STV3550B STMicroelectronics, STV3550B Datasheet - Page 34

• Manufacturer Part Number: STV3550B
• Manufacturer: STMicroelectronics

Specifications of STV3550B

• Operating Temperature (min): 0C
• Operating Temperature (max): 70C
• Operating Temperature Classification: Commercial
• Mounting: Surface Mount
• Lead Free Status / Rohs Status: Compliant

Video function description
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Grey stretch
In grey stretch mode, the black and white stretch values are combined to increase the
contrast in both the black and white parts of the image. This function decreases the black
level in the dark part of the image and increases the white level in the bright part. It can be
used to increase the global contrast on low-contrast sequences that are centered on the
average brightness. By default, the inflection point is based on the value of the average
brightness, but another value can be set by the user. In this case, the range parameter is
used to modify the slope of the central segment.
Table 10.
The gain parameter magnifies the correction factor and modifies the global curves in relation
to the standard linear curve.
Figure 22
Figure 22. Grey stretch
Figure 23
shows the grey stretch algorithm with various range values.
shows the grey stretch algorithm with the maximum gain value.
Range and slope values
Range
0
1
2
3
Slope
0.25
0.50
0.75
1.00
STV3550