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T108 Release
Copyright by Terawins, Inc.
14
2.3
Black-Level Extension (BLE)
Black Level Expansion (BLE) can enhance image contrast that makes dark regions of image darker,
while bright regions remain unchanged. The figure shown below is BLE transfer function.
Y out
Y in
BLE_threshold
Without BLE
With BLE
Figure 2-6 Black Level Expansion
16
/
_
*
)
(
Gain
BLE
Yin
Yoffset
Yin
Yout
−
−
=
Where
Yoffset and
Gain
BLE _
can be programmed by register P0_96h.
2.4 Color Space Converter
A pixel in YCbCr color space can be converted to RGB color space by using following equations,
)
128
(
*
_
/
)
128
(
*
_
)
16
(
*
_
)
128
(
*
_
)
128
(
*
_
)
16
(
*
_
)
128
(
*
_
)
128
(
*
_
/
)
16
(
*
_
−
−
+
−
+
−
=
−
−
−
−
−
=
−
+
−
−
+
−
=
Cr
B
CrCoef
Cb
B
CbCoef
Y
B
YCoef
B
Cr
G
CrCoef
Cb
G
CbCoef
Y
G
YCoef
G
Cr
R
CrCoef
Cb
R
CbCoef
Y
R
YCoef
R
The equations shown as below correspond to a typical YCbCR-to-RGB converter.
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