參數(shù)資料
型號(hào)： 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(jī)微控制器
文件頁數(shù)： 17/102頁
文件大小： 282K
代理商： ΜSAP70300-B03
7
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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