# Filters in the ViDi GUI

The following table lists the areas within the ViDi GUI where filters are available, and the context in which they are used:

GUI Location | Description | Runtime Setting
--- | --- | ---
View Browser - Display Filter and Sort Filter | Used to return specific views. The Display Filter will only display views which evaluate to True (these expressions all must evaluate to a Boolean result). Pressing the Process button for the tool will only process the views that evaluate to True for the expression. The Sort Filter expressions must evaluate to an integer or a floating point value, and then views can be ordered (either ascending or descending) based on the value returned by the expression. | No
Edit ROI | Following a Blue Locate tool: Either a feature or match filter expression, which is used to determine which feature types or model matches are used to generate the ROIs. Following a Green Classify tool: A view-level filter expression, which determines which views to process. | Yes
Region Filter | This is a Processing Tool Parameters of the Red Analyze tool, which is used to determine which regions are returned by the tool, and in turn, output a downstream ROI that can be consumed by another ViDi tool. In addition, you can also reference view level properties using the view. prefix. However, only a handful of view properties (e.g. width and height) are available at runtime. | Yes
Feature Filter | This is a Processing Tool Parameter of the Blue Locate tool, which is used to determine which features are returned by the tool, and in turn, output a downstream ROI that can be consumed by another ViDi tool. In addition, you can also reference view level properties using the view. prefix. However, only a handful of view properties (e.g. width and height) are available at runtime. | Yes