 1: ...BarcoiQ Reality 500 Owner s Manual R9010160 R5976693 02 01 02 2007 ...
Page 4: ......
Page 8: ...Table of contents 4 R5976693 BARCOIQ REALITY 500 01 02 2007 ...
Page 15: ...2 Installation Guidelines 1 2 3 4 Image 2 1 R5976693 BARCOIQ REALITY 500 01 02 2007 11 ...
Page 22: ...2 Installation Guidelines 18 R5976693 BARCOIQ REALITY 500 01 02 2007 ...
Page 34: ...3 Connections 30 R5976693 BARCOIQ REALITY 500 01 02 2007 ...
Page 48: ...4 Getting started 44 R5976693 BARCOIQ REALITY 500 01 02 2007 ...
Page 54: ...5 Source Selection Image 5 9 50 R5976693 BARCOIQ REALITY 500 01 02 2007 ...
Page 60: ...6 General Menu Image 6 10 56 R5976693 BARCOIQ REALITY 500 01 02 2007 ...
Page 80: ...7 Image Menu Image 7 38 76 R5976693 BARCOIQ REALITY 500 01 02 2007 ...
Page 90: ...8 Tools Menu 86 R5976693 BARCOIQ REALITY 500 01 02 2007 ...
Page 100: ...10 Lamp Menu 96 R5976693 BARCOIQ REALITY 500 01 02 2007 ...
Page 110: ...11 Image files menu Image 11 20 106 R5976693 BARCOIQ REALITY 500 01 02 2007 ...
Page 136: ...15 Standard Image Files 132 R5976693 BARCOIQ REALITY 500 01 02 2007 ...
Page 140: ...Index 136 R5976693 BARCOIQ REALITY 500 01 02 2007 ...