JEITA CP-3451
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E. Frame header (SOF: Start of Frame)
SOF is a marker code indicating the start of a frame segment and giving various parameters for that frame (see
Figure 22).
DQT, DHT, DRI and SOF may line up in any order, but shall be recorded after APP1 (or APP2 if any) and before
SOS.
Address Offset
Code
Meaning
(Hex)
(Hex)
+00
FF
Marker Prefix
+00
C0
SOF
+02
00
Length of field
11
2+1+2+2+1+2*3 = 17 (Bytes)
+04
08
Data precision (bits)
+05
XX
Vertical lines
YY
XXYY (Hex) lines
+07
WW
Horizontal lines
ZZ
WWZZ (Hex) pixels
+09
03
Components
+0A
01
Component number (1:Y)
+0B
21or22
H0 = 2, V0 = 1(4:2:2) or 2(4:2:0)
+0C
00
Quantization designation
+0D
02
Component number (2:Cb)
+0E
11
H1 =1, V1 = 1
+0F
01
Quantization designation
+10
03
Component number (3:Cr)
+11
11
H2 =1, V2 = 1
+12
02
Quantization designation
Figure 22 SOF Structure