STV3550 datasheet(33/144 Pages) STMICROELECTRONICS

部件名	STV3550

功能描述	LCD and Matrix Display TV Processor

PDF	144 Pages

Scroll/Zoom	100%

制造商	STMICROELECTRONICS [STMicroelectronics]

网页	http://www.st.com

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STV3550

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3.3.6.3 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.

The gain parameter magnifies the correction factor and modifies the global curves in relation to the

standard linear curve.

Figure 22 shows the grey stretch algorithm with various range values.

Table 10: Range and Slope Values

Range

Slope

00.25

10.50

20.75

31.00

Figure 22: Grey Stretch

STV3550 数据表(PDF) 33 Page - STMicroelectronics