Tablets

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

2. Add the CheckPresence_EdgeAmount filter.

   • Label the outIsPresent as IsKeyFrame.
   • Connect the ReadFilmstrip output to the inImage input of the current one.
   • In Properties window, in the bottom left corner, set the inEdgeScale to 2.
   • Set the inMinAmount to 0.27 to determine the minimum amount of the pixels that should be detected.
   • Click on the CheckPresence_EdgeAmount filter and select the inRoi parameter in the Properties window to mark the region as shown on image below:

3. Add a formula that converts an input image into Nil when no tablets are found:

   KeyFrame = if IsKeyFrame then Image else Nil

4. Add the DetectMultipleCircles filter.

   • Connect the DetectMultipleCircles.inImage input with the Formula.KeyFrame.
   • Set the inRoi as on the image below:

   

   • Set the inRadius to 7 (approximate radius of tablets), the inMaxOverlap to 0 (to avoid overlapping), the inMinScore to 15 (in order not to miss any tablet) and the inEdgeThreshold to 6 (the minimum accepted edge magnitude).

5. Add the CircleBoundingRectangle and connect its inCircle with the DetectMultipleCircles's outCircles

6. Add the CheckPresence_Intensity filter.

   • Connect the Formula.KeyFrame with the inImage.
   • Connect the CircleBoundingRectangle's outBoundingRectangle with the CheckPresence_Intensity's inRoi.
   • Set the inMinContrast to 18 to avoid detecting bad tablets as good ones by checking their contrast.

7. Now create HMI by clicking on HMI Designer in the upper toolbar.

   • Add the View2dBox control and connect the ReadFilmstrip output to its inImage input. It is going to display the images from the production line.
   • Connect the IsPresent with the View2dBox.InStatus1.
   • Connect the TabletCircles with the View2dBox.InData1.

Macrofilter Main