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): 36/102頁
文件大?。?/td> 282K
代理商: ΜSAP70300-B03
26
μ
SAP703000-B03 USER'S MANUAL
(a) Huffman table initialization
The JPEG standard recommends the creation of the following table:
Table 1-5. Recommended Huffman Table
Number of bits
Minimum value of code
Maximum value of code
Number of minimum code
1 bit
Undefined
–1
Undefined
2 bits
0x0
0x0
0x0
3 bits
0x2
0x6
0x1
4 bits
0xE
0xE
0x6
5 bits
0x1E
0x1E
0x7
6 bits
0x3E
0x3E
0x8
7 bits
0x7E
0x7E
0x9
8 bits
0xFE
0xFE
0xA
9 bits
0x1FE
0x1FE
0xB
10 bits
Undefined
–1
Undefined
11 bits
Undefined
–1
Undefined
12 bits
Undefined
–1
Undefined
13 bits
Undefined
–1
Undefined
14 bits
Undefined
–1
Undefined
15 bits
Undefined
–1
Undefined
16 bits
Undefined
–1
Undefined
In the above Huffman code segment, the minimum value of the 3-bit Huffman code is ‘010’ (= 0x02)
while the maximum value is ‘110’ (= 0x06). The minimum code ‘010’ is the second (0x1) of those that
follow ‘00.’
(b) Decoding of DC coefficient
As an example, suppose that the Huffman table segment shown in Table 1-5 is given.
Also suppose that the compressed code has the following value:
0xDA 0x49 (= 1101 1010 0100 1001)
First, the first bit ‘1’ (= 0x1) of the compressed data is compared with the maximum 1-bit value of the
Huffman code table.
0x1 > –1 (maximum 1-bit value of table)
It can be determined, therefore, that the compressed code is not a 1-bit code.
Next, the first 2 bits ‘11’ (= 0x3) are compared with the maximum 2-bit value of the table.
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