Unable to open file "binaryeye.jpg" for writing. You may not have write permission.

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Jia Zhen
Jia Zhen 2014-11-17
回答： Tushant Verma 2021-10-21
Hi, i am trying to run this program but i keep getting this error "Unable to open file "binaryeye.jpg" for writing. You may not have write permission. "
The code which i am trying is:
im=imread('2.jpg');
imgray=rgb2gray(im);
imgray=double(imgray);
[imgx,imgy]=gradient(imgray);
imggra=sqrt(imgx.^2+imgy.^2);
imedge=uint8(imggra);
imedge=imadjust(imedge);
imedge=im2bw(imedge);
imwrite(imedge,'binaryeye.jpg');
[imr,imc]=size(imgray);
maxvalue=eps;
maxr=0;
maxx=1;
maxy=1;
for radius=9:13
for i=radius+1:imr-radius
for j=radius+1:imc-radius
maxcount=0;
for theta=0:pi/60:2*pi
y=floor(radius*sin(theta))+i;
x=floor(radius*cos(theta))+j;
if imedge(y,x)==true
maxcount=maxcount+1;
end
% y=floor((radius-1)*sin(theta))+i;
% x=floor((radius-1)*cos(theta))+j;
% if imedge(y,x)==true
% maxcount=maxcount+1;
% end
if maxcount>maxvalue
maxvalue=maxcount;
maxr=radius;
maxx=j;
maxy=i;
end
end
end
end
end
maxr,maxx,maxy
imgray=uint8(imgray);
figure,imshow(imgray)
hold on;
for theta=0:pi/50:2*pi
x=floor(maxr*cos(theta))+maxx;
y=floor(maxr*sin(theta))+maxy;
plot(x,y,'b*-');
end
However i keep getting this error
Error using imwrite (line 455)
Unable to open file "binaryeye.jpg" for writing. You may not have write
permission.
what can i do to solve it? i already change the setting of the folder containing binaryeye.jpg to be written.
Thanks.
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采纳的回答

Geoff Hayes
Geoff Hayes 2014-11-17
Jia - are you sure that you have given the write permission to the correct folder where the image should be written to? Perhaps you should explicitly define the path to the folder as
folder = '/Users/jia/someFolder';
imwrite(imedge,fullfile(folder,'binaryeye.jpg'));
If that doesn't work, then check to see if the file already exists in this folder. Perhaps you don't have permission to overwrite it.

更多回答（2 个）

Mridul Pandey
Mridul Pandey 2017-11-18
change present working directory to the desired directory where you want to save the file either change in on the command window or script. like.. cd c:\folder\folder\... and then use imsave(...) function.
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Image Analyst
Image Analyst 2018-12-13
No way! NOT a bug in MATLAB.
How can you say that bad programming practice by a novice user is a bug in MATLAB???
Geoff gave the proper way - using fullfile(). Just because you can do it by using cd() (like a novice) and not using fullfile() (like an expert would) does not mean that that is a bug in MATLAB.
It's not a bug - it's a feature.bmp
Walter Roberson
Walter Roberson 2018-12-13
Mathworks recommends not using cd unless necessary. Every time you cd, Mathworks has to recheck the path resolution for functions, just in case you happened to cd to a directory that had a function whose name was the same as a function already being called.

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Tushant Verma
Tushant Verma 2021-10-21
Well, I also faced the same issue, so what i did was I just changed the directory to which i am writing my file to,and then the code worked as desired. I would recommend you to write in some folder of drive other then the one where MATLAB is installed.
Hope this will help.

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