LF2301 LODEV [LOGIC Devices Incorporated], LF2301 Datasheet - Page 5

• Manufacturer Part Number: LF2301
• Description: Image Resampling Sequencer
• Manufacturer: LODEV [LOGIC Devices Incorporated]

DEVICES INCORPORATED
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:
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
y = Gu
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.
a. The LF2301s generate sequential
2
2
+ Bu + Cuv + Dv
+ Hu + Kuv + Lv
2
2
+ Mv + N
+ Ev + F
F
F
IGURE
IGURE
x
y
u
v
NOTE:
=
+ FOV CAX(w)
=
+ FOV CAY(w)
=
=
28-BIT INTERNAL
WALK COUNTER
ACCUMULATOR
x
y
UMIN +
VMIN +
2. T
3. A
0
0
+
+
SIGN
m – m
·
·
2
EST
dx
du
dy
du
2
DDRESS
m
n
2-5
m +
m +
M
APPROXIMATES THE EXPONENTIAL CHARACTERISTIC OF
12
1
4
7
ODE
+
+
T
FOV m CAX(ker)
FOV m CAY(ker)
dx
dv
dy
dv
RANSFORMATION
D
ATA
n +
n +
·
·
R
·
·
Image Resampling Sequencer
dudv
dudv
OUTING
d x
d y
2
2
mn +
mn +
E
Video Imaging Products
QUATIONS
4
4
12
12
d x
d y
du
du
2
2
2
2
m – m
m – m
2
2
2
2
+
+
X
CA
CA
d x
d y
11-0
dv
dv
08/16/2000–LDS.2301-H
2
2
7-4
3-0
2
2
/T
LF2301
11-0
n – n
n – n
m
2
2
2
2
2
.