Training Characters

Use the Train/Read tab to open images and train characters, and save the character values to a character set file.

Complete the following steps to train characters:

1. Access the OCR Training Interface.
2. Select File»Open Images, and select the image or images you want to use for training. You can select multiple image files by pressing the <Ctrl> key and clicking each file. You can also enable the Select all files checkbox to open all images in the directory you specified.
3. Click Open.
4. Use the navigation buttons to locate the image you want to use for training.
5. On the image, draw an ROI around the characters you want to train.

   Tip  You can modify the view of the image if necessary.

   The OCR Training Interface segments objects in the ROI, drawing character bounding rectangles around them according to the settings on each of the tabs at the bottom of the training interface. Any object that is surrounded by a character bounding rectangle is a segmented object.

   On the Train/Read tab, Text Read displays recognized characters and the substitution character based on the character set file you are using. If you have not opened a character set file, Text Read displays the substitution character for each of the segmented objects in the ROI. For example, if the ROI contains three segmented objects, Text Read contains three substitution characters.

   You can specify the substitution character in the Read Options tab.

6. Use the Threshold, Advanced Threshold, Size & Spacing, and Read Options tabs to set up the parameters you want to use in the training process. Adjust threshold methods and settings and make changes in the other tabs to configure OCR to draw character bounding rectangles around objects in the ROI appropriately. OCR displays objects in blue.
7. Select the Train All Characters option.
8. In the Correct String textbox, enter the character values you want to associate with each of the objects in the ROI you specified. The number of character values you enter must match the number of objects found in the ROI.
9. Click Train.
10. If Text Read displays incorrect characters, adjust the parameters on the Threshold, Advanced Threshold, and Size & Spacing tabs to improve the results.
11. Repeat steps 3 through 10 to train additional characters.
12. Select File»Save Character Set File, enter a name for the character set file, and click Save.
13. Use the navigation buttons to view each image. Ensure that Text Read displays the correct characters for each image. If Text Read displays the substitution character or an incorrect character, adjust the parameters on the Read Options tab and/or train the incorrect characters, and then save the character set file.