crack

Hello

I'm working on my M.Vision project which aims to determine the total length of the cracks on a piece of mud brick (fig. 1)

I have Imaq & Labview 8.2.1 in this project.

After the application of some such filters that extract RGB, threshold,..., the skeleton of the extracted cracks (fig. 4), then I used the detection function form to determine the total length of the cracks by adding the length of each line has resulted.

In fact, after you have created the VI by Imaq, we're out of length parameter in the labview.

Anyway, my issues in this project are:

I don't why shape detection missed some parts of the skeleton (fig. 2) and on the other hand, the overlap of the lines has occurred in some areas (fig. 3). of course, I remember that my script is attached as best.scr.

now, how can I rearrange the form detection settings to achieve the highest precision?

* I wonder if someone could help me understand the significance of the detection of form function parameters that are listed in fig. 5 and their effects on my result.

* In your opinion, is there a better method to determine the total length of the cracks in my image?

* Note that: I'm using labview 8.2.1 & Imaq 8.2.1

Thanks a million for your help!

Waiting to hear from you...

M.Roodi

EXPLO. [email protected]

Hello Masoud chenene,

The best options that we have at the moment are to expand and then erode the according to the function of the skeleton and add them eventually open and close functions until the lack of dendrites are achieved. These dendrites are the result of the method of fictions skeleton minimize particles to a single line of pixels.

9 page 25 of the Manual of Concepts NI Vision shows the structuring element used to accomplish this minimization, resulting in dendrites.

There are also ways to subtract images, if you could isolate the dendrites and other pixels that you do not want to keep. In addition, if you can get rid of the pixels where each dendrite begins to branch from the main line, you can remove the smaller lines with a filter to particles.

Best regards

Nathan B

Technical sales engineer

National Instruments

Tags: NI Hardware

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