MATLAB Answers

problem facing in imwrite syntax

2 views (last 30 days)
rohan
rohan on 27 Apr 2014
Commented: Image Analyst on 4 May 2014
if true
folder='C:\Users\Public\Videos\Sample Videos\pro\Ne';
for k = 2 : 10
% Get the base file name.
baseFileName = sprintf('img%d.jpg', k);
% Combine it with the folder to get the full filename.
fullFileName = fullfile(folder, baseFileName);
% Read the image file into an array.
imageArray = imread(fullFileName);
a=imageArray;
figure(1);
imshow(a);
title('color image');
c=rgb2gray(a);
b=imresize(c, [512 512]);
figure(2);
imshow(b);
title('original gray scale image');
n=512;
k=1;
for i=1:1:n
for j=1:2:n
if (j<=n-1)
s(i,k)=(b(i,j)+b(i,j+1))/2;
d(i,k)=b(i,j)-b(i,j+1);
end
k=k+1;
end
k=1;
end
for i=1:1:n
for j=1:1:n/2
b(i,j)=s(i,j);
b(i,j+n/2)=d(i,j);
end
end
for j=1:1:n/2
for i=1:2:n
if i<=n-1
s(k,j)=(b(i,j)+b(i+1,j))/2;
d(k,j)=b(i,j)-b(i+1,j);
end
k=k+1;
end
k=1;
end
for i=1:1:n/2
for j=1:1:n/2
b(i,j)=s(i,j);
b(i+n/2,j)=d(i,j);
end
end
figure(3);
imshow(b);
title('image after one level of compression')
for i=1:1:n/2
for j=1:2:n/2
if (j<=n/2-1)
s(i,k)=(b(i,j)+b(i,j+1))/2;
d(i,k)=b(i,j)-b(i,j+1);
end
k=k+1;
end
k=1;
end
for i=1:1:n/2
for j=1:1:n/4
b(i,j)=s(i,j);
b(i,j+n/4)=d(i,j);
end
end
for j=1:1:n/4
for i=1:2:n/2
if i<=n/2-1
s(k,j)=(b(i,j)+b(i+1,j))/2;
d(k,j)=b(i,j)-b(i+1,j);
end
k=k+1;
end
k=1;
end
for i=1:1:n/4
for j=1:1:n/4
b(i,j)=s(i,j);
b(i+n/4,j)=d(i,j);
end
end
figure(4);
imshow(b);
title('image after two level of compression')
for i=1:1:n/4
for j=1:2:n/4
if (j<=n/4-1)
s(i,k)=(b(i,j)+b(i,j+1))/2;
d(i,k)=b(i,j)-b(i,j+1);
end
k=k+1;
end
k=1;
end
for i=1:1:n/4
for j=1:1:n/8
b(i,j)=s(i,j);
b(i,j+n/8)=d(i,j);
end
end
for j=1:1:n/8
for i=1:2:n/4
if i<=n/4-1
s(k,j)=(b(i,j)+b(i+1,j)/2);
d(k,j)=b(i,j)-b(i+1,j);
end
k=k+1;
end
k=1;
end
for i=1:1:n/8
for j=1:1:n/8
b (i, j)=s(i,j);
b (i+n/8, j)=d(i,j);
end
end
b=imcrop(b,[0 0 64 64]);
figure (5);
imshow(b);
title('image after third level of compression')
b=imresize(b, [3456 4608]);
imshow(b);
imwrite(b,'C:\Users\Public\Videos\Sample Videos\pro\Newr\im%d.jpg',k);
end
end
  3 Comments
rohan
rohan on 27 Apr 2014
if true
% folder='C:\Users\Public\Videos\Sample Videos\pro\Ne';
for k = 2 : 10
% Get the base file name.
baseFileName = sprintf('img%d.jpg', k);
% Combine it with the folder to get the full filename.
fullFileName = fullfile(folder, baseFileName);
% Read the image file into an array.
imageArray = imread(fullFileName);
a=imageArray;
figure(1);
imshow(a);
title('color image');
c=rgb2gray(a);
b=imresize(c, [512 512]);
figure(2);
imshow(b);
title('original gray scale image');
n=512;
k=1;
for i=1:1:n
for j=1:2:n
if (j<=n-1)
s(i,k)=(b(i,j)+b(i,j+1))/2;
d(i,k)=b(i,j)-b(i,j+1);
end
k=k+1;
end
k=1;
end
for i=1:1:n
for j=1:1:n/2
b(i,j)=s(i,j);
b(i,j+n/2)=d(i,j);
end
end
for j=1:1:n/2
for i=1:2:n
if i<=n-1
s(k,j)=(b(i,j)+b(i+1,j))/2;
d(k,j)=b(i,j)-b(i+1,j);
end
k=k+1;
end
k=1;
end
for i=1:1:n/2
for j=1:1:n/2
b(i,j)=s(i,j);
b(i+n/2,j)=d(i,j);
end
end
figure(3);
imshow(b);
title('image after one level of compression')
for i=1:1:n/2
for j=1:2:n/2
if (j<=n/2-1)
s(i,k)=(b(i,j)+b(i,j+1))/2;
d(i,k)=b(i,j)-b(i,j+1);
end
k=k+1;
end
k=1;
end
for i=1:1:n/2
for j=1:1:n/4
b(i,j)=s(i,j);
b(i,j+n/4)=d(i,j);
end
end
for j=1:1:n/4
for i=1:2:n/2
if i<=n/2-1
s(k,j)=(b(i,j)+b(i+1,j))/2;
d(k,j)=b(i,j)-b(i+1,j);
end
k=k+1;
end
k=1;
end
for i=1:1:n/4
for j=1:1:n/4
b(i,j)=s(i,j);
b(i+n/4,j)=d(i,j);
end
end
figure(4);
imshow(b);
title('image after two level of compression')
for i=1:1:n/4
for j=1:2:n/4
if (j<=n/4-1)
s(i,k)=(b(i,j)+b(i,j+1))/2;
d(i,k)=b(i,j)-b(i,j+1);
end
k=k+1;
end
k=1;
end
for i=1:1:n/4
for j=1:1:n/8
b(i,j)=s(i,j);
b(i,j+n/8)=d(i,j);
end
end
for j=1:1:n/8
for i=1:2:n/4
if i<=n/4-1
s(k,j)=(b(i,j)+b(i+1,j)/2);
d(k,j)=b(i,j)-b(i+1,j);
end
k=k+1;
end
k=1;
end
for i=1:1:n/8
for j=1:1:n/8
b (i, j)=s(i,j);
b (i+n/8, j)=d(i,j);
end
end
b=imcrop(b,[0 0 64 64]);
figure (5);
imshow(b);
title('image after third level of compression')
b=imresize(b, [3456 4608]);
imshow(b);
imwrite(b,'C:\Users\Public\Videos\Sample Videos\pro\Newr\im%d.jpg',k);
end
end

