# Edge Constraints

Specify the following parameters:

Parameter | Description
--- | ---
Polarity | The polarity of the edge points to include in the line.
Angle Tolerance | The maximum allowable angle difference between an edge point gradient direction and the normal to the fit line. Increasing this value allows the tool to consider more edge points as inliers while changing the location of the found line segment.
Distance Tolerance | The maximum allowable distance between an inlier and a fitted line. As you increase the edge distance tolerance, you allow the tool to consider more edge points as inliers while changing the location of the found line.