PXD20RM Datasheet, PDF (1556/1628 Pages) Freescale Semiconductor, Inc – PXD20 Microcontroller

Table 47-4. LUMA_COMP Fields
Field
Y_RED[9:0]
Y_GREEN[9:0]
Y_BLUE[9:0]
Luminance coefficient for red matrix.
Luminance coefficient for green matrix.
Luminance coefficient for blue matrix.
Description
The RGB pixel value is computed using following formulae:
Red
=
_---Y_------–_----1_---6_----_---_---y_----r_--e_---d_-
512
+
_---C_----r_----–_----1_---2_---8_----_--C_----r_---r_--e_---d_--
512
+
_---C_----b_-----–_----1_---2_---8_----_--C_----b_----r_--e_---d_--
512
Eqn. 47-1
Green = ^---^Y------^–----¹---⁶----^---^---^Y-----^g---^r---^e---^e---ⁿ- + ^---^C----^r----^–----¹---²---⁸----^--^C----^r---^g---^r---^e---^e---ⁿ- + -^--^C----^b-----^–----¹---²---⁸----^--^C----^b----^g---^r---^e---^e---ⁿ-
512
512
512
Eqn. 47-2
Blue = ^---^Y------^–----¹---⁶----^---^---^y----^b---^l--^u---^e- + ^---^C----^r----^–----¹---²---⁸----^--^C----^r---^b---^l--^u----^e- + ^---^C----^b-----^–----¹---²---⁸----^--^C----^b----^b---^l--^u----^e-
512
512
512
Eqn. 47-3
The multiplications with Y_red, Y_green, and Y_blue are unsigned multiplications. The multiplications
with Cr_red, Cb_red, Cr_green, Cb_green, Cr_blue, and Cb_blue are signed multiplications. The addition
is saturated to prevent overflow.
47.2.3.3 CHROMA_RED
Offset 0x08
0
1
2
3
4
5
6
7
8
9
10
11
R
CR_RED[10:0]
W
Reset 0
0
0
0
0
0
1
1
0
0
1
1
16
17
18
19
20
21
22
23
24
25
26
27
R
CB_RED[11:0]
W
Reset 0
0
0
0
0
0
0
0
0
0
0
0
= Unimplemented or Reserved
Figure 47-4. CHROMA_RED Register
Access: User read/write
12
13
14
15
0
0
0
1
28
29
30
31
0
0
0
0
Table 47-5. CHROMA_RED Fields
Field
Description
CR_RED[10:0]
CB_RED[11:0]
Cr coefficient for red matrix.
Cb coefficient for red matrix.
47-8
PXD20 Microcontroller Reference Manual, Rev. 1
Preliminary—Subject to Change Without Notice
Freescale Semiconductor