VBAI: How to correct the vignetting?

One of my vision for the future projects will require a very sensitive inspection on a flat surface for the variations in light brightness.

I intend to use a large ceiling fixture for a light almost uniform from all directions and use a lens of the sensor 1 "with a camera imager in a format more small low noise to reduce the effects of vignetting of the lens.

However, even with these steps, I plan, overall image, there will be some amount of variation in the apparent brightness of surfaces.

Clearly, if I was using Labview/Vision I could write a trivial VI to multiply each picture with a picture of correction (with a uniform surface of perfely).

Is there a way to accomplish this effect in VBAI?

Thanks in advance,

Nelson

Vision Development Module 2015, published in August, we've added the new field Correction screw flat that you can use to calculate or estimate the images of flat ground and the acquired images correct with it.

Examples are found here:

\National Instruments\\examples\Vision\Image Processing\Flat field Correction.vi

\National Instruments\\examples\Vision\Image Processing\Flat field Estimation.vi

My recommendation is to try the feature in LabVIEW and see if it works well with your images.

The latest version of the expedition of the VBAI (2014 SP1) which was made available before Vision Development Module 2015 does not yet support this feature. What you can do to use it in this version, is create a VI in LabVIEW 2014 SP1 that implements the Correction on the flat ground and call using the LabVIEW execution step.

It will be natively supported in the next version of 2015 VBAI.

I hope this helps.

Christophe

Tags: NI Hardware

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