why won't imshow display an image?

2 次查看（过去 30 天）
N/A
N/A 2015-9-13
评论： Image Analyst 2015-9-13
In following a demonstration I typed
>> I=imread('pout.tif');
>> imshow(I)
To which MATLAB (my version is R2014a) responded:
Attempt to call constructor image with incorrect letter case.
Error in basicImageDisplay (line 24)
hh = image(cdata, ...
Error in imshow (line 266)
hh = basicImageDisplay(fig_handle,ax_handle,...
I have tried nothing and it still won't work! Does anyone know how I can appease MATLAB?

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回答（1 个）

Image Analyst
Image Analyst 2015-9-13
Run this code:
% 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.\nDo you want to try to continue anyway?');
reply = questdlg(message, 'Toolbox missing', 'Yes', 'No', 'Yes');
if strcmpi(reply, 'No')
% User said No, so exit.
return;
end
end
See if it tells you that you don't have the Image Processing Toolbox. I believe imshow() wasn't added to base MATLAB until after the version you have.
  2 个评论
N/A
N/A 2015-9-13
Ok I ran that code (in the editor) to which MATLAB returns:
>> ihmo %which is what I named it
Warning: Function image has the same name as a MATLAB builtin. We suggest you rename the function to avoid a potential name conflict.
Ok... I may have done something wrong there, but I still found the concept of me-not-having-the-toolbox a logical explanation. So I've downloaded a trial version of the toolbox and set the path name so MATLAB could find it. Yet it still can't successfully execute my earlier code.
Furthermore, just as a test, before I got the new toolbox I asked MATLAB >>help imshow
and it did indeed give an extensive description of the function leading me to believe it recognizes imshow as an old friend.
...then again I am quite the beginner and so I'm starting to suspect I have overlooked something more
Image Analyst
Image Analyst 2015-9-13
Yes you did something wrong. My code does not even call the function "image()". Anyway, that is just a warning and the code should still run, or produce an actual error message.
What does this say:
>> which -all image
You may have your own function called image.m. If you do, you should rename it because it's trying to use that instead of the built-in function.
Otherwise, you should call technical support. They are always willing to help you get a trial toolbox to work.

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