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How do I find the area of a shaded region in an image?

  • 04-08-2005 1:15pm
    #1
    Zaph0d
    Closed Accounts Posts: 756 ✭✭✭


    Hi
    I have a number of images that I want to process. For each image I want to highlight several regions (polygons) and then quickly calculate the area of these regions.
    Does anyone know a tool or a method that can do this? I had a look at how to calculate a polygon's area but this looks like overkill. Maybe something like: I use a colour for the highlight that is not used elsewhere in the image and then count the number of pixels lit in that colour.
    Or maybe there is a graphics program that offers this function.

    Anyone know?

    Thanks


Comments

  • #2
    Mary-Ellen
    Registered Users, Registered Users 2 Posts: 228 ✭✭Mary-Ellen


    Hi,

    If you have the coordinates of all points and there isn't too many (cause they'd all have to be entered manually), you could use a program to calculate it.

    There's one in C and in Java on this link:

    http://astronomy.swin.edu.au/~pbourke/geometry/polyarea/

    Applications like mathlab and maple would do it too and you'd probably get ready made code if you googled it. You'd need coordinates for them too.

    Hope that helps.


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