S5D4100X Datasheet, PDF (20/94 Pages) Samsung semiconductor – Digital Interface Including Scaler, Image Enhancement

DATASHEET
S5D4100X
5.3 BOOST-UP
The BOOST-UP block performs image enhancement so that the image can be seen more clearly. Main functions
of image boost-up are as follows.
5.3.1 Adaptive Contrast Control
This function makes a certain area or the entire area of the screen clearer. This is achieved as the block sorts out
the colors being displayed on the screen, finds the maximum and the minimum value, and displays the image with
the colors calculated adaptively through the contrast control processing.
5.3.2 Adaptive Brightness Control
This function makes the screen brighter in accordance with the LUT value. As shown in Figure 9, LUT is a value
between 0 ~ 255, and maps input/output in 1:1 ratio. The size of the curve A configured in accordance with
input/output mapping varies adaptively in accordance with the brightness of the screen. Point B is the inflection
point of the curve which should be set by the turning point Register (TURN_POINT). All the values of LUT should
be set to the size of the absolute value. The values in the area lower than Register TURN_POINT (Area C) are
automatically calculated as the negative values.
5.3.3 Boost Up Calculation Area
The Boost-Up block reflects the previous screen status in the current screen. The area in which the screen status
is judged becomes the calculation area. The screen is divided into the calculation area and the reflected area in
order to prevent the screen from being affected by other data such as caption dialog than the actual video image.
O
255
A
C
B
0
255 ^I
Figure 9. Adaptive Brightness Control LUT
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