參數(shù)資料
型號: HD49801FB
廠商: Electronic Theatre Controls, Inc.
元件分類: 數(shù)字信號處理
英文描述: Digital Signal Processing IC for CCD Cameras
中文描述: 數(shù)字信號處理集成電路CCD相機(jī)
文件頁數(shù): 16/43頁
文件大小: 185K
代理商: HD49801FB
State Data A6:
Color difference gain, base clip
This data determines the signal levels of the color difference signals.
Color difference gain control characteristics
G
R-Y
, G
B-Y
= D7
×
2
0
+ D6
×
2
–1
+ D5
×
2
–2
+ D4
×
2
–3
+ D3
×
2
–4
+ D2
×
2
–5
+ D1
×
2
–6
(0 to 2)
Base clip level control characteristics
C
LC
max = 7/256 = 0.0273437
C
LC
= D3
×
2
–6
+ D2
×
2
–7
+ D1
×
2
–8
Setting the gains
(a) The ratio of the gains R-Y and B-Y is determined by the color reproduction.
(b) Increase the color difference gain from the gain ratio from item (a) above.
(c) Set the gain to have a 10% to 20% margin from the gain at the point the output signal clips in item
(b) above.
I.e., (set gain) = (clipping gain)
×
0.8 to 0.9
R-Y
8
–CL
C
+CL
C
G
R-Y
×
8
(R-Y)'
128
256
to +127
256
B-Y
8
–CL
C
+CL
C
G
B-Y
×
8
(B-Y)'
128
256
to +127
256
Out
In
CL
C
0 to
7
256
Base clip
16
HD49801FB
HD49801FB
D1 D7 D6 D5 D4 D3 D2 D1 D7 D6 D5 D4 D3 D2 D1
0
1
0
1
C clip CL
R-Y gain G
Address
D3 D2
C
R-Y gain G
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