MATLAB Answers

imshow does not work in 2014a

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Suraj Nagaraj
Suraj Nagaraj on 26 Aug 2014
simple tif file, I try to display but Matlab 2014a throws an error and says
Undefined function 'imshow' for input arguments of type 'char'
imshow('test.tif');
that's my command that I try and I've got all the possible toolboxes installed and licensed on my machine. Any inputs will help. Its a straight rip-off from the online help section for imshow.

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Answers (6)

Image Analyst
Image Analyst on 26 Aug 2014
Poorna, run this code and tell me what you see:
% Check that user has the Image Processing Toolbox installed.
hasIPT = license('test', 'image_toolbox');
if ~hasIPT
% User does not have the toolbox installed.
message = sprintf('Sorry, but you do not seem to have the Image Processing Toolbox.');
uiwait(warndlg(message));
end

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Image Analyst
Image Analyst on 30 Jan 2015
Suraj's reply moved here since it's not an answer to the original question.
I think i have gone through the list of toolboxes installed and licensed. I have possibly got all the available toolboxes supplied by Mathworks. If I can do an imread, i must possibly be able to do an imshow.
Is there a possibility that these two simple functions will be part of two different toolboxes.
Image Analyst
Image Analyst on 30 Jan 2015
Suraj, do you still have the problem?
Note that in R2014a imread() was in base MATLAB but imshow() was not. imshow() became part of base MATLAB with the R2014b release. Have you upgraded to R2014b yet? You should not have the problem if you do.

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Mikhail
Mikhail on 26 Aug 2014
That is because you don't have Image Processing Toolbox required for imshow

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Mohammad Abouali
Mohammad Abouali on 28 Jan 2015
imshow() is also part of regular/basic MATLAB. You don't need image processing Toolbox.
Eric
Eric on 28 Jan 2015
The OP states he is using Matlab R2014a. imshow is not a part of Matlab in this version; it is in the Image Processing Toolbox. imshow was moved to Matlab with release R2014b.
Mohammad Abouali
Mohammad Abouali on 28 Jan 2015
Yes, you are right. It wasn't part of 2014a MATLAB.

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Mikhail
Mikhail on 26 Aug 2014
No! Imread doesn't require Image Processing Toolbox.
Once again: type ver in command line and check if you have Image Processing Toolbox.

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Suraj Nagaraj
Suraj Nagaraj on 27 Aug 2014
@ Image Analyst: I don't see the warning but hasIPT = 1. So that means I've got the image processing toolbox installed. I guess...???

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Eric
Eric on 28 Jan 2015
This is old, but in case anybody else is reading this thread:
The code that Image Analyst supplied for hasIPT only checks that a license is available for the Image Processing Toolbox, not that the software has been installed.
One needs to also do what Mikhail suggested: Type ver at the command line and see what is actually installed.
It is entirely possible to be licensed for a product but to not have the software installed for use.
-Eric

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Bhavna Rajasekaran
Bhavna Rajasekaran on 28 Jan 2015
I have the same problem, it seems imshow() is shifted from image processing toolbox to general matlab commands, but is apparently not installed?? I am using R2014b.. Any clues??

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Eric
Eric on 28 Jan 2015
I can confirm that inshow() does not require the Image Processing Toolbox for Matlab R2014b. I ran the following:
data = imread('moon.tif');
imshow(data)
license('inuse')
and the only license reported was Matlab.
which imshow
returns C:\Program Files\MATLAB\R2014b\toolbox\matlab\images\imshow.m. You can look to see if that file exists and if that directory is on your path.
Good luck,
Eric
John D'Errico
John D'Errico on 28 Jan 2015
As Eric says, imshow is now in MATLAB, since I lack the IPT, but I do have imshow.
Eric
Eric on 28 Jan 2015
imshow appeared in Matlab with Release R2014b. This is mentioned in the release notes.

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Muhammad Zaigham Zaheer
Muhammad Zaigham Zaheer on 14 May 2015
Edited: Muhammad Zaigham Zaheer on 14 May 2015
I am also having this same problem in 2014b. This code below works fine when I remove the imshow command. But gives error when I imshow command is included.
[imgs labels] = readMNIST('t10k-images-idx3-ubyte', 't10k-labels-idx1-ubyte', 50, 10);
for i=1:50
im=imgs(:,:,i);
name = ['image',num2str(i),'.jpeg'];
imwrite (im,['image',num2str(i),'.jpeg']);
end
imshow(im);

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Image Analyst
Image Analyst on 14 May 2015
You forgot to include your error. And did you try the code I posted above. Also try
which -all imshow
ver
and tell us what it says
Muhammad Zaigham Zaheer
Muhammad Zaigham Zaheer on 20 May 2015
Thanks for the reply. But it was may be some corrupted file problem. I have re-installed matlab and everything is working fine now.

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