Photon Focus MV1-D1280-L01-1280-G2-12, User Manual, Page: 43 / 139

5.1 Reduction of Image Size
Usage
The ROI element feature can be enabled as soons as it has been configured properly. The
configuration must be done according to the following procedure:
1. The element height and width must be set, which is applied globally for all elements in
the image.
2. The positons of all elements must be configured. They are indicated by x and y values,
which represents the top left corner of each element. Since all elements in a row must be
located at the same vertical position, for each of the sixteen vertical y positon, up to
sixteen horizontal x position can be configured.
3. The number of horizontal and vertical elements must be configured accordingly
The camera considers the restrictions which are stated in Section 5.1.4. For in-
stances it is not possible to configure elements, which overlaps to each other. A
newly set value will be reset to its old value, if the new configuration ends up in
an overlapped situation.
See Section 8.6 for more information about the configuration of ROI elements.
MROI and ROI Elements
In default configuration, the sensor ROI is set to the smallest possible image height and width
configuration by the camera automatically. This allows a higher frame rate, because the image
lines at the beginning and at the end need not be processed by the FPGA. In order to increase
the frame rate further, the MROI feature can be used together with the ROI elements feature.
The user must take care, that the MROI configuration contains all lines, which are selected by
the ROI elements block.
Configuration Mode
The ROI elements function provides a configuration mode. If enabled, the whole sensor area is
readout and transmitted to the host. However the grey level of the regions, which are not
selected by the ROI elements configuration, is attenuated by two. This allows checking and
adjusting the position of each elements within the sensor area.
Fig. 5.10 illustrates the usage of the configuration mode. The first image shows a situation
without enabled ROI elements feature. There are nine areas, which are region of interests. The
ROI element needs to be configured accordingly in order to expose these nine regions. The
second image shows the camera output after ROI elements configuration, when the ROI
elements configuration mode is activated. When the proper ROI elements configuration is
verified, the ROI elements configuration mode can be deactivated; the camera sends now only
the nine configured regions, which is shown in the last image of Fig. 5.10.
5.1.5 Binning (FPGA)
Description
Binning sums the pixels in subsequent columns and rows, according to the binning
configuration. The result is then divided by the number of binned pixels. The binning feature
will result in images with lower resolution but significantly higher SNR. For instance, 2x2
binning will result in roughly twice the SNR (in bright areas of the image).
Binning is done in the digital domain of the camera.
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