matlab - How do I save an image generated by imshow(image) into a variable? -


this code. want save image displayed on imshow(img) variable use later. thanks! 

img=imread('image1.bmp'); figure(1), imshow(img);  [r c]=ginput(4); bw=roipoly(img,r,c); % figure,imshow(bw)    [r c]=size(bw);  i=1:r     j=1:c         if bw(i,j)==1             img(i,j)=img(i,j);         else             img(i,j)=0;         end     end end figure, imshow(img); title ('output image');

you can use classic getframe / cdata idiom. figure window open, this:

figure; imshow(img); title('output image'); h = getframe; im = h.cdata;

h handle current frame open, , cdata field contains image data frame. above code stores frame image data variable called im use later.

minor comment

that for loop code set output bit inefficient. can vectorized , you'll notice significant speedups.

this code:

for i=1:r     j=1:c         if bw(i,j)==1             img(i,j)=img(i,j);         else             img(i,j)=0;         end     end end

... can replaced with:

img(~bw) = 0;

i don't understand why you'd need store image data inside frame of imshow... when img contains data , showing data contained in img. why can't use img directly application? nevertheless, above solution work.


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