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4.3 Reduction of Image Size
4.3 Reduction of Image Size
With Photonfocus cameras there are several possibilities to focus on the interesting parts of an
image, thus reducing the data rate and increasing the frame rate. The most commonly used
feature is Region of Interest (ROI).
4.3.1 Region of Interest (ROI)
Some applications do not need full image resolution (e.g. 1024x1024 pixels). By reducing the
image size to a certain region of interest (ROI), the frame rate can be drastically increased. A
region of interest can be almost any rectangular window and is specified by its position within
the full frame and its width and height. Fig. 4.16 gives some possible configurations for a
region of interest, and Table 4.2 shows some numerical examples of how the frame rate can be
increased by reducing the ROI. Table 4.3 shows the frame rate as a function of the read out
mode and the exposure time.
Both reductions in x- and y-direction result in a higher frame rate.
a
)
b ) c ) d )
Figure 4.16: ROI configuration examples
ROI Dimension MV1-D1024E-160-CL
1024 x 1024 149 fps
512 x 512 586 fps
256 x 256 2225 fps
128 x 128 7780 fps
128 x 16 36065 fps
Table 4.2: Frame rates of different ROI settings (minimal exposure time; CFR off, skimming off and sequen-
tial readout mode).
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