It can't read an image, it says the path does not exist even though the path does exist

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ASMA MOHAMMAD 2021-6-3

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https://ww2.mathworks.cn/matlabcentral/answers/847185-it-can-t-read-an-image-it-says-the-path-does-not-exist-even-though-the-path-does-exist

评论： Walter Roberson 2021-6-8

clc
close all
clear all
imgpath{4}= 'D:\MATLAB\Finger_Knuckle_Print_Original_Database\Left_Index_Finger_165\';
fd4=fopen('loglist_Left_Index.txt','rt'); % 294 subjects Train  Total train = 493
feat1=[];
k=6;
for i=1:165
    txt1=fscanf(fd4,'%s\n',1);
    for j=1:6
       fn1=sprintf('%s/%s index/0%iROI.jpg',imgpath{4},txt1,j);   %u01000s0001_fnf1.jpg
       img1=imread(fn1);
       F=[]
       H=slbp(img1);
  F=[F;H(:)];
  P=ridgelet(img1,0);
  QQ=q(F,P);
  feat_test=[ feat_test [reshape(QQ ( :,:,1 ) ,[ ],1 )] ];
    end
end

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Steven Lord 2021-6-5

You have asked this question 1, 2, 3, and 4 times and received answers and/or comments on three of those questions.

Asking the same thing multiple times is not necessarily likely to get you different answers. It's likely to get you the same answer multiple times.

Please pick one of these questions and continue the discussion in that one question. Please don't ask this a fifth time.

John D'Errico 2021-6-5

4 identical questions on the same day. I closed one of them.

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回答（2 个）

DGM 2021-6-4

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https://ww2.mathworks.cn/matlabcentral/answers/847185-it-can-t-read-an-image-it-says-the-path-does-not-exist-even-though-the-path-does-exist#answer_716625

编辑：DGM 2021-6-4

Nobody here can guess the contents of the index file you're reading or the actual filenames on your disk. You can start by generating a short list (e.g. 2 or 3) of the filenames assembled by fn1. Then go find the full path+filename+extension for those files. Do they differ? If so, why? It helps to paste them into a text file and look at them directly next to each other. It's easy to miss little details.

I said I couldn't guess, but I'll guess anyway. If you're running windows, directory separators are \, not ./. If you want, you can build the full path expression using fullfile(), which will automatically use whichever is appropriate. EDIT: see Stephen's comment below.

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DGM 2021-6-5

Or strcmp() to enforce case-sensitivity.

Walter Roberson 2021-6-5

the code says Left_Index_Finger_165 but the error message says _left_index

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Image Analyst 2021-6-5

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https://ww2.mathworks.cn/matlabcentral/answers/847185-it-can-t-read-an-image-it-says-the-path-does-not-exist-even-though-the-path-does-exist#answer_717445

在 MATLAB Online 中打开

You did not use the fullfile() function, and so you have a forward and backward slash next to each other creating a bogus filename.

"D:\MATLAB\Finger_Knuckle_Print_Original_Database\Left_Index_Finger_165\/_left index/01ROI.jpg"

Bad Characters Here

Try this:

imgpath{4}= 'D:\MATLAB\Finger_Knuckle_Print_Original_Database\Left_Index_Finger_165';
fd4=fopen('loglist_Left_Index.txt','rt'); % 294 subjects Train  Total train = 493
feat1=[];
k=6;
for k1 = 1 : 165
	txt1=fscanf(fd4,'%s\n',1);
	for k2 = 1 : 6
		baseName = sprintf('%s index/0%iROI.jpg', txt1, k2);   %u01000s0001_fnf1.jpg
		fullFileName = fullfile(imgpath{4}, baseName)
		img1=imread(fullFileName);
		F=[]
		H=slbp(img1);
		F=[F;H(:)];
		P=ridgelet(img1,0);
		QQ=q(F,P);
		feat_test=[ feat_test [reshape(QQ ( :,:,1 ) ,[ ],1 )] ];
	end
end

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Walter Roberson 2021-6-8

在 MATLAB Online 中打开

filename = 'loglist_Left_index.txt';
[fid, message] = fopen(filename, 'wt');
if fid < 0
    error('Could not open file "%s" because "%s"', filename, message);
end
for K = 1 : 165
   fprintf(fid, '%03d_left\n', K);
end
fclose(fid);
fprint('file "%s" created.\n', filename);

After running that, you should be able to run your code.

Walter Roberson 2021-6-8

在 MATLAB Online 中打开

Your code will need the line

baseName = sprintf('%s index/%02dROI.jpg', txt1, k2);

In particular the line must not have the underscore in it, and must not have the "left" in it. The "left" and the underscore are part of the text file you are reading.

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