Detect Edge Point

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Description

This Step is used to detect a qualifying edge point along the longitudinal centerline of the specified region in the input image.

Usage Scenario

This Step is a general geometric feature detection Step.

Input and Output

Input

Input Port	Data Type	Description
Image	Image	The image used for detecting an edge point.
Alignment Parameter Group	Pose2D	Used to adjust the target region’s pose in sync with the target object’s pose changes.

Input Port

Data Type

Description

Image

The image used for detecting an edge point.

Alignment Parameter Group

Pose2D

Used to adjust the target region’s pose in sync with the target object’s pose changes.

Output

Output Port	Data Type	Description
Edge Point	Shape2D/Point	The detected edge point.
Edge Point X	Number	The X coordinate of the edge point.
Edge Point Y	Number	The Y coordinate of the edge point.

Output Port

Data Type

Description

Edge Point

Shape2D/Point

The detected edge point.

Edge Point X

Number

The X coordinate of the edge point.

Edge Point Y

Number

The Y coordinate of the edge point.

Parameter Description

Parameter	Description
ROI Settings	You can draw a rectangular ROI, and a column of pixels from its center is extracted for edge point detection.
Filter Window Size	This parameter specifies the window size used for filtering along the direction of the extracted column of pixels . Filtering can reduce noise and improve the stability of edge detection results.
Gray Value Change Threshold	An edge point is detected in an extracted pixel column only if the gray value change between adjacent pixels at the edge is greater than or equal to this threshold. A properly set parameter filters out weak edges and noise.
Edge Polarity	This parameter specifies the direction of the gray value change at the edge. Value list: Dark to light: Detects edges where gray value change from low to high, visually transitioning from dark to light. Light to dark: Detects edges where gray value change from high to low, visually transitioning from light to dark. Any: No restriction on the direction of gray value change at the edge, detecting both.

Parameter

Description

ROI Settings

You can draw a rectangular ROI, and a column of pixels from its center is extracted for edge point detection.

Filter Window Size

This parameter specifies the window size used for filtering along the direction of the extracted column of pixels . Filtering can reduce noise and improve the stability of edge detection results.

Gray Value Change Threshold

An edge point is detected in an extracted pixel column only if the gray value change between adjacent pixels at the edge is greater than or equal to this threshold. A properly set parameter filters out weak edges and noise.

Edge Polarity

This parameter specifies the direction of the gray value change at the edge.

Value list:

Dark to light: Detects edges where gray value change from low to high, visually transitioning from dark to light.
Light to dark: Detects edges where gray value change from high to low, visually transitioning from light to dark.
Any: No restriction on the direction of gray value change at the edge, detecting both.

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Detect Edge Point

Description

Usage Scenario

Input and Output

Input

Output

Parameter Description

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