Saving filtered image

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Philip
Philip 2011-3-14
I have tested some code that applies homomorphic filtering to an image in the logarithmic space:
%%%%%log of image
im_l=log(1+im);
%%%%%DFT of logged image
im_f=fft2(im_l);
%%%%%Filter Applying DFT image
im_nf=H.*im_f;
%%%%Inverse DFT of filtered image
im_n=abs(ifft2(im_nf));
%%%%%Inverse log
im_e=exp(im_n);
When this process is complete, the image can be displayed using imshow(im_e,[]), but since im_e is of type double I cannot save it as per what is seen from the imshow statement...
Does anyone know how to solve this problem so that the image can be saved properly?
Many thanks!

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采纳的回答

Philip
Philip 2011-3-15
% convert image to intensities
int_vals = mat2gray(im_e);
% save intensities using imwrite
imwrite(int_vals, 'filtered_image.png');

更多回答（1 个）

Sean de Wolski
Sean de Wolski 2011-3-14
doc imwrite
  3 个评论
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Sean de Wolski
Sean de Wolski 2011-3-14
If you look at the formats in doc imwrite you'll see what the requirements are for each format. Since your images are of class double you'll either need a format that supports double or to convert you images to one of the accepted formats.
Philip
Philip 2011-3-15
Thanks, I played about for a while after your last comment and found that the easiest solution was to convert the data values to intensities using "mat2gray", and then saving the image as a PNG using "imwrite". This function converts the intensities to pixel values automatically before saving.
Thanks again!

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