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): 21/166頁
文件大?。?/td> 713K
代理商: ΜSAP70732-B03
21
CHAPTER 1 OVERVIEW
Figure 1-5. Sampling of Image
With JPEG compression, a sampling ratio of 4:1:1 is used more often than 1:1:1.
At a sampling ratio of 4:1:1, the chrominance component is subjected to less processing than the
luminance component. This is because the human eye is more sensitive to changes in brightness than
changes in color, such that a high compression ratio can be realized by omitting that information which
is difficult for the human eye to detect.
Original 16 x 16 pixel image
YCbCr separation
Sampling
Sampling ratio of 4:1:1 (H:V = 2:2)
Original 8 x 16 pixel image
YCbCr separation
Sampling
Sampling ratio of 2:1:1
Original 8 x 8 pixel image
YCbCr separation and sampling
Sampling ratio of 1:1:1
Original 8 x 32 pixel image
Sampling ratio of 4:1:1 (H:V = 4:1)
Y
Y
Y
Y
Cb
Cb
Cb
Cb
Cr
Cr
Cr
Cr
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