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Edge-based Template Matching: Gasket

Aim:

Your task is to create a program that can detect the position of a gasket.

Input:

The images of a gasket with varying location and rotation.

The input images are stored in the gasket_inspection directory.

Output:

The location of the object.

Hints:

This exercise demonstrates a way to find an object in an image using Edge-based Template Matching. To use EbTM, please use the LocateSingleObject_Edges1 filter.

Labeling connections is explained in this article.

Solution (FIS):

  1. Add the EnumerateImages filter to theACQUIRE section to load consecutive images from a disk directory.

  2. Add the LocateSingleObject_Edges1 filter to the PROCESS section and connect it with the input image.

  3. Open a template matching editor on inEdgeModel and make sure to select Expert complexity mode in the top right corner. Select the template region as shown in the picture below. Please note that you can select multiple smaller, separate regions for better rotation detection.

  4. Set the range of possible rotations from -20 to +20.

  5. In the next tab mark a reference rectangle as shown in the image below.

  6. Add the outImage and outObject.Match outputs to a data preview.

  7. Perform several iterations of the program and verify if the results are correct.

  8. You may add the AlignRectangle filter and connect outObject.Alignment with inAlignment to get a view of an aligned rectangle to the object.

Further Readings