參數資料
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: 49/102頁
文件大?。?/td> 282K
代理商: ΜSAP70300-B03
39
CHAPTER 2 LIBRARY SPECIFICATIONS
(3) Sampling ratio (1)
Compression
Four sampling ratios are supported: 4:4:4 [H:V = 1:1], 4:2:2 [H:V = 2:1], 4:1:1 [H:V = 2:2],
and 4:1:1 [H:V = 4:1].
This information is appended to the JPEG header.
Expansion
Four sampling ratios are supported: 4:4:4 [H:V = 1:1], 4:2:2 [H:V = 2:1], 4:1:1 [H:V = 2:2],
and 4:1:1 [H:V = 4:1].
The sampling ratio used is automatically identified and, therefore, can be ignored by the
user.
Table 2-1. Sampling Ratios
Sampling ratio
4:1:1
4:2:2
4:4:4
Color
Normal
Fairly clear
Clear
File size
Reference value (x1)
About x4/3
About x2
(4) Restart marker
Compression
Whether restart markers are used can be selected.
To use restart markers, any value can be specified.
Expansion
The value of the DRI header is used.
(5) Screen size (horizontal, vertical)
Compression and expansion
The sizes that can be set are as follows:
Table 2-2. Screen Sizes
Sampling ratio
Holizontal
Vertical
4:4:4 [H:V = 1:1]
Multiple of 8
Multiple of 8
4:2:2 [H:V = 2:1]
Multiple of 16
Multiple of 8
4:1:1 [H:V = 2:2]
Multiple of 16
Multiple of 16
4:1:1 [H:V = 4:1]
Multiple of 32
Multiple of 8
(6) Coordinates (x, y)
Compression and expansion
Assuming that a VRAM specification for both YCbCr/RGB, image
data can be expanded at any point in VRAM, and also compressed
at any point in VRAM.
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