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Plate Measurement

Aim:

The aim of the program is to measure the length of a metal plate.

Input:

An image of a metal plate.

Output:

Calculated distance between horizontal edges.

Hints:

The solution of this problem is immediate if a proper filter for measuring object width is used.

Labeling connections is explained in this article.

Solution (AVS):

  1. In Workspace Explorer, open the workspace Examples, and in the Filmstrip window, select the Plate dataset. Drag the Image channel to the ACQUIRE section.

  2. Add the MeasureObjectWidth filter.

  3. Connect outImage with the inImage.

  4. Click on the MeasureObjectWidth filter and make the following changes in Properties window (in the bottom left corner):

    • Click the "..." button at the inScanField input to open the GUI for specifying the scanning field.
    • Set the scanning field as it is shown in the image below. Please remember that ScanField defines a rectangular field in which a series of scans will be performed.
    • Set the inScanCount to 20 to increase the number of scanning segments that are used to detect the horizontal edges of the plate.
    • Set the inStripeScanParams.StripePolarity to Bright as the plate is brighter than the background.
    • Set the inStripeScanParams.MinStripeWidth to 500 to reject noise, which is narrower than the object.

Macrofilter Main

Used Filters

Icon Name Description
MeasureObjectWidth Measures the width of an object using stripe detection.

Further Readings