triangle detection in image

[kaus]

Hi. i need help on making a vi for detecting triangles in an image. IMAQ Detect shapes has no provision for triangle but for circle, ellipse an d rectangle. Please help. Anyone developed this can elp me please.

[P@Anand]

Try pattern matching available with the Vision development module.

[kaus]

Anand,

I dont have to pattern match  cuz pattern match you need to feed another image for pattern detectiion. I need that within a single image i should detect circle,triangle and rectangle. I am successful for cirle and rectangle cuz of IMAQ Detect shapes , but have no idea how to do for triangle.

[muks]

Do you want the red overlay you mentioned in the output image to be a triangle or is rectangle overlay ok? We can do both and thanks for starting a new thread

[muks]

Kaus please try this

[muks]

---

Anand,

I dont have to pattern match cuz pattern match you need to feed another image for pattern detectiion. I need that within a single image i should detect circle,triangle and rectangle. I am successful for cirle and rectangle cuz of IMAQ Detect shapes , but have no idea how to do for triangle.

---

If want you can use pattern matching. You can use more than one template if required.

[kaus]

@muks: thanks gor sharing. yeah if we want we can develop the triangular overlay through hough lines and can start as a new thread.

[muks]

---

@kaus wrote:

@muks: thanks gor sharing. yeah if we want we can develop the triangular overlay through hough lines and can start as a new thread.

---

Kaus,

Creating triangular overlay through lines will a bit tricky. The triangle you posted are all same so you might be able to do it but for a rotated and scalene triangle the overlay will be difficult one.

You can continue in the same thread if your overlay part needs some modidication. This is afterall your thread

[kaus]

thanks yeah. But this vi has a short coming. If i attach rectanglar shapes, it is detecting them too which it shouldnt. I am in need of a pure, only trianlge detector. 

[muks]

Then i require a image that has all the shapes in the same image