LF2301JC55 datasheet(7/18 Pages) LODEV

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DEVICES INCORPORATED

Video Imaging Products

2-7

LF2301

Image Resampling Sequencer

08/16/2000–LDS.2301-H

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.

TABLE 5. PARAMETER REGISTERS

ADDR

Row (HEX) Column (HEX)

0000

000

0001

FFF

0010

0C0

0011

000

100

0100

000

0101

100

101

0110

000

0111

200

201

1000

000

1001

000

1010

000

1011

000

1100

000

1101

000

1110

006

1111

007

1 = 1st pixel of 1st spiral walk,

2 = 1st pixel of 2nd spiral walk, etc.

6789

FIGURE 5. 3

××××× 3 STATIC FILTER

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