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參數(shù)資料
| 型號： | STV9212 |
| 廠商： | 意法半導(dǎo)體 |
| 英文描述： | Video Processor for CRT Monitors with PictureBooST |
| 中文描述： | 視頻處理器PictureBooST的CRT顯示器 |
| 文件頁數(shù)： | 10/34頁 |
| 文件大?。?/td> | 335K |
| 代理商： | STV9212 |
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Functional Description
STV9212
10/34
2.4
PictureBooST
The PictureBooST
function provides a picture enhancement effect for images with photographic
or moving video contents.
The function is activated whenever the level on pin PB is high (TTL) or the bit PBINSis at 1, if the
general PictureBooST
enable bit PBGEN is at 1. By means of PB input signal toggling, the
function can take effect in a part of the screen, e.g. a window, or on the whole screen.
The picture enhancement is achieved through combination of three actions, as shown in
Figure 9
:
G
a content-sensitive peaking with slow restore (vivacity),
G
a contrast addition,
G
a brightness addition.
The vivacity amplitude depends on the slope height and steepness and on the status of bits
PBVIVAM[1:0] The return to stabilized state is exponential with a time constant adjustable via bits
PBVIVTC[2:0] Any undershoot below the video black level is clipped to a level close to black.
The PictureBooST
brightness is a DC offset superimposed on the video signal in the boosted
zone. Its value is selected by bits PBBRIG[1:0] The vivacity and PictureBooST
brightness are
both enabled by bit PBVIVEN.
The PictureBooST
contrast component evenly increases the video amplitude in the boosted zone.
Its value is controlled by bits PBCRST[1:0]
Refer to
Section 4: Electrical Specifications
for values.
Figure 9: PictureBooST Action
PB brightness
H-sync
Video before
PictureBooST
stage
PB input
τ
viv
V
viv
PB
contrast
Video after
PictureBooST
stage
clipping
A
A
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