problem with strel function

Hi

I want to apply 'disk' structure on my balck and white image, however it rises an error as followe:

Undefined function or variable 'MakeDiskStrel'.

Error in main (line 25)

se =MakeDiskStrel();

my code:

I = imread('img.jpg');
gray = rgb2gray(I);
bw1 = imbinarize(gray);
bw2 = imfill(bw1,'holes');
se = strel('disk',10);
cl=imclose(bw2,se);
imshow(cl)

I am using MATLAB R2018b

[Jon]

I don't see the line of code

se =MakeDiskStrel()

in the listing that you provided.

Without seeing the part of the code that is throwing the error it is difficult to give further guidance

[fatemeh n]

I havn't written such a line as

se =MakeDiskStrel()

It raise this error with above codes only.

I have attached the screenshot of the erro.

[Jon]

I'm sorry, I don't currently have an active license for the image processing toolbox, so I guess you will have to find someone who does to help you further

[Walter Roberson]

MakeDiskStrel is a function defined at line 1028 of strel.m

[fatemeh n]

I tried changing the radius and it is working with 1 and 2 but not any larger number, can anyone explain why it is the case?

this is part of a tiny project for university and in the project description, it is specifically mentioned to set the radius to 10. Any suggestion what should I do? radius 10 raise error.

[Walter Roberson]

If you edit strel then what do you see at line 1028?

[fatemeh n]

I never changed anything in strel built-in function codes. So everything is the same. hope I understood your question well?

[Walter Roberson]

Could you confirm that the same strel that you are executing that is complaining about MakeDiskStrel not existing, does in fact define a function MakeDiskStrel at line 1028?

If so then about the only way you could get that happening is if strel.m is corrupted at some point after the line that calls MakeDiskStrel so that MATLAB is unable to parse the rest of the file properly. If that is the case then if you edit strel you would very likely see a big red error mark at the point where MATLAB gives up parsing.

[Jon]

I noticed that in the OP original post the error message is listed as

Undefined function or variable 'MakeDiskStrel'.

Error in main (line 25)

se =MakeDiskStrel();

Note that in the last line of the error message, there is no space between the equal sign and the function MakeDiskStrel();

Usually all of the official MATLAB code would have a space there, e.g.

se = MakeDiskStrel()

This makes me wonder if someone has been editing the original MATLAB source and perhaps breaking something in the process

[Walter Roberson]

Interesting point, Jon. Indeed, the original code, line 211 in R2018b, is

                        se = MakeDiskStrel(params{:});

Notice that a parameter has been passed, but the code with the error message, no parameter was passed.

Therefore the user is not using the Mathworks strel.m

I wonder what the output is of

which -all strel

[fatemeh n]

I went through strel.m hopefully the space was there. However, I am considering reinstalling the software maybe something else is broken here. Thanks for your time.

[Walter Roberson]

what shows up for

 which -all strel

It looks like you are activating a different file.