LF2301JC25 データシートの表示（PDF） - LOGIC Devices
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LF2301JC25 Datasheet PDF : 18 Pages
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DEVICES INCORPORATED
LF2301
Image Resampling Sequencer
Static Filter
Static filtering at real-time video
rates can be performed as shown in
Figure 5. This mode is selected by
loading M1-0 with “00” for a clock-
wise spiral walk. A counterclock-
wise spiral walk could be selected
by loading M1-0 with “10.” In this
example, a static filter with a kernel
size of 3 x 3 pixels is desired. Load-
ing K3-0 with “0010” selects a kernel
size of 3 x 3. The first pixel selected
is determined by x0 and y0. In this
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 (F2-0 loaded with
“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
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 x0 and by adding
dy/dv to y0. Since the first pixel of
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.
FIGURE 5. 3 × 3 STATIC FILTER
5
6
7
8
9
4
5
1
2
6
7
8
1 = 1st pixel of 1st spiral walk,
2 = 1st pixel of 2nd spiral walk, etc.
TABLE 5. PARAMETER REGISTERS
ADDR Row (HEX) Column (HEX)
0000
000
000
0001
FFF
FFF
0010
0C0
0C0
0011
000
100
0100
000
000
0101
100
101
0110
000
000
0111
200
201
1000
000
000
1001
000
000
1010
000
000
1011
000
000
1100
000
000
1101
000
000
1110
006
006
1111
007
007
Video Imaging Products
2-7
08/16/2000–LDS.2301-H
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