Photon Focus DR1-D3360-192-G2-8, User Manual, Page: 37 / 119

5.1.4 Decimation (color cameras)
Decimation reduces the number of pixels in y-direction by skipping rows. Decimation in color
cameras is slightly different from the monochrome cameras, because the order of the Bayer
pattern must be maintained.
Beginning from the first row, always two rows are read out and then an even number of rows
is skipped. The red rows in Fig. 5.10 are read out and the total number of rows is the sum of
the red rows.
The number of skipped rows for decimation d are:
H
skip
= ( d
−
1)
∗
2
The resulting number or rows for Window.H=h: h
tot
= 2
∗
floor ( h/d ) + min( h mod (2
∗
d ) , 2)
The total number of rows can be read by the property
HeightInterface
.
Decimation H
skip
2 2
3 4
4 6
5 8
Table 5.2: Values of
H
skip
as a function of decimation
Window.H h
tot
, d=2 h
tot
, d=3 h
tot
, d=4
640 320 214 160
1024 512 342 256
1088 544 364 272
2048 1024 684 512
Table 5.3: Examples of total rows in color decimation
D e c i m a t i o n = 2
W
in
d
o
w
.H
H
s k i p
= 2
D e c i m a t i o n = 3
H
s k i p
= 4
Figure 5.10: Example of decimation in color cameras
.
5.1 Reduction of Image Size 37