Region of Interest (ROI)

If the camera sensor records a larger field of view than required, it is advisable to place a Region of Interest (ROI) on the actually required field of view:

• The sensor can be read out faster, depending on the camera sensor and the selected range.
• The amount of data to be transferred is reduced, which also reduces the data transfer time.
• At the same time, the processing time of all image processing algorithms, which take place over the entire image, is also reduced.
• In addition, image noise can be reduced, making image processing more robust and easier.

Checking the features of the camera Please refer to the manual for the camera to see whether the camera supports corresponding features. The same applies to the feature names that are actually used. The procedure using the feature names according to the GenICam Standard Features Naming Convention (Version 2.4) is described below.

The features for setting a ROI can be found under ImageFormatControl or the corresponding category on your camera:

• WidthMax and HeightMax specify the maximum width and height of the image in pixels. These values may vary depending on other features (e.g. binning).
• Width and Height specify the width and height of the ROI, i.e. the field of view to be viewed, and must be set accordingly.
• OffsetX and OffsetY are used to position the ROI or the field of view. The starting point is the upper left corner of the image.

When setting the features, note that:

• OffsetX + Width <= WidthMax
• OffsetY + Height <= HeightMax