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参数资料
| 型号： | LF2301JC25 |
| 厂商： | LOGIC DEVICES INC |
| 元件分类： | 数字信号处理外设 |
| 英文描述： | Image Resampling Sequencer |
| 中文描述： | 12-BIT, DSP-VIDEO IMAGING, PQCC68 |
| 封装： | PLASTIC, LCC-68 |
| 文件页数： | 5/18页 |
| 文件大小： | 333K |
| 代理商： | LF2301JC25 |
DEVICES INCORPORATED
Video Imaging Products
2-5
LF2301
Image Resampling Sequencer
08/16/2000–LDS.2301-H
addresses. An example of an ITS
implemented with two LF2301s is
shown in Figure 1. In this system the
following components are used: two
LF2301s, a multiplier-accumulator
(MAC), interpolation coefficient RAM,
and source/target image RAM.
Maximum image size is 4096 x 4096
pixels. Data word size is determined
by the word size of the external RAM.
A typical ITS performs image transfor-
mations as follows:
a. The LF2301s generate sequential
pixel addresses (left to right, top to
bottom) which fill the rectangle in the
target image RAM defined by
(UMIN,VMIN) and (UMAX +1, VMAX).
It is important to note that the U value
of the last pixel address on each line of
the target RAM is UMAX + 1.
b. The LF2301s calculate the address
of the corresponding pixel in the
source image RAM for each target
pixel address generated.
c. If interpolation is needed, the
external MAC sums the products of
the source pixels and the interpola-
tion coefficients. Control signals for
the MAC and address signals for the
interpolation coefficient RAM are
provided by the LF2301s.
d. The new pixel value is written into
the target image RAM.
The LF2301s generate source pixel
addresses according to the following
general second order equations:
x = Au
2
+ Bu + Cuv + Dv
2
+ Ev + F
y = Gu
2
+ Hu + Kuv + Lv
2
+ Mv + N
where (x,y) and (u,v) are the source
and target coordinates respectively.
A through N are user-defined param-
eters. The actual second order equa-
tions used are shown in Figure 3.
dx
du
d x
dudv
2
dx
dv
d x
du
2
2
d x
dv
2
2
m – m
2
2
n – n
2
2
+
=
x
0
m +
n +
mn +
+
x
dy
du
d y
dudv
2
dy
dv
d y
du
2
2
d y
dv
2
2
m – m
2
2
n – n
2
2
+
=
y
0
m +
n +
mn +
+
y
+ FOV CAY(w)
·
FOV m CAY(ker)
·
·
+
+ FOV CAX(w)
·
FOV m CAX(ker)
·
·
+
m
=
u
UMIN +
n
=
v
VMIN +
NOTE:
m – m
2
2
APPROXIMATES THEEXPONENTIAL CHARACTERISTIC OF
m
2
.
F
IGURE
3. A
DDRESS
T
RANSFORMATION
E
QUATIONS
F
IGURE
2. T
EST
M
ODE
D
ATA
R
OUTING
SIGN
7
4
12
1
CA
3-0
CA
7-4
X
11-0
/T
11-0
28-BIT INTERNAL
ACCUMULATOR
WALK COUNTER
4
4
12
12
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相关代理商/技术参数 |
参数描述 |
|---|---|
| LF2301JC55 | 制造商:LOGIC 制造商全称:LOGIC 功能描述:Image Resampling Sequencer |
| LF2301JC66 | 制造商:未知厂家 制造商全称:未知厂家 功能描述:Video Sequencer |
| LF-230FU | 制造商:NEC 制造商全称:NEC 功能描述:Noise Filters |
| LF-230N | 制造商:NEC 制造商全称:NEC 功能描述:Noise Filters |
| LF-230P | 制造商:NEC 制造商全称:NEC 功能描述:Noise Filters |
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