An attribute that implements recognition by the Hough transform. At the moment recognition of line and circle.

Finds areas with lines or circles.

Not implemented

Not implemented

• Name (string, must be set) attribute unique name
• Type (string, must be "Hough") attribute type
• Weight (double, default: 1) attribute weight
• Probability (double, default: 0.75) not used in that attribute
• Contour (bool, default: true) not used in that attribute

• HoughType (int, default: 0) Hough transform type, 0 for circles and 1 for lines.
• dp (double, default: 1) Special settings for circle recognition. See below.
• md (double, default: 10) Special settings for circle recognition. See below.
• p1 (double, default: 200) Special settings for circle recognition. See below.
• p2 (double, default: 100) Special settings for circle recognition. See below.
• mr (double, default: 0) Special settings for circle recognition. See below.
• Mr (double, default: 0) Special settings for circle recognition. See below.

To obtain special parameters for circle recognition, it is recommended to use the utility hough_circle_params_collector.

<AttributeLib>

    <Attribute Name="HoughCircle" Type="Hough" HoughType="0" dp="1" md="10" p1="142" p2="30" mr="0" Mr="0"/>

</AttributeLib>

<SimpleObjectBase>  
    
    <SimpleObject Name="Circle" ID="20">              
        <Attribute Type="Detect">HoughCircle</Attribute>            
    </SimpleObject>  
    
</SimpleObjectBase>

Unfortunately, the Hough transform is difficult to tweak so that it does not give false positives.

• Circle parameter extraction utility