Adjust ROI to min/max black edges

[A.Salcedo]

Hello to all.

First of all thanks a lot for reading this post and being able to help.

I would like the next:

1- I have an image, for example this:

2- User has to draw a ROI to check the logo:

My program has already done this.

But now I want the program to adjust the User ROI automatically to min/max black edges like this (red bounding rect):

So how can adjust the User ROI to min/max black adges detected?

Thanks a lot.

[udka]

You didn't provide full information on how the user ROI has been chosen.
-How you get the detected ROI?
-It should simple with converting the Bounding box rectangle using Rectangle to ROI.
-then you can replace the User ROI with the ROI obtained, you can do overlay or replace the ROI value using Property node of the Image Indicator.

[A.Salcedo]

Hello, thanks for replying.

Sorry for bad explanation.

I detect User Roi with property node of the Image Indicator.

So I would liket to do the next:

1-User draws a ROI (I get this ROI with property node of the Image Indicator) 

2-Inside that ROI program has to detect the min/max black edges(vertically and horizontally).

3-Then replace programatically the ROI that user drew (green ROI in post1) for a new ROI (red ROI in post 1).

So my problem is how to detect the min/max black edges that there is inside user ROI (green ROI) in image.

Do I explain??

Thanks a lot!

[udka · Accepted solution]

IMAQ Horizontal Max Clamp and Vertical Clamp.
-The other way is threshold and get particle measurements(Bounding Box of the Particle should be enough): https://zone.ni.com/reference/en-XX/help/370281AC-01/nivisionconcepts/particle_measurements/

[A.Salcedo]

Thanks a lot.

It seems really interesting "partycle measurements" and its bounding box particle.

What is the name of the VI which get that bounding box particle (particle inside a ROI that user draws) ?

I check this as well: http://zone.ni.com/reference/en-XX/help/370281P-01/imaqvision/imaq_find_edge/

Thanks again

[udka]

IMAQ Particle Analysis VI is the one which i am referring to and remember that it works on Binary image only.
-You can use IMAQ Rake 3 to get Horizontal and Vertical Scan Direction and First and last Edge Combination.
-I think you might need to use combination if you want get in this method by getting the straight edge detection technique.

[A.Salcedo]

Hello!

Finally I have used max hor/ver clamp.vi.

Those VI work really good for what I wanted to do. I have followed the next steps:

1-Select a ROI User.

2-Get max horizontal/vertical black points inside the ROI User

3-Create a rectangle with those points

Thanks a lot.