參數(shù)資料
型號(hào): 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): 23/166頁
文件大小: 713K
代理商: ΜSAP70732-B03
23
CHAPTER 1 OVERVIEW
(4) DCT
DCT transformation uses the following expression:
DCT
F(u, v ) =
i = 0
j = 0
f (i, j ) cos
{
}
cos
{
}
Reverse DCT
f (i j ) =
C(u )C(v )F(u, v ) cos
{
}
cos
{
}
C (w ) =
(w = 0)
= 1
(w 0)
Generally, this DCT is applied to 8 x 8 elements with signal processing techniques such as JPEG and
MPEG.
DCT disassembles a frequency of cos (n
π
/16) (where n = 0, 1, 2, ... 7) in both the vertical and horizontal
directions.
Generally, relatively few elements of a natural image, such as a photograph, have values, the other
elements tending to have values close to zero when the frequency is disassembled in this way. Even
by approximating those elements having a value close to zero with zero, an image close to the original
can be produced by using the remaining elements. However, the differences between the original image
and an image created in this way are barely visible to the human eye.
1
2
2C(u )C(v )
N- 1
N- 1
(2i+ 1)u
π
(2j+ 1)v
π
N
2N
2N
2
N - 1
N- 1
(2i + 1)u
π
(2j + 1)v
π
N
u = 0
v = 0
2N
2N
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