Best Elliptical Fit for irregular shape

Hi;

I am trying to find the best elliptical fit for irregular shapes in a matrix, say my matrix is defined as:

    0 0 0 0 0 0 0 0 0 0 0;
    0 0 1 1 1 0 0 0 0 0 0;
    0 0 0 1 1 1 1 0 0 0 0;
    0 0 0 0 1 1 1 0 0 0 0;
    0 0 0 0 0 1 1 1 0 0 0;
    0 0 0 0 0 0 0 0 0 0 0;

how can I get the best ellipse fit for this block of ones in the middle of the image? A reference document is much appreciated.

thanks

Answer 1

[Matt J]

 regionprops(Image,'MajorAxisLength', 'MinorAxisLength', 'Centroid', 'Orientation')

[Kazekage Sama]

thank you, I know about this function, but I need to know the details of the steps to get the ellipse so that I can write my own code.

[Image Analyst]

Write your own code to do what ? To do what regionprops does? To draw an ellipse in the overlay using information given to you by regionprops?

[Kazekage Sama]

Yes...basically I need the logic to be test in MATLAB first then implement it using VHDL. That's why I care about the details of the code.

I heard that I need to find the centre of gravity and things like this, but I don't know what they basically are and how to get them correct.

[Image Analyst]

You know how to find the center of gravity - it's just (in pseudocode)

cogX = sum(x*yourimage)/sum(yourImage)

That gets you the center of gravity in the x direction. That code won't work as is but see if you can translate it into code that does work.