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參數(shù)資料
| 型號(hào)： | LR38603 |
| 廠商： | Sharp Corporation |
| 元件分類： | 數(shù)字信號(hào)處理 |
| 英文描述： | Digital Signal Processor for Color CCD Cameras |
| 中文描述： | 數(shù)字信號(hào)處理器的彩色CCD相機(jī) |
| 文件頁(yè)數(shù)： | 20/26頁(yè) |
| 文件大小： | 160K |
| 代理商： | LR38603 |
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LR38603
20
AUTOMATIC CAMERA FUNCTION
CONTROL
Automatic Electronic Exposure Control
Electronic shutter speed is controlled so that the
exposure control data approach the data of
REF_IRIS1 (address 06h).
Under BLC mode, the data of REF_IRIS2 (address
09h) are available instead of REF_IRIS1.
If the exposure control data are less than the data
of CTLD_AGC (address 07h), an electronic shutter
speed is held. And then PGA gain is controlled so
that the exposure control data will be less than the
data of CTLD_0 (Address 08h).
If the exposure control data are greater than the
data of CTLD_AGC (address 07h), exposure
control starts again.
Electronic Shutter Speed Setting
Electronic shutter speeds below can be selected by
either hardware or coefficient data.
EEMDS
EEMD
1
EEMD
2
EEMD
3
ELECTRONIC SHUTTER SPEED
NTSC
PAL
0
0
0
0
0
0
0
0
1
1
1
1
1
1
0
0
0
0
1
1
1
1
0
0
0
0
1
1
0
0
1
1
0
0
1
1
0
0
1
1
0
0
0
1
0
1
0
1
0
1
0
1
0
1
0
1
1/60 s
1/100 s
1/250 s
1/500 s
1/1 000 s
1/2 000 s
1/5 000 s
1/10 000 s
1/20 000 s
1/50 000 s
1/100 000 s
1/30 s
1/15 s
1/7.5 s
AUTO
1/60 s to MAX_SH (address 05h)
AUTO
1/60 s to 1/100 000 s
1/50 s
1/120 s
1/250 s
1/500 s
1/1 000 s
1/2 000 s
1/5 000 s
1/10 000 s
1/20 000 s
1/50 000 s
1/100 000 s
1/25 s
1/12.5 s
1/6.25 s
AUTO
1/50 s to MAX_SH (address 05h)
AUTO
1/50 s to 1/100 000 s
1
1
1
0
1
1
1
1
A slower shutter speed of less than 1/60 s (1/50 s
of PAL) can make images whose interval is every
two fields, every four fields, etc.
VD pulse is also converted to the same frequency
as the output image rate.
Electronic exposure control data come from the
following equation using averaged luminance levels
of 64 areas in one image, made by DSP.
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