STV0974E/TR STMicroelectronics, STV0974E/TR Datasheet - Page 50

• Manufacturer Part Number: STV0974E/TR
• Description: IC DSP IMAGING VGA CMOS 6X6TFBGA
• Manufacturer: STMicroelectronics

Specifications of STV0974E/TR

• Applications: *
• Mounting Type: Surface Mount
• Package / Case: 56-TFBGA
• Operating Temperature (max): 70C
• Operating Temperature Classification: Commercial
• Mounting: Surface Mount
• For Use With: 497-3891 - KIT DEMO W/VS6552
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Other names: 497-3887-2; STV0974E/TR

STV0974
Note:
Table 34: Scaler low-level control
If the scaling factor it too high and the cropped image size is bigger than the full source image, the
scaling factor is automatically set to the closest possible high value.
MMS Downscale zoom
This section contains an example of how the low level scalar registers can be used to implement a
down scale ‘zoom’ feature suitable for MMS applications. The example assumes that the desired
output image size is 160 x 120 pixels. The choice of output image size will limit the number of
scaling options available. In this example we are able to select scaling factors 1, 1.5, 2, 2.5, 3 and 4.
The source image from which the scaled output images are derived is always the full VGA array,
640 x 480 pixels.
If a smaller output image is chosen, 96 x 80 for example, then clearly the entire scaling factor range
would be available.
With reference to the example below (
This implies that the full scene field of view is preserved within the output image but heavily scaled.
To ensure that the smaller scaling factors produce the same output image size it is necessary for
the video processor to crop the source VGA image prior to scaling. This has the effect of limiting the
scene field of view but yields the ‘zoom’ effect.
Still / Live Scaling
factor
Name
0x806D
Index
R/W
R/W
Figure 29
State
code
A
Data
type
), a scaling factor of 4 actually yields a ‘zoom’ of 1.
I
RRRR.RDDD
0000.0001
Format
default
Scaling factor in Still/Live:
0: Reserved
1: x1 (Default)
2: x2
3: x3
4: x4
5: x5
6: x6
7: x1.5
8: x2.5
Functional description
Description
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