7.5.2.3   Region of Interest

1. Create a ROI by using the buttons Draw Axis-aligned Rectangle or Draw Rotated Rectangle in the tool bar or in the drop-down menu OCR. You can also choose a shape within the Region of Interest section of the Setup tab to create a ROI. The shape of the ROI should be chosen according to the shape of the object to be inspected.

2. After having chosen the ROI shape, you “draw” the ROI in the Graphics Window by keeping the left mouse button pressed. Then, modify the ROI until it has the correct shape. When you are finished, click the right mouse button, to confirm your choice.

3. To select a rotated rectangle with a correct reading direction, check that the arrow that is displayed within the rectangle corresponds to the reading direction of the characters.

All characters that can be read with default parameters within the ROI are displayed immediately.

Note that the ROI should be chosen such that it also contains a small border around the characters to be recognized.

If you have previously prepared and saved an ROI, you can reuse it by selecting Load ROI from the OCR menu.

In order to delete one or more ROIs, you can either mark them and just press the delete button on your keybord or click the buttons for Delete Selected ROI Item or Delete All ROIs on the Setup tab.

You can view and edit the ROI data, which includes all the data about the exact position of the ROI(s), using the tool bar button View ROI Data. Editing an ROI by changing the ROI data is useful if an ROI should be modified more precisely than is possible by drawing in the graphics window.

When you are satisfied with the shape of your ROI, proceed to adjust parameters on the Segmentation tab.