at91sam9263 ATMEL Corporation, at91sam9263 Datasheet - Page 971

• Manufacturer Part Number: at91sam9263
• Description: At91 Arm Thumb Microcontrollers
• Manufacturer: ATMEL Corporation

Figure 45-6. Three Frame Buffers Application and Memory Mapping
45.3.5
45.3.5.1
6249D–ATARM–20-Dec-07
Codec Path
Color Space Conversion
Depending on user selection, this module can be bypassed so that input YCrCb stream is
directly connected to the format converter module. If the RGB input stream is selected, this mod-
ule converts RGB to YCrCb color space with the formulas given below:
An example of coefficients is given below:
frame n-1
LCD
Codec Request
frame n
frame n+1
⎧
⎪
⎨
⎪
⎩
Y
C
C
r
b
=
=
C
=
C
Y
0,257 R
r
b
0,439 R
–
0,148 R
=
frame n+2
⋅
–
C
C
⋅
Codec Done
C
⋅
0
3
6
+
–
0,504 G
–
–
–
C
0,368 G
C
C
0,291 G
AT91SAM9263 Preliminary
1
4
7
–
C
C
C
⋅
2
8
⋅
5
⋅
frame n+3
+
×
–
+
0,098 B
0,071 B
G
0,439 B
R
B
+
⋅
Memory Space
Frame Buffer 3
Frame Buffer 0
Frame Buffer 1
ISI config Space
⋅
4:2:2 Image
Full ROI
Cb
Cr
⋅
Y
off
+
off
off
+
frame n+4
+
16
128
128
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