IMAQ Overlay oval shown do not

Hi all

I have a LabVIEW application that I wrote a year ago, and the client wants changed.

In the original app I capture images from a camera and display them to the user.

Due to processing time, I save the images in a binary file, then when the data capture is complete, I re-read and make the association model, calculation of return on investment, edge detection, etc.

During this second phase, once I have defined edges I use "IMAQ Overlay oval VI' to paint the small green ovals on grey scale images to show the edges.

Everything works well.

Because of the economy, and post processing, the user cannot see how efficient the model match/edge detection works until after the data collection is over.

I added a routine preliminary, before quick data entry, to capture the image in grayscale, to pattern matching, detection of contours and layering.

This is going more slowly than the routine collection of data above, but that is normal in preliminary fashion.

I copied the code I use in section 2 above (reason, set the return on investment, find edges, draw layer), to be used in the preliminary routine.

Everything seems to work, but the oval Overlay IMAQ VI attracts not ovals on the image in grayscale.

I actually called you the same Subvi to clear the overlay, and then draw a number of ovals (passed in an array), use in the second routine 'presentation of data' in the old code.

This old code, continues to operate correctly, drawing small circles, etc.

Any ideas on what I should look at to see why recoveries are not displayed?

Thank you

Jeff

Simple mistakes:

First of all, wire of the image by the acquisition stage, not there.  You want to make sure that he finished the acquisition before starting treatment.

Second, move the connection out Image from the drawing of the oval.  Currently, you're never updating the display after you draw ovals.  The program cannot read your mind.  The current sequence is acquire image, image display, draw ellipses.  For best results, you can snapshot.

Overlays are erased when you acquire a new image.  They do not stay when you process the image.

Bruce

Tags: NI Hardware

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