參數(shù)資料
型號: μSAP70732-B03
廠商: NEC Corp.
英文描述: 8 Bit Single Chip Microcontrollers(8位單片微控制器)
中文描述: 8位單片機(jī)微控制器(8位單片微控制器)
文件頁數(shù): 27/166頁
文件大?。?/td> 713K
代理商: ΜSAP70732-B03
27
CHAPTER 1 OVERVIEW
Table 1-3. Values of DC/AC Components and Bit Length
Value of component
Category
0
0
-1, 1
1
-3, -2, 2, 3
2
-7 to -4, 4 to 7
3
-15 to -8, 8 to 15
4
-31 to -16, 16 to 31
5
-63 to -32, 32 to 63
6
-127 to -64, 64 to 127
7
-255 to -128, 128 to 255
8
-511 to -256, 256 to 511
9
-1023 to -512, 512 to 1023
10
-2047 to -1024, 1024 to 2047
11
In JPEG compression, entropy compression of the values in this category is performed.
For example, suppose the Huffman table for the DC component for luminance (Y) follows the convention
shown below:
Huffman compressed code 00 (2 bits) is allocated to a value 0 bits long.
Huffman compressed code 010 (3 bits) is allocated to a value 1 bit long.
Huffman compressed code 011 (3 bits) is allocated to a value 2 bits long.
Huffman compressed code 100 (3 bits) is allocated to a value 3 bits long.
Huffman compressed code 001 (3 bits) is allocated to a value 4 bits long.
.
.
.
If the difference in the DC component of the block of the Y component (difference from the DC component
of the block of the preceding Y component) is “-3,” “-3” is encoded as follows, because it belongs to category
2.
Huffman compressed code of category 2: 011 (3 bits)
Lower 2 bits of “-3” with sign inverted:
3 + 2 = 5 bits
00
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