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參數(shù)資料
| 型號： | μSAP70300-B03 |
| 廠商： | NEC Corp. |
| 元件分類： | 8位微控制器 |
| 英文描述： | 8 Bit Single Chip Microcontrollers |
| 中文描述： | 8位單片機(jī)微控制器 |
| 文件頁數(shù)： | 34/102頁 |
| 文件大?。?/td> | 282K |
| 代理商： | ΜSAP70300-B03 |
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24
μ
SAP703000-B03 USER'S MANUAL
(g) SOS (Start of scan) marker
The SOS segment is also called a scan header. The data constituting a compressed image starts
immediately after the scan header. The scan header specifies the Huffman table number of the
compressed data.
(h) DRI (Define restart interval) marker and RSTn (Restart interval termination) marker
A restart marker is used to minimize the influence of illegal data such as a communication error. A
restart marker is inserted every number of MCUs, as set by the DRI marker.
For example, to insert a marker every four MCUs, restart markers are inserted sequentially, starting
from RST0 and RST1 to RST7, as follows:
[MCU1][MCU2][MCU3][MCU4]RST0[MCU5][MCU6][MCU7][MCU8]RST1 ...
Because the DC coefficient is differential information with JPEG, the preceding DC coefficient is
required to expand an 8 x 8 pixel block. The DC coefficient immediately after a restart marker is a
differential from 0. Consequently, even if data is destroyed in MCU4, MCU5 and subsequent MCUs
can be correctly expanded.
SOS
0xFF
0xDA
Ls
Ns
component-spec.
parameters
Ss
Cs1
Td1 Ta1
Td2 Ta2
Csns
Tans
Cs2
Se
Ah
Al
Tdns
Ls: length of SOS segment
Ns: specifies number of components
Csn: ID of nth component
Tdn: Huffman table number of DC coefficient of nth component
Tan: Huffman table number of AC coefficient of nth component
Ss: fixed to 0 with baseline DCT
Se: fixed to 63 with baseline DCT
Ah: fixed to 0 with baseline DCT
Al: fixed to 0 with baseline DCT
DRI
0xFF
0xDD
Lr
Ri
Lr: length of DRI segment (4)
Ri: restart interval
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