Photon Focus MV1-D4096 Series, User Manual, Page: 37 / 125

5.1 Reduction of Image Size
5.1.3 Vertical Decimation
Decimation reduces the number of pixels in y-direction. Decimation in y-direction transfers
every n
th
row only and directly results in reduced read-out time and higher frame rate
respectively.
Decimation can also be used together with ROI or MROI. In this case every ROI
should have a height that is a multiple of the decimation setting. E.g. if decima-
tion=2, then the height of every ROI should be a multiple of 2.
The available decimation values are 2, 6, 10, 14, ...
Fig. 5.4 shows decimation on the full image. The rows that will be read out are marked by red
lines. Row 0 is read out and then every n
th
row.
( 0 , 0 )
( x
m a x
, y
m a x
)
Figure 5.4: Decimation in full image
Fig. 5.5 shows decimation on a ROI. The row specified by the Window.Y setting is first read out
and then every n
th
row until the end of the ROI.
Fig. 5.6 shows decimation and MROI. For every MROI region m, the first row read out is the row
specified by the MROI<m>.Y setting and then every n
th
row until the end of MROI region m.
An example of a high-speed measurement of the elongation of an injection needle is given in
Fig. 5.7. In this application the height information is less important than the width
information. Applying decimation 2 on the original image on the left-hand side doubles the
resulting frame rate.
.
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