# Identifying Features

When using the Blue Locate tool to identify features, follow these steps:

1. If necessary, adjust the ROI of the tool.
2. Within the ROI, while hovering over the image, the mouse-cursor will have a cross-hairs icon which is used to place the feature label of the Blue tool. Click on a feature to label it.
3. The feature label will have a default character of 0. Enter in a meaningful character (A-Z, 0-9, up to 140 characters) to identify the feature. For identical features, you can use the same identifier.
4. In the bottom-left corner of the display, there is a circle graphic that graphically illustrates the size of the Feature Size parameter setting.

   1. This circle graphic can be moved into the ROI and placed over the largest feature. Then, using the drag handle, you can adjust the Feature Size so that it approximately covers the feature

5. If there is more than one feature that you want to find in the image, identify and label each feature.

6. Go through each image in your image database and identify and label each instance of the feature(s).

   Tip: To ensure the best results, be careful and thorough in this process, ensuring that you identify and label every instance of the feature.
7. Once you have labeled each feature in all of the images, press the Brain icon to train the tool.
8. After training, review the results.
   1. Go through all of the images and determine whether or not the tool correctly marked the features in the image.
      1. If the tool has correctly marked the features, right-click the image and select Accept View.
      2. If the tool has incorrectly marked the features, or failed to identify a present feature:
         1. Right-click the image and select Accept View.
         2. Right-click the image again and select Clear Markings and Labels.
         3. Manually label the features in the image.
   2. If you encountered the scenario in (a.), you are ready to use the tool. If you encountered the scenario in (b.), you will need to retrain the tool and repeat steps 7 and 8.