Table Of Contents
Setup Match Geometric Pattern 1 (G Dataflow)
Sets parameters used during the matching process of feature-based geometric pattern matching.
Run this node before using the Match Geometric Pattern node.
match mode
Cluster identifying the conditions under which you want the node to find template matches.
Set the values for these conditions in the range settings array. Disabling any of these conditions or limiting their ranges decreases the search time.
Rotation
Boolean that specifies when the node searches for occurrences of the template in the inspection image, allowing for template matches to be rotated.
| TRUE | Searches for occurrences of the template in the inspection image, allowing for template matches to be rotated. |
| FALSE | Does not search for occurrences of the template in the inspection image. |
Scale
Boolean that specifies when the node searches for occurrences of the template in the inspection image, regardless of if possible matches are of a different size in the inspection image.
| TRUE | Searches for occurrences of the template in the inspection image, regardless of if possible matches are of a different size in the inspection image. |
| FALSE | Does not search for occurrences of the template in the inspection image. |
The default scale range is 75% to 125%.
Occlusion
Boolean that specifies when the node searches for occurrences of the template in the inspection image, allowing for a specified percentage of the template to be occluded.
| TRUE | Searches for occurrences of the template in the inspection image, allowing for a specified percentage of the template to be occluded. |
| FALSE | Does not search for occurrences of the template in the inspection image. |
The default occlusion range is 0% to 25%.
curve parameters
Cluster containing information about how curves are extracted from the inspection image during the match phase.
The Setup Match Geometric Pattern node ignores these settings if use learn curve parameters is set to TRUE.
Extraction Mode
Input that specifies how the node identifies curves in the image.
| Name | Value | Description |
|---|---|---|
| Normal | 0 |
(Default) Select if you want the node to make no assumptions about the uniformity of objects in the image or the image background. |
| Uniform Regions | 1 |
Select if you want the node to assume that either the objects in the image or the image background consist of uniform pixel values. This allows the node to more accurately calculate the external curves of the objects. |
Edge Threshold
Minimum contrast a seed point must have for it to begin a curve.
Valid values range from 1 to 255.
Default: 75
Edge Filter Size
Width of the edge filter that the node uses to identify curves in the image.
| Name | Value | Description |
|---|---|---|
| Fine | 0 |
Sets to fine edge filter size. |
| Normal | 1 |
(Default) Sets to normal edge filter size. |
| Contour Tracing | 2 |
Sets to contour tracing edge filter size, which provides the best results for contour extraction but increases the time required to process the image. |
Min Length
Length, in pixels, of the smallest curve that you want the node to identify.
The node ignores any curves that have a length less than this value.
Default: 25
Row Search Step Size
Distance, in the y direction, between the image rows that the algorithm inspects for curve seed points.
Valid values range from 1 to 255.
Default: 15
Col Search Step Size
Distance, in the x direction, between the image columns that the algorithm inspects for curve seed points.
Valid values range from 1 to 255.
Default: 15
Max Endpoint Gap
Maximum gap, in pixels, between the endpoints of a curve that the node identifies as a closed curve.
If the gap is larger than this value, the node identifies the curve as an open curve.
Default: 10
Closed
subpixel accuracy?
use learn curve parameters
Boolean value that specifies whether to use the curve parameters from the Setup Learn Geometric Pattern node or the Advanced Setup Learn Geometric Pattern node to extract the target curves during the match phase.
| TRUE | Uses the curve parameters to extract the target curves during the match phase. |
| FALSE | Does not use curve parameters to extract the target curves during the match phase. |
Default: TRUE
error in
Error conditions that occur before this node runs.
The node responds to this input according to standard error behavior.
Standard Error Behavior
Many nodes provide an error in input and an error out output so that the node can respond to and communicate errors that occur while code is running. The value of error in specifies whether an error occurred before the node runs. Most nodes respond to values of error in in a standard, predictable way.
Default: No error
range settings
Array of the acceptable ranges for each match constraints option.
To decrease the search time, limit the range of these constraints as much as possible.
Match Constraints
Match option whose values you want to constrain by the given range.
| Name | Value | Description |
|---|---|---|
| Rotation Angle (degrees) | 0 |
Set a range for this option to specify the angles at which you expect the node to find template matches in the inspection image. The node ignores this range if the Rotation is not enabled. |
| Scale Factor (%) | 1 |
Set a range for this option to specify the sizes at which you expect the node to find template matches in the inspection image. The size is expressed as the following percentage: the size of the match divided by size of the template image, multiplied by 100. The node ignores this range if the Scale is not enabled. |
| Occlusion (%) | 2 |
Set a range for this option to specify the amount of occlusion you expect for a match in the inspection image. Matches that have up to 50% occlusion are accurately detected. The node ignores this range if the Occlusion is not enabled. |
Min
Minimum value of the range for a given match constraint.
Max
Maximum value of the range for a given match constraint.
match geometric pattern 1 setup data
String that contains information about the setup parameters for the matching phase.
Connect this output to the Match Geometric Pattern 1 node or the Advanced Setup Match Geometric Pattern 1 node.
error out
Error information.
The node produces this output according to standard error behavior.
Standard Error Behavior
Many nodes provide an error in input and an error out output so that the node can respond to and communicate errors that occur while code is running. The value of error in specifies whether an error occurred before the node runs. Most nodes respond to values of error in in a standard, predictable way.
Where This Node Can Run:
Desktop OS: Windows
FPGA: Not supported
Web Server: Not supported in VIs that run in a web application