Re: Finding area of a triangle shape within a complex image of a single color

Posted by nicola giacobbe on Jul 22, 2013; 7:07am
URL: http://imagej.273.s1.nabble.com/Finding-area-of-a-triangle-shape-within-a-complex-image-of-a-single-color-tp5004059p5004067.html

There are many solutions: I cannot guide you to solve it completely into  
imagej as I am not proficient on it as I would like but I could give you a  
couple hints:

1) a corner detector could find all corner on the image, it is then up to  
you to find the ones that fit the triangle you are looking for
2) a sophisticated pattern matching could find it (for an example look up  
TLD on Google)
3) other solutions depend on the specific image being analyzed (i.e. if  
the strand of the triangle were always much smaller of the triangle body  
you could ERODE the whole image, or better yet, only the colour plane  
coincident with the triangle colour, to remove the strand and then use a  
connected component labeller to recover the triangle)

Sincerely yours
  nicola giacobbe

On Sat, 20 Jul 2013 21:58:31 +0200, Burinok <[hidden email]>  
wrote:

> Hello All,
>    I have been searching for a way to find the area of a piece of an  
> object
> in imageJ. Unfortunately, there is no contrast difference to be used. I
> attach an example that I drew up in powerpoint here. The goal would be to
> find the area of the triangle on the left. I have not come across any
> solutions that could do it if the object was all of a single color. Does
> anyone have any suggestions?
> Thanks,
> Tony
>
> <http://imagej.1557.x6.nabble.com/file/n5004059/testimage.png>
>
>
>
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