How can I define a matlab code for the size of structuring elemtent depends on image size?

% here a sample matlab code
SE = strel('disk', R);% I would like to set R depend on image size %Please give me a sample matlab code

Answer 1

[Walter Roberson]

sz = min(size(I,1), size(I,2));    %where I is the image
filt_imgs = cell(sz,1);
for R = 1 : sz
  SE = strel('disk', R);
  filt_imgs{R} = imopen(I, SE);
end

[kyawt kyawt]

Thanks for your answer ...!

[kyawt kyawt]

Please suggest me...! which size of image is suitable for this code. When I used size of image 800*600 my program take long time to run this code. ... clear all clc [filename, pathname] = uigetfile({'*.*'},'Browse'); name=[pathname,filename]; rgb = imread(name); I = rgb2gray(rgb); hy = fspecial('sobel'); hx = hy'; Iy = imfilter(double(I), hy, 'replicate'); Ix = imfilter(double(I), hx, 'replicate'); gradmag = sqrt(Ix.^2 + Iy.^2); %Mark the Foreground Objects

sz = min(size(I,1), size(I,2)); %where I is the image filt_imgs = cell(sz,1); for R = 1 : sz se = strel('disk', R); filt_imgs{R} = imopen(I, se); end

Ie = imerode(I, se); Iobr = imreconstruct(Ie, I); Ioc = imclose(Io, se); Iobrd = imdilate(Iobr, se); Iobrcbr = imreconstruct(imcomplement(Iobrd), imcomplement(Iobr)); Iobrcbr = imcomplement(Iobrcbr); fgm = imregionalmax(Iobrcbr); I2 = I; I2(fgm) = 255; %clean the edges of the marker blobs se2 = strel(ones(5,5)); fgm2 = imclose(fgm, se2); fgm3 = imerode(fgm2, se2); fgm4 = bwareaopen(fgm3,10); %shink them a bit e.g 20 I3 = I; I3(fgm4) = 255; %Compute Background Markers bw = im2bw(Iobrcbr, graythresh(Iobrcbr)); D = bwdist(bw); DL = watershed(D); bgm = DL == 0; %Compute the Watershed Transform of the Segmentation Function gradmag2 = imimposemin(gradmag, bgm | fgm4); L = watershed(gradmag2); . . .