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參數(shù)資料
| 型號： | SDA9280 |
| 廠商： | SIEMENS A G |
| 元件分類： | 消費家電 |
| 英文描述： | ICs for Consumer Electronics |
| 中文描述： | SPECIALTY CONSUMER CIRCUIT, PQCC68 |
| 文件頁數(shù)： | 14/43頁 |
| 文件大?。?/td> | 249K |
| 代理商： | SDA9280 |
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SDA 9280 B22
Semiconductor Group
14
1998-02-01
Figure 4
Luminance Peaking
2.4
A new digital algorithm is implemented to improve horizontal transitions of the
chrominance signals resulting in a better picture sharpness. A slow change from one
color to another by reason of small chrominance bandwidth is replaced by a steep
transition.
The exact position of a color transition (POS) is calculated by detecting the
corresponding zero transition of the second derivative of both chrominance signals. Low
pass filtering (LPU, LPV, LPUV) is performed to avoid noise sensitivity. The width of a
transition is derived from a threshold detector signal. It indicates an area around the
detected position where the first derivatives of the chrominance signals exceed a
programmable threshold (
Ι
2
C signal: THRESH). The parameter THRESH modifies the
sensitivity of the DCTI-circuit. High values cause that only significant color transitions are
improved. Small color variations remain unchanged. The detected transition width can
be limited by the programmable parameter TRAWID. This parameter performs an
adaption to the input chrominance band width. For signals with small chrominance
bandwidth (e.g. video recorders) the DCTI-performance is optimized using high values
for TRAWID. Input signals with high chrominance bandwidth should be processed with
small values for TRAWID. If standard 4:1:1 video signals are processed, it is
recommended to choose values of the mid range for both parameters THRESH and
TRAWID.
Digital Color Transient Improvement (DCTI)
UES10247
HP(z)
BP(z)
LP(z)
HCOF
BCOF
LCOF
Coring
COR
YOUT
YIN
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相關代理商/技術參數(shù) |
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|---|---|
| SDA9280B22 | 制造商:INFINEON 制造商全稱:Infineon Technologies AG 功能描述:ICs for Consumer Electronics |
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| SDA9290-5 | 制造商:INFINEON 制造商全稱:Infineon Technologies AG 功能描述:Picture Processor |
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