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Accepted Answer

Roberto
Roberto on 27 Apr 2014
Edited: Roberto on 27 Apr 2014
i think it migth have to do with the %d in the string
try using a prearranged string
format = 'jpg';
str = ['C:\Users\Public\Videos\Sample Videos\pro\Newr\im' num2str(someVar) '.jpg'] ;
imwrite(b,str,format) ;
or use a uiputfile function
  3 Comments
rohan
rohan on 4 May 2014
sir, can u edit my code and then send me..i tried sme ways bt still unsucessful

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More Answers (1)

Image Analyst
Image Analyst on 4 May 2014
rohan, you can't do this:
imwrite(b,'C:\Users\Public\Videos\Sample Videos\pro\Newr\im%d.jpg',k);
imwrite is not like sprintf. You hav eto do it in two different steps:
filename = sprintf('C:\Users\Public\Videos\Sample Videos\pro\Newr\im%d.jpg',k);
imwrite(b,filename);
as I already showed you a few days ago here: http://www.mathworks.com/matlabcentral/answers/126979#comment_210616 You never answered that so I guess you didn't go back and check or you just ignored it.
  2 Comments
Image Analyst
Image Analyst on 4 May 2014
Since I don't have 901 images, I can offer just a few suggestions.
  1. Please indent your code. Type control-a, then control-i to properly indent it.
  2. ADD COMMENTS. No one can follow this alphabet soup of code without help.
  3. The format input argument in imwrite is not needed - it figures it out automatically from the filename.
  4. Use descriptive variable names to make it easier to follow. Names like row, column, originalImage, compressedImage, etc., not single letter variables like i,j,b,s,d,k, n, c, and a. I don't even want to attempt to remember what all those mean.
After you put in those fixes, if you want me to look at your improved code, I can do that.

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