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參數(shù)資料
型號(hào): W99681CF
廠商: WINBOND ELECTRONICS CORP
英文描述: JPEG USB Dual Mode Camera Chip(運(yùn)用JPEG壓縮技術(shù)、通用串行總線結(jié)構(gòu)技術(shù)、雙制式的照相電路數(shù)字處理芯片的攝像照相機(jī)接口控制器)
中文描述: JPEG格式相機(jī)的USB雙模芯片(運(yùn)用的JPEG壓縮技術(shù),通用串行總線結(jié)構(gòu)技術(shù),雙制式的照相電路數(shù)字處理芯片的攝像照相機(jī)接口控制器)
文件頁數(shù): 21/78頁
文件大小: 816K
代理商: W99681CF
W99681CF
Publication Release Date: March 2000
- 21 - Revision A1
VICLK
16-bit UV Mode (CR26_10-8=00x)
Y0
Y1
Y2
Y3
Y4
Y5
Y6
U0
V0
U2
V2
U4
V4
U6
Y[7:0]
UV[7:0]
16-bit VU Mode (CR26_10-8=01x)
Y0
Y1
Y2
Y3
Y4
Y5
Y6
V0
U0
V2
U2
V4
U4
V6
Y[7:0]
UV[7:0]
8-bit YUYV Mode (CR26_10-8=100)
Y0
U0
Y1
V0
Y2
U2
Y3
Y[7:0]
8-bit UYVY Mode (CR26_10-8=101)
U0
Y0
V0
Y1
U2
Y2
V2
Y[7:0]
8-bit YVYU Mode (CR26_10-8=110)
Y0
V0
Y1
U0
Y2
V2
Y3
Y[7:0]
8-bit VYUY Mode (CR26_10-8=111)
V0
Y0
U0
Y1
V2
Y2
U2
Y[7:0]
Figure 7.1 Input Video Data Formats
7.1.3 Cropping
A cropping rectangle (or window) is supported for cropping or clipping the incoming video data. Only
interested video data located inside the cropping rectangle is processed and sent to the host system.
The cropping rectangle can be moved within the input rectangle by programming the Cropping Window
Start X and Cropping Window Start Y registers. Cropping is performed based on the VS signal for
vertical cropping and HS signal for horizontal cropping. Both VS and HS are programmable polarity for
maximum flexibility.
7.1.4 Scaling
The cropped video can be down-scaled horizontally and/or vertically. The horizontal down-scaling and
vertical down-scaling are performed independently by using two DDAs (Digital Differential Accumulator)
with
Horizontal Down-scaling Factor
Captured Video Width
Cropping Window End X
Cropping Window Start X
and
Vertical Down-scaling Factor
Captured Video Height
Cropping Window End Y
Cropping Window Start Y
.
=
=
The W99681CF does not perform up-scaling during video pre-processing. To produce CIF format from
240-line video for the JPEG compression, a special vertical up-scaling can be performed by the JPEG
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