18-27
MB86R02 ‘Jade-D’ Hardware Manual V1.64
18.6.6 Programmable YCbCr/RGB conversion for L1-layer display
L1-layer can display video data in YCbCr format but RGB conversion coefficients are hard-wired and
fixed about previous products. MB86R02 'Jade-D' can program RGB conversion coefficients by
registers.
YCbCr data is converted by following expression.
R = a
11
×
Y + a
12
×
(Cb
−
128) + a
13
×
(Cr
−
128) + b
1
G = a
21
×
Y + a
22
×
(Cb
−
128) + a
23
×
(Cr
−
128) + b
2
B = a
31
×
Y + a
32
×
(Cb
−
128) + a
33
×
(Cr
−
128) + b
3
a
ij
---- 11bit signed real (lower 8bit is fraction, two's complement)
b
i
----- 9bit signed integer (two's complement)
It is represended by matrix operation.
These parameters are set on registers shown bellow.
L1YCR0 (a
12
,a
11
), L1YCR1(b
1,
a
13
)
L1YCG0 (a
22,
a
21
), L1YCG1(b
2,
a
23
)
L1YCB0 (a
32,
a
31
), L1YCB1(b
3,
a
33
)
Same conversion with previous products is applied by initial values of these registers after reset.
The register values just after reset is as follow.
a
11
= 0x12b (299/256) , a
12
= 0x0, a
13
= 0x198 (408/256)
a
21
= 0x12b (299/256), a
22
= 0x79c (-100/256), a
23
= 0x72f (-209/256)
a
31
= 0x12b (299/256), a
32
= 0x204 (516/256), a
33
= 0x0
b
1
= b
2
= b
3
= 0x1f0 (-16)
It is possible to control brightness, contrast, hue , color saturation by change these parameters.
Addition of a constant value into
b
means inclease of brightness.
Multiplication of a constant scalar value greater than one into
A
means increase of contrast.
Two dimentional rotation of Cb-128 and Cr-128 means change of hue.
Color saturation is intensity of color, relative to Y-component.
New coefficients including these changes can be got by following expression.
R
G
B
a
11
a
21
a
31
a
12
a
22
a
32
a
13
a
23
a
33
Y
Cb-128
Cr-128
where
,
b
=
b
1
b
2
b
3
=
A
+
b
A
=
Содержание MB86R02
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Страница 216: ...11 9 MB86R02 Jade D Hardware Manual V1 64 0000011 b 4MB 0111111 b 64MB 0000111 b 8MB 1111111 b 128MB ...
Страница 304: ...16 5 MB86R02 Jade D Hardware Manual V1 64 The flow of a read action is shown below Figure 16 5 Read process flow ...
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