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# Approximate Contour

The

`Approximate Contour`

node in AugeLab Studio approximates a given contour with a simplified contour that has a reduced number of edges. It uses the Ramer-Douglas-Peucker algorithm to approximate the contour with fewer vertices while preserving its shape.The

`Approximate Contour`

node takes an input image and a contour as inputs and provides the following outputs:- 1.
**Image**: The input image with the original contour and the approximated contour drawn on it. - 2.
**Contour**: The simplified contour that approximates the original contour. - 3.
**Center**: The center point of the simplified contour. - 4.
**Perimeter**: The perimeter length of the simplified contour. - 5.
**Number of corners**: The number of corners in the simplified contour.

**Node Title**: Approximate Contour**Node ID**: OP_NODE_APPRX_CNTR

The

`Approximate Contour`

node has the following input sockets:- 1.
**Image**: The input image to be displayed with the original and approximated contours. - 2.
**Contour**: The contour to be approximated.

The

`Approximate Contour`

node has the following output sockets:- 1.
**Image**: The input image with the original contour and the approximated contour drawn on it. - 2.
**Contour**: The simplified contour that approximates the original contour. - 3.
**Center**: The center point of the simplified contour. - 4.
**Perimeter**: The perimeter length of the simplified contour. - 5.
**Number of corners**: The number of corners in the simplified contour.

The

`Approximate Contour`

node provides a user interface within AugeLab Studio to adjust the approximation precision. Here are the UI features and interactions:**Approximation Precision**: The node includes a slider labeled "Epsilon" to control the approximation precision. Higher values result in a more simplified contour with fewer vertices, while lower values preserve more details of the original contour.

- 1.Drag and drop the
`Approximate Contour`

node from the node library onto the canvas in AugeLab Studio. - 2.Connect the input image to the
**Image**input socket of the`Approximate Contour`

node. - 3.Connect the contour to be approximated to the
**Contour**input socket of the node. - 4.Adjust the approximation precision using the "Epsilon" slider in the node's user interface.
- 5.Run the pipeline.
- 6.The
`Approximate Contour`

node displays the input image with the original contour and the approximated contour drawn on it. - 7.The simplified contour, center point, perimeter length, and number of corners of the approximated contour are provided as outputs.
- 8.Retrieve the outputs for further analysis, visualization, or other shape analysis tasks in subsequent nodes.

- The
`Approximate Contour`

node simplifies a given contour by reducing the number of vertices while preserving its shape. - The approximation precision can be adjusted using the "Epsilon" slider. Higher values result in more simplified contours with fewer vertices.
- The simplified contour can be used for various shape analysis tasks, such as calculating the area, perimeter, center point, or number of corners of the contour.
- The
`Approximate Contour`

node is useful for reducing the complexity of contours and extracting key shape features for further analysis or visualization.

That concludes the documentation for the

`Approximate Contour`

node in AugeLab Studio. Use this node to approximate contours and extract simplified shape features from an input image.Q