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Image Format Control
The focus on the interesting parts of an image can be set by setting the region of interest (ROI)
(see Section 9.1).
The ROI influences the image size which leads into an increased frame rate (see Chapter 11 for
more information about the available frame rate).
9.1 Region of Interest (ROI)
Some applications do not need full image resolution. By reducing the image size to a certain
region of interest (ROI), the frame rate can be increased. A region of interest can be almost
any rectangular window and is specified by its position within the full frame and its width (W)
and height (H).
In MV4 cameras, the ROI width must be a multiple of 16. The ROI height is not
restricted.
In DR4 cameras, the ROI width must be a multiple of 32. The ROI height must be
a multiple of 4.
9.2 Multiple Regions of Interest
The Photonfocus Luxima GigE camera series can handle up to 8 different regions of interest.
This feature can be used to reduce the amount of image data and increase the frame rate. An
application example for using multiple regions of interest (MROI) is a laser triangulation system
with several laser lines. The multiple ROIs are joined together and form a single image, which
is transferred to the acquisition device.
An individual MROI region is defined by its starting value in y-direction and its height. The
starting value in horizontal direction and the width is the same for all MROI regions and is
defined by the ROI settings. The maximum frame rate in MROI mode depends on the number
of rows and columns being read out. Overlapping ROIs are not allowed and no row must be
read out more than once.
The individual ROI in a MROI must not overlap and no row should be included in
more than one ROI.
In the color models, every single ROI should start at an even row and should
contain an even number rows to have a correct Bayer pattern in the output
image.
Fig. 9.1 compares ROI and MROI: the setups (visualized on the image sensor area) are displayed
in the upper half of the drawing. The lower half shows the dimensions of the resulting image.
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Troubleshooting
