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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R5976694 IQ PRO R500 01/02/2007
Summary of Contents for iQ Pro R500
Page 1: ...iQ Pro R500 Owner Manual R9010221 R5976694 04 01 02 2007 ...
Page 6: ......
Page 10: ...Table of contents 4 R5976694 IQ PRO R500 01 02 2007 ...
Page 17: ...2 Installation Guidelines 1 2 3 4 Image 2 1 R5976694 IQ PRO R500 01 02 2007 11 ...
Page 24: ...2 Installation Guidelines 18 R5976694 IQ PRO R500 01 02 2007 ...
Page 34: ...3 Connections 28 R5976694 IQ PRO R500 01 02 2007 ...
Page 48: ...4 Getting started 42 R5976694 IQ PRO R500 01 02 2007 ...
Page 54: ...5 Source Selection Image 5 9 48 R5976694 IQ PRO R500 01 02 2007 ...
Page 60: ...6 General Menu Image 6 10 54 R5976694 IQ PRO R500 01 02 2007 ...
Page 80: ...7 Image Menu Image 7 38 74 R5976694 IQ PRO R500 01 02 2007 ...
Page 100: ...10 Lamp Menu 94 R5976694 IQ PRO R500 01 02 2007 ...
Page 110: ...11 Image files menu Image 11 20 104 R5976694 IQ PRO R500 01 02 2007 ...
Page 120: ...12 Display setup 114 R5976694 IQ PRO R500 01 02 2007 ...
Page 188: ...19 Troubleshooting 182 R5976694 IQ PRO R500 01 02 2007 ...
