VT Camera Link series
Page 37 of 88
VW40-161-001
9.4
Region of Interest
The Region of Interest (ROI) feature allows you to specify a portion of the sensor lines. During operation, only
the pixel information from the specified portion of the lines are read out of the sensor and transmitted from the
camera to the frame grabber.
The ROI is referenced to the left end of the sensor array. The location and size of the ROI is defined by declaring
the
Offset X
and
Width
settings. For example, suppose that you set the Offset X parameter to 16 and the Width
parameter to 256 as shown in the figure below. With these settings, the camera will read out and transmit pixel
values for pixels 17 through 272.
Figure 9.2 Region of Interest
9.4.1
Setting the ROI
By default, the ROI is set to use the full resolution of the camera
’s imaging sensor. You can change the size and
location of the ROI by changing the Offset X and Width parameter values.
When you are setting the camera
’s region of interest, you must consider the following guidelines:
The sum of the Offset X and Width setting values must not exceed the width of the camera’s imaging
sensor. For example, on the VT-12K5C camera, the sum of the Offset X and Width setting values must not
exceed 12480.
The Offset X setting value can be set to 0 and can be increased in increments of 16. The Width setting
values must be a minimum of 256 and can be set to a multiple of 16.
Your Camera Link frame grabber may place additional restrictions on how the ROI location and
size must be set. Refer to your Camera Link frame grabber user manual for more information.