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位單片機微控制器
文件頁數(shù): 31/102頁
文件大小: 282K
代理商: ΜSAP70300-B03
21
CHAPTER 1 OVERVIEW
(d) DHT (Define Huffman table(s)) marker
This marker defines a Huffman table.
Example
00, 01, 05, 01, 01, 01, 01, 01, 01, 00, 00, 00, 00, 00, 00, 00
If L1 through L16 are as shown above, the meaning is as follows:
Zero 1-bit code
One 2-bit code, 00
Five 3-bit codes, 010, 011, 100, 101, and 110
One 4-bit code, 1110
One 5-bit code, 11110
One 6-bit code, 111110
One 7-bit code, 1111110
One 8-bit code, 11111110
One 9-bit code, 111111110
No other codes
V1 through Vm are the corresponding Huffman codes. For example, the Huffman code corresponding
to compressed code ‘010’ is V2 (in this case, ‘010’ is the second compressed code).
DHT
0xFF
0xC4
Lh
Tc Th
V1
L16
Vm
L1
L2
V2
Lh byte
multiple
Lh: length of DHT segment
Tc: 0 = DC, 1 = AC
Th: Huffman table number (0, 1)
L1 to L16: indicates how many Huffman codes of i bits in length exist
V1 to Vm: corresponding Huffman code
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