Zebra Aurora User Guide

Edges

The Edge tool compares edges given input image with an image stored in a model created in the Training tab. As a result, the tool creates a region containing only pixels with different edges.

This method helps find defects in the object's shape. Due to its resilience against pixel gray level changes, it is helpful in applications with changing light conditions.

Parameter Maximum Distance defines the maximum distances of two edges that should be treated as the same edge.

The

Edge Threshold

and

Edge Hysteresis

parameters in the

Inspection

tab should have the same value as in the

Training

tab.

Increasing the Edge Hysteresis connects more pixels by detecting edges.

If the input image's brightness significantly differs from the brightness of the golden image used in the

Training

tab.

Decrease the

Edge Threshold

slightly to concentrate on missing edges or increase the value to focus on excessive edges.

Edges Settings
Setting	Description
Edge Threshold	Determine a sufficient edge strength. Edges of at least 30 are detected on the input image.
Edge Hysteresis	Determine the value by which the edge threshold decreases for edge points neighboring sufficiently strong edges. Use this parameter to control how weak adjacent pixels can be connected to a strong pixel. A higher value connects more pixels.
Smoothing	Determine the tool's amount of horizontal and vertical smoothing to improve edge detection.