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9. Image menu
Black level
∆
G
∆Β
∆
R
R
G
B
Image 9-43
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 9-44
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 allow 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).
9.3.9.2
Adjusting the input balance
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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Содержание FLM HD18
Страница 1: ...FLM HD18 Users manual R9004450 R5976986 00 01 09 2006...
Страница 4: ......
Страница 44: ...5 Connections 40 R5976986 FLM HD18 01 09 2006...
Страница 56: ...6 Getting started 52 R5976986 FLM HD18 01 09 2006...
Страница 90: ...9 Image menu 86 R5976986 FLM HD18 01 09 2006...
Страница 104: ...10 Layout menu Image 10 53 Image 10 54 Image 10 55 Image 10 56 100 R5976986 FLM HD18 01 09 2006...
Страница 134: ...13 Projector control 130 R5976986 FLM HD18 01 09 2006...
Страница 166: ...17 Removal of the projector covers 162 R5976986 FLM HD18 01 09 2006...
Страница 170: ...A Dimensions 166 R5976986 FLM HD18 01 09 2006...
Страница 186: ...E Order info 182 R5976986 FLM HD18 01 09 2006...