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): 93/166頁
文件大小: 713K
代理商: ΜSAP70732-B03
CHAPTER 2 LIBRARY SPECIFICATIONS
93
(e) Selecting sampling ratio (Sampling)
For the sampling ratio, see
(3)
in
Section 1.2.1
.
This library supports the following four types of sampling ratios.
Table 2-16. Set Value of Member Sampling
Sampling ratio
Identification in library
4:1:1 (H:V = 2:2)
SAMPLE22
4:1:1 (H:V = 4:1)
SAMPLE41
2:1:1 (H:V = 2:1)
SAMPLE21
1:1:1 (H:V = 1:1)
SAMPLE11
These values are defined in file jpeg.h.
Table 2-17. Setting of Sampling Ratio
Sampling ratio
4:1:1
2:1:1
1:1:1
Color
Normal
< >
Clear
File size
Reference value
About 4/3 times
About 2 times
For the luminance component, there is no difference in the image regardless of which sampling ratio
is selected. The sampling ratio influences the image quality of the chrominance component.
(f) Mode (Mode)
Set values and the corresponding operations or modes are shown below.
Table 2-18. Set Values for Member Mode
0
7
6
5
4
3
RFU
HF
QF
MD
Bit
Bit name
Description
7-6
RFU
Reserved field
Note
5
HF
Huffman table initialization flag
Note
0: Initializes the tables.
1: Does not initialize the tables.
4
QF
Quantization table initialization flag
Note
0: Initializes the tables.
1: Does not initialize the tables.
3-0
MD
Mode
0: Compression test mode
1: Normal compression mode
Note
Added in ver. 2.10.
*
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