STV-DCA-VGA-E01 Просмотр технического описания (PDF) - Vision
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STV-DCA-VGA-E01 Datasheet PDF : 61 Pages
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PRELIMINARY
Digital Camera Chipset; Customer Datasheet, Rev 3.0, March 2000
STV0680A + VV6444/6410/6500
2. Detailed features
2.1 Sensor type and image formats
The sensor type is auto-detected by STV0680A, which ensures that the correct sensor timing is enabled, and the correct image
resolutions are enabled, as shown in Table 4.
For stills photography, ‘High’ or ‘Low’ resolution mode can be selected, to give CIF or QCIF pictures from a CIF sensor, and VGA
or QVGA from a VGA sensor (see Table 4 and Section 3.7). Reduced resolution allows for storage of more images. Images
captured in both ‘High’ and ‘Low’ resolution can be stored in camera memory at the same time. Therefore there is no need for
images stored in memory to be cleared before changing image resolution.
Where USB is connected, the host PC software (through a Video for Windows driver) can activate tethered video mode,
regardless of the user inputs to the camera buttons. In this case, the image resolution is controlled by the PC driver..
Sensor
Sensor
Image Size
Resolution
mode
Final Image Size
Max. no. of
images
stored in
16MBit
memory
Max. no. of
images
stored in
64MBit
memory
Approximate
VfW framerate
(*)
VV6444/
6410
CIF 352 x 288
VV6500 VGA 640 x 480
High
CIF 352 x 288
20
80
Low
QCIF 176 x 144
(Subsampled)
80
320
(see notes)
High
VGA 640 x 480
(6)
26
Low
QVGA 320 x 240
(24)
106
(Subsampled)
Table 4 : Image modes supported (STV0680A-002)
9 frames/sec
25 frames/sec
2 frames/sec
12 frames/sec
*Notes:
1. VfW framerate is dependant on PC performance and USB bus loading
2. Not all image sizes are supported by all STV0680/680A variants - see Table 2 for clarification.
3. A CIF camera with STV0680A-002 and 64Mbit SDRAM can store up to 320 images by using QCIF mode. Where >99 images
are still available, the LCD display will remain at 99. Where (no. of images available) <99, the LCD display will show the
number of images available, as is the case with all other modes.
Sensor
Sensor
Image
Size
Resolution
mode
Final Image Size
Max. no. of
images
stored in
16MBit
memory
VV6444 CIF 352 x
High
CIF 352 x 288
20
288
Low
QCIF 176 x 144
80
(Subsampled)
Table 5 : Image modes supported (STV0680-001)
2.1.1 VV6444
VV6444 is a CIF resolution, 5V CMOS imaging sensor. A brief specification is shown in Section 7. VV6444 has the same
functionality and array size as the un-microlensed VV6404 sensor, but has a microlensed array and different colour
characteristics. Although the VV64444 and VV6404 are electrically identical, the STV0680 and STV0680A use the correct
CDSTV0680F-C
10
STV0680F_contents.fm
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