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參數資料
| 型號： | OV7620 |
| 廠商： | Electronic Theatre Controls, Inc. |
| 英文描述： | OV7620 SINGLE-CHIP CMOS VGA COLOR DIGITAL CAMERA |
| 中文描述： | OV7620的單芯片CMOS VGA彩色數碼相機 |
| 文件頁數： | 40/60頁 |
| 文件大小： | 313K |
| 代理商： | OV7620 |
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OV7620 Product Specifications - Rev. 1.2 (5/13/00)
OMNIVISION TECHNOLOGIES INC.
40
Preliminary
Company Confidential
Register 25
-
rw: AEC Auto Exposure Black Pixel Ratio
AEB7-AEB0 - used to calculate the black pixel ratio. OV7620 AEC algorithm is count whole field/frame
white pixel (its luminance level is higher than a fixed level) and black pixel (its luminance level
is lower than a fixed level) number. When white/black pixel ratio is same as the ratio defined
by registers [25] and [26], image stable. This register is used to define black pixel ratio, default
is 75%, each LSB represent step: Interlaced: 1.3%; Progressive Scan: 0.7%. Change range is:
Interlaced: [01] ~ [4A]; Progressive Scan: [01] ~ [96]. Increase AEB<7:0> will increase black
pixel ratio. For same light condition, the image brightness will decrease if AEB<7:0> increase.
Note: AEB<7:0> must combined with register [25] AEW<7:0>. Keep the relation always true: AEW<7:0> +
AEB<7:0> > [4D] for Interlaced; AEW<7:0> + AEB<7:0> > [90].
Register 26
-
rw: Common control F
COMF7 - COMF6: Digital Sharpness threshold selection.
[00] - Difference of neighbor pixel luminance is larger than 8 mV, correction on.
[01] - 16 mV.
[10] - 32 mV.
[11] - 64 mV.
COMF5 - COMF4: Digital Sharpness Magnitude selection.
[01] - Strength is 50% of difference of neighbor pixel luminance.
[10] - 100%.
[11] - 200%.
COMF3 - Reserved
COMF2 - Swap bus MSB/LSB. “1” LSB->Bit7, MSB->Bit0; “0” normal.
COMF1 - “1” A/D Black level calibration enable. Do not use “0”.
COMF0 - “1” Output first 4 line black level for Interlaced Mode and 8 line black level for Progressive Scan
Mode before valid data output. HREF number will increase 4/8 relatively. “0” no black level
output.
Bits
AEB7
AEB6
AEB5
AEB4
AEB3
AEB2
AEB1
AEB0
Interlace
0
1
0
0
1
0
1
0
Progressive Scan
1
0
0
0
1
0
1
0
Bits
COMF7
COMF6
COMF5
COMF4
COMF3
COMF2
COMF1
COMF0
Default
1
0
1
0
0
0
1
0
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