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How to code this in matlab

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Poonam
Poonam el 26 de Mzo. de 2013
Given-Seed which is selected as initial seed is centre pixel of an RGB image
For grow formula we use intensity based similarity between seed and 8 neighbour pixels of the seed
The similarity index between two neighbourhood pixels of RGB intensities (x,y) and (x+i,y+j)is given by
Dist=sqrt(Dr+Dg+Db);
where
Dr=((f(x+i,y+j,1)-f(x,y,1))^2
Dg=((f(x+i,y+j,2)-f(x,y,2))^2
Db=((f(x+i,y+j,3)-f(x,y,3))^2
  2 comentarios
Sean de Wolski
Sean de Wolski el 26 de Mzo. de 2013
What have you done so far?
Poonam
Poonam el 26 de Mzo. de 2013
This is what i have done for HSV image
function d=dist(f,seed,cp8)
r=rgb2hsv(f);
[m,n]=size(r);
seed=[m/2,n/2];
Dh=(r(x+i,y+j,1)-r(x,y,1)).^2;
Ds=(r(x+i,y+j,2)-r(x,y,2)).^2;
Dv=(r(x+i,y+j,3)-r(x,y,3)).^2;
d=sqrt(Dh+Ds+Dv);

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Respuestas (1)

Image Analyst
Image Analyst el 26 de Mzo. de 2013
Calculate delta E as in my demo http://www.mathworks.com/matlabcentral/fileexchange/31118-color-segmentation-by-delta-e-color-difference. Basically that's the color difference.
Does the value of the seed change from pixel to pixel (difficult), or is it always going to be the color that you selected as the first seed point (very easy)?
  2 comentarios
Poonam
Poonam el 26 de Mzo. de 2013
seed point is going to be always the color which was selected as first seed point
Image Analyst
Image Analyst el 26 de Mzo. de 2013
Then my delta E app is exactly what you want. Download it and run it. If you want, you can replace imfreehand() with ginput(1) so that you pick a single pixel rather than outlining a region.

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