autosave a image of figure

this is my code

s1 = serial('COM3');
fopen(s1)
fprintf(s1, '*IDN?');
idn = fscanf(s1);
fclose(s1);
if idn == 'a'
  vid = videoinput('winvideo',1);
  src = getselectedsource(vid);
  vid.FramesPerTrigger = 1;
  preview(vid);
  vid.ReturnedColorspace = 'rgb';
  im1=getsnapshot(vid);
  preview(vid);
  closepreview(vid);
  stop(vid);
  e=imshow(im1);
else
  f = errordlg('The phone was not used', 'Recorded status');
end
imwrite(im1, fullFileName);
grayImage = rgb2gray(im1);
meanGL = meann2(grayImage);
if meanGL < 20 % or whatever.
  warningMessage = sprintf('Something is wrong.\nThe image is too dark.\nThe
  mean intensity is only %.1f gray levels', meanGL);
  uiwait(warndlg(warningMessage));
end
inwrite(im1,fullFileName) ;

this is my code ..but it give an error in the line of

and in line of meann2(grayimage)

the error is

Undefined function 'meann2' for input arguments of type 'uint8'.

Error in InProcessing (line 21)

meanGL = meann2(grayImage);

------------------------------------------

Warning: Image is too big to fit on screen; displaying at 67%

> In imuitools\private\initSize at 72

In imshow at 259 In InProcessing at 16 Undefined function or variable 'fullFileName'.

Error in InProcessing (line 19)

imwrite(im1, fullFileName);

Answer 1

[Mischa Kim]

Suryakanth, in the code you are showing the variable fullFileName is not defined, which is why you get an error for the command imwrite(im1, fullFileName