ViDi Suite and VisionPro Deep Learning provide a filter grammar that allows you to construct expressions that filter the data in your ViDi stream in extremely flexible ways. These filter expressions are available in many different locations within the UI, as well as at run time.
The Deep Learning filter grammar allows you to write expressions that will evaluate to a Boolean, integer, or floating point value for each view in the current stream database.
The filter grammar includes variables that are defined for views. You use these simply by including them in an expression that evaluates to a Boolean result :
In addition to view-level variables, the grammar also supports tool-specific axis-level variables that you can to filter views based on the presence, absence, or values of individual markings, labels, and other view elements. Blue tool views, for example, include a feature axis for filtering based on individual features in the view. Axis-level filters are entered within square brackets following the axis name :
The following table summarizes the contexts in which filter expressions are available. Some of them can also be used during runtime to filter results :
| Notes | Runtime setting | |
View Browser - Display Filter and Sort Filter  | Display Filter:
Sort Filter:
| No |
| ROI definition (Upstream Blue Tool and Green Tool) | Following a Blue Locate tool :
 Following a Green Classify tool :
 | Yes |
Region Filter (Red Tool)  | Red Analyze tool :
| Yes |
Feature Filter (Blue Tool)  | Blue Locate tool :
| Yes |
Database Overview Filter (Expert Mode only)  |
|