at91sam9260-cj ATMEL Corporation, at91sam9260-cj Datasheet - Page 685

• Manufacturer Part Number: at91sam9260-cj
• Description: At91 Arm Thumb Microcontrollers
• Manufacturer: ATMEL Corporation

Figure 39-6. Three Frame Buffers Application and Memory Mapping
39.3.5
39.3.5.1
6221G–ATARM–31-Jan-08
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
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
AT91SAM9260
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