LF2301 LODEV [LOGIC Devices Incorporated], LF2301 Datasheet - Page 7

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

DEVICES INCORPORATED
Static Filter
Static filtering at real-time video
rates can be performed as shown in
Figure 5. This mode is selected by
loading M
wise spiral walk. A counterclock-
wise spiral walk could be selected
by loading M
example, a static filter with a kernel
size of 3 x 3 pixels is desired. Load-
ing K
size of 3 x 3. The first pixel selected
is determined by x
example, the first pixel is (6,6). In
this case, the LF2301s should ad-
dress consecutive pixels during each
spiral walk. For this to occur, FOV
must be set to 1 (F
“001”).
After the last pixel of a spiral walk
has been selected, the next pixel
address is determined by adding
dx/du to the current X address and
by adding dy/du to the current Y
address (unless the kernel just
3-0
with “0010” selects a kernel
1-0
with “00” for a clock-
1-0
with “10.” In this
2-0
0
and y
loaded with
0
. In this
completed was the last for that line).
At the end of the first spiral walk,
pixel (7,5) is addressed. Since the
first pixel of the next spiral walk
should be (7,6), dx/du is selected to
be 0 and dy/du is selected to be 1.
After the last pixel of the last spiral
walk on the first line has been
selected, the first pixel address of
the second line is determined by
adding dx/dv to x
dy/dv to y
the first spiral walk on the second
line should be (6,7), dx/dv is
selected to be 0 and dy/dv is se-
lected to be 1. Second order differ-
ential terms are not used in this
filter and are therefore set to 0.
UMIN and VMIN are both selected
to be 6. UMAX and VMAX are both
selected to be 7. Table 5 shows the
values loaded into all Parameter
Registers. Table 6 shows the ITS
outputs for the 3 x 3 static filter.
0
. Since the first pixel of
2-7
0
and by adding
Image Resampling Sequencer
ADDR Row (HEX) Column (HEX)
F
T
0000
0001
0010
0011
0100
0101
0110
0111
1000
1001
1010
1011
1100
1101
1110
1111
IGURE
4
5
6
7
8
ABLE
Video Imaging Products
1 = 1st pixel of 1st spiral walk,
2 = 1st pixel of 2nd spiral walk, etc.
5
5. P
5. 3 3 S
FFF
0C0
000
000
000
100
000
200
000
000
000
000
000
000
006
007
6
ARAMETER
1
7
TATIC
2
08/16/2000–LDS.2301-H
R
F
8
LF2301
EGISTERS
FFF
0C0
000
100
000
101
000
201
000
000
000
000
000
000
006
007
ILTER
9