How to crop an image using points from pattern matching?

[tei1]

Hi,

I recently started using vision assistant and am trying to crop an image using 2 points (upper right, lower left corners) that I located with the pattern matching function. Using the image mask function, it seems that I can only do this manually though.  Is there any way that I can use my reference points to crop the image automatically?

Thanks,
Tei

[Klemen]

Hello,

is pattern matching only shift invariant? Take a look at IMAQ Extract function. Mind the order of the coordinates input.

Best regards,
K

[ChristopheC]

Hi,

Unfortunately, in Vision Assistant, not many functions support using results from previous steps.

However, the Run LabVIEW step does, and you can create a simple LabVIEW VI that extracts the image, using IMAQ Extract suggested by Klemen. Create an image control and numeric controls (x1, y1, x2, y2) that you connect to the connector pane. Use these controls in the VI to extract the region.

Follow the instructions on the FAQ page to save the VI for source distribution, so that it can be called from the Vision Assistant executable.

Then call it using the Run LabVIEW step in Vision Assistant. From the VI Controls tab, you can associate your previous pattern matching results to the input of the VI, and the image control to the current image.

Sorry it's not more straightforward....

Best regards,

Christophe

[cd11]

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[SimonAldred]

I think you might struggle with NI Vision. In LabView I use IMAQ extract tetragon. ROI coordinates need to be transformed into tetragon coordinates for the input to this VI, but this is relatively straightforward. It is easy to save your NI Vision script as a VI and then add the IMAQ extract tetragon VI. 

Simon