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8. Image Menu
Black leve
∆
G
∆Β
∆
R
R
G
B
Image 8-21
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 : superfleous information
i2 : video information
Image 8-22
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).
8.7.2
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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R5976697 CINEVERSUM™ 110 06012004
Summary of Contents for CineVERSUM 110 R9010120
Page 1: ...HOME CINEMA CINEVERSUM 110 R9010120 OWNER S MANUAL 06012004 R5976697 00...
Page 4: ......
Page 8: ...Table of contents 4 R5976697 CINEVERSUM 110 06012004...
Page 32: ...3 Connections 28 R5976697 CINEVERSUM 110 06012004...
Page 44: ...4 Getting Started 40 R5976697 CINEVERSUM 110 06012004...
Page 52: ...6 Source Selection 48 R5976697 CINEVERSUM 110 06012004...
Page 86: ...9 Tools Menu 82 R5976697 CINEVERSUM 110 06012004...
Page 116: ...13 Display Setup Image 13 34 112 R5976697 CINEVERSUM 110 06012004...
Page 128: ...A Standard Image Files 124 R5976697 CINEVERSUM 110 06012004...