Loop Position Filtering

## Loop Position Filtering
Filter position information in the input that meets specific conditions.

## Module Principle
This module removes position information that does not meet the conditions based on the running results of internal modules.

### Pre/Post-Sequence Modules
The pre-sequence module for this module is generally a module that outputs a position array, such as Feature Matching, Optimized Feature Matching, or Blob Detection.

## Parameter Configuration Description
### Coordinate System Selection
The initial value of the reference coordinate system.
### Display Loop Count
The maximum number of times to display detection results.
### OK Count Judgment
Judgment of the number of OKs in the detection results.
### Angle Input
* No Angle: Position information does not contain angle information, i.e., angle is considered 0.
* With Angle: Position information contains angle information.
### Reference Image
The background image used when displaying results.
### Test Coordinate System
The position coordinate used during a single test.

## Output Description
### Run Result
Whether the detection was successful.
### Current Index
The current detection count, starting from 1.
### OK Count
The number of OK positions after filtering.
### NG Count
The number of NG positions after filtering.
### Output Coordinate System
The coordinate system composed of the reference position and the current position during each detection.
### Filtered OK Point Array
The array of OK positions after filtering.
### Filtered OK Angle Data
The data of OK angles after filtering. This port does not output when there is no angle.
### Filtered NG Point Data
The array of NG positions after filtering.
### Filtered NG Angle Data
The data of NG angles after filtering. This port does not output when there is no angle.

## Precautions
1. When using this module, the reference position must be learned first so that the ROI of the internal module can follow the position change during detection.
2. The display loop count of this module has a great impact on the detection time and can be adjusted according to the actual situation of the project.

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Click here to jump to the corresponding Chinese manual page: [Loop Position Filtering](/doc/187)