
IMAGE SENSOR SOLUTIONS
Functional Description (continued)
3.0
READ OUT MODES
3.2 Interlaced Readout Mode
In interlaced readout mode, pixels are read out in two fields, an
3.1 Progressive Scan Readout Mode
In progressive scan readout mode, every pixel in every row in
the display window is consecutively read out, one pixel at a time,
starting with the left most pixel in the top most row. Hence, for
the example shown in Figure 14, the read out order will be
a0,b0,...,r0 then a1,b1,...,r1 and so on until pixel r20 is read out.
Odd Field followed by an Even Field .
The Odd Field, consisting of all odd rows contained within the
display window, is read out first. Each pixel in the “ Odd Field ” is
consecutively read out, one pixel at a time, starting with the top
left most pixel.
The Even Field, consisting of all even rows contained within the
display window, is then read out. Each pixel in the “ Even Field ”
0
1
Column/Horizontal
a b c d e f g h i j k l mn o p q r
is consecutively read out, one pixel at a time, starting with the
top left most pixel.
Notes:
2
3
4
5
6
7
8
9
10
11
12
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14
15
16
17
18
19
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Figure 14: Progressive Scan Read Out Mode
Note a: When using a monochrome sensor in interlace mode,
the InterlaceMode bit in the MCFG1 register should
be set to a logic one.
Note b: A Scan Window with an odd number of rows,must be
defined when using interlace readout mode.
F igure 15 shows a “ Scan Window ” of 21 rows and a “ Display
Window ” of 21 rows and 18 columns. This is broken up into two
fields:
? The odd field is read out first. The odd field will consist of pix-
els a0,b0,...,r0 ; a1,b1,...,r1 ; ... ; a17,b17,...r17 as shown in fig-
ure 15.
? The even field is then read out. The even field will consist of
pixels a2,b2,...,r2 ; a3,b3,...,r3 ; ... ; a19,b19,...,r19 as shown
in figure 15.
Column/Horizontal
a b c d e f g h i j k l mn o p q r
0
2
4
6
8
10
12
14
16
18
20
Odd Field
1
3
Column/Horizontal
a b c d e f g h i j k l mn o p q r
5
7
9
11
13
15
17
19
Even Field
Figure 15. Interlace Read Out
Hence, for the example shown in Figure 15, the display window
is broken up into two fields, as shown in Figure . Pixels
a0,b0,...,r0 followed by a2,b2,...,r2 and so on until pixels
a20,b20,...r20 in the even field are read out first. The even field
read out is followed by pixels in the odd field, a1,b1,...,r1 then
a3,b3,...,r3 until pixels a19,b19,...,r19.
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13
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