# Optimizing Green Classify Labeling

Before starting label check for the Green Classify tool, you must fulfill the following prerequisites:

- The tool must have two or more classes.

- Each class must have five of more labeled views.

To start label check:

1. On the View Browser, click Check to start the label quality check.

2. Click Start to begin the label check.

   The quality check runs on all labeled views, not on the unlabeled views in the current workspace. As the label check runs only on the labeled views, you cannot remove, rename, clear, or accept labeled views. Also, you cannot train a tool during the label check. To get the label for each view A view of an image is a region of pixels in an image. Tool processing is limited to the pixels within the view. You can manually specify a view, or you can use the results of an upstream tool to generate a view., the label check task should not be paused or interrupted.

   You can still label, remove, rename, clear, or accept views that were not labeled when the label check is running.

   Views Running Label Check in Browser Grid Mode | Views Running Label Check in Browser List Mode

3. Once the label quality check is completed, the label quality value (0~100) is displayed in the Label Quality column of the Browser List mode. The higher the label quality, the better the label is.

   Note: The label quality values of some views with correct labels can be lower than those of the views with incorrect labels, but overall you can find incorrect labels much more frequently on the views with lower quality values.
   Note: The range of absolute quality values differs by the image data you use as the quality value distribution over all views differs by image.

   Mislabeled View with Low Label Quality Value

4. Click the header of the Label Quality column to sort the views in ascending order, then check the views with low quality values.

5. Modify the incorrect labels. You can directly change a label on the image display area or with the right-click menu on View Browser. For this, select Clear Views and Labels to clear the existing label, then select Label Views to add a new label.

   If modify or delete the label of a view after the quality check, the value in the Label Quality column for this view is removed and displayed in the Memo column instead.

6. Train and process the tool and check the improvement of the results.

   Before Correcting Labels | After Correcting Labels with Label Check