I have some questions. I try to follow some coding from Mathworks:
I = imread('cameraman.tif');
ssimValues = zeros(1,10);
qualityFactor = 10:10:100;
for i = 1:10
imwrite(I,'compressedImage.jpg','jpg','quality',qualityFactor(i));
ssimValues(i) = ssim(imread('compressedImage.jpg'),I);
end
I just change the image file which is a.jpg and b.jpg but I get this error from MATLAB:
Undefined function 'ssim' for input arguments of type 'uint8'
Error in SSIMTesting (line 6)
ssimValues(i) = ssim(imread('logohalal1.jpg'),i);
Why is that ? Can someone help me explain the code and the error ? Sorry because I'm new in MATLAB.
Thank you.
MATLAB release notes for the Image Processing Toolbox shows that this function was new to R2014a. If you have an older version of MATLAB, or you don't have that toolbox, you don't have it. This sort of issue can be avoided by using only examples found in the help on your local installation of MATLAB rather than the online help.
To check your version of MATLAB and installed toolboxes, type ver at the command line.
To check if a function can be found on your MATLAB path, you can use which, e.g. which ssim
Related
i'm trying to use getpts to choose points in the current figure using the mouse. However, when i run it, i'm getting the error "unrecognized function or variable 'getpts'."
Here's my code
for i=1:n
im = imread([read_path 'IMG_' num2str(i+t) '.jpg']); %Get image
figure
imshow(im)
[x,y] = getpts; %returns error
end
Any idea why that's happening?
Note: I'm using the free trial version of Matlab
I'd appreciate the help!
From the docs, getpts is in the image processing toolbox.
This isn't always obvious, you can infer it from the docs link itself:
mathworks.com/help/images/ref/getpts.html
(where a built-in would be something like mathworks.com/help/matlab/ref/sum.html)
You can also see it's nested under the image processing toolbox in the side-bar on that page.
In your trial installation of MATLAB you likely don't have this toolbox. You might know from the install process, or you could check whether the toolbox folder exists in the installation directory, e.g.
I'm trying to use roipoly(I) to allow user selection of a region within an image. When I run the example code from MATLAB documentation:
img = imread('eight.tif')
imshow(img)
bw = roipoly(img)
I'm getting the following error:
Undefined function or variable 'iptPointerManager'.
with several other error lines after, but i'm quite convinced that the one above is the issue.
I have MATLAB R2016a on Windows 7 with image processing toolbox installed and working.
Resetting the path using restoredefaultpath worked.
I want to use fig2texPS to export plots from MATLAB to LaTeX. I copied the the script to D:\Eigene Dokumente\MATLAB\fig2TexPS and added this folder as a path in MATLAB. Unfortunately, I receive the following error:
>> fig2texPS()
Undefined function 'find' for input arguments of type 'matlab.graphics.chart.primitive.Line'.
Error in fig2texPS (line 526)
lsh = double(find(handle(lshandles),'-class','graph2d.lineseries')); % find plots
PS: I use a version of the script which was updated in order to work with pdtlatex (http://pastebin.com/xK6KxxBT) that I found in the MATLAB Central File Exchange. The same error also occurs when I use the original script.
This might not be the answer you are looking for, but there is the marvelous matlab2tikz that does the job of conversion of figures quite nicely, which you could use as an alternative to fig2texPS.
I also use the function fig2texPS.m and it works very well. It might be an answer for your question to use an older version of Matlab. I am using 2013b and it works. While I have tried this function with Matlab 2015a, I was getting the same error message.
I hope my answer helps you with your problems.
I am using Matlab R2010a on Windows 7 64 bit.
When I was using imfindcircles, I got the error.
>> [centers, radii] = imfindcircles(image,[100 400],'ObjectPolarity','dark')
??? Undefined function or method 'imfindcircles' for input arguments of type
'uint8'.
I referenced a helpful question and found out that I cannot find imfindcircles function.
>> which imfindcircles
'imfindcircles' not found.
>> help imfindcircles
imfindcircles not found.
Use the Help browser Search tab to search the documentation, or
type "help help" for help command options, such as help for methods.
I cannot find imfindcircles.m on my computer.
EDIT:
I checked the functions in the MATLAB Image Processing Toolbox, and found imread.
>> which imread
C:\Program Files\MATLAB\R2010a\toolbox\matlab\imagesci\imread.m
I found some function in C:\Program Files\MATLAB\R2010a\toolbox\matlab\imagesci and C:\Program Files\MATLAB\R2010a\toolbox\images, but I don't have imfindcircles.m. Should I download imfindcircles.m somewhere and put it into an directory?
You need to have toolbox ver. 8.0 or greater to find imfindcircles. use "ver" to find the installed version for image processing toolbox
imfindcircles is part of the Image Processing toolbox.
You need to have this toolbox and to have a valid license for it.
Did you check if you have any of the other functions in this toolbox?
Using the adftest function in MATLAB's econometrics toolbox, I'm receiving the following error:
>> [h1,pVal1] = adftest(y1,'model','ARD')
Error using lagmatrix (line 25)
lagmatrix: wrong # of input arguments
Error in adftest>runReg (line 705)
yLags = lagmatrix(y,0:(testLags+1));
Error in adftest (line 417)
testReg = runReg(i,y,testT,testLags,testModel,needRegOut);
y1 is a <41x1> vector of doubles.
Has anyone received this error or have any thoughts on what the issue is? I am using this code right out of the box so I'm not sure what is going on. I'd post to MATLAB's site, but it is down for maintenance.
This is either a bug in Matlab, in which case you should submit it on the Matlab support site. Before you do that, you should check that you don't have a function lagmatrix on your path that shadows the built-in function. Type
which lagmatrix
on the command line. If the path does not point to your Matlab installation, you should move lagmatrix off the Matlab search path.
Also note that y1 should not contain all NaN, or be otherwise degenerate, so you may want to check the function using the sample data as suggested in the help to be sure it's a bug and not just your data.
I had the same problem with this function. In my case, the problem was the function lagmatrix (older version) in my MATLAB path and the adftest function was the newest version. The soluction was delete the older version of lagmatrix.