Measure the curvature of an object in images

Use the Measure Curve block to measure the curvature (convexity or concavity) or circularity of an object.

To measure the curvature of an object in an image

1. On the Block Definitions toolbar, select Measurement.

   The Measurement list expands.

2. Drag a Measure Curve block onto the Canvas.

   

3. Connect the block to other blocks on the Canvas as needed.

4. Select the Measure Curve block on the Canvas.

5. Right-click the block, and then select Properties.

   

   The Properties side sheet appears on the right side of the screen.

   

6. In the Measure area, select one of the following:

   • Curve – Measure the curvature (convexity or concavity) of an object in an image.

   • Circularity – Measure how circular an object in an image is.

7. In the Threshold Value box, enter the threshold at which the software detects the edges of an object.

   You can set this value between 0 and 255. Values closer to 255 detect only the most well-defined edges. Values closer to 0 detect many edges and may introduce noise.

   You can also use the slider or the increase button () and decrease button () on the same row to change the value.

8. Select Apply Changes.

   The preview image for the block updates on both the Properties side sheet and the Canvas.