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位單片機微控制器(8位單片微控制器)
文件頁數(shù): 19/166頁
文件大?。?/td> 713K
代理商: ΜSAP70732-B03
19
CHAPTER 1 OVERVIEW
(2) YCbCr/RGB
JPEG compresses/expands images in YCbCr color space. If the image data is not YCbCr but RGB,
processing to transform the RGB data into YCbCr for compression, or that to transform YCbCr data into
RGB before displaying the result of expansion, is added.
The Y of YCbCr is luminance (brightness index), and Cb/Cr is chrominance, a color difference (Cb is the
difference in color tone between green and blue, while Cr is the difference in color tone between green
and red). Transformation between YCbCr and RGB can be illustrated as follows:
Y + 0x80
Cb
Cr
0.29900
-0.16874
0.50000
0.58700
-0.33126
-0.41869
0.11400
0.50000
-0.08131
R
G
B
=
R
G
B
1
1
1
0
1.40200
-0.71414
0
Y + 0x80
Cb
Cr
=
-0.34414
1.77200
Figure 1-4. Outline of JPEG Processing
RGB display
RGB-to-YCbCr
transformation
RGB data
YCbCr-to-RGB
transformation
YCbCr display
Reverse DCT
YCbCr data
Quantization
JPEG data
Huffman compression
Huffman expansion
JPEG file
Reverse
quantization
DCT
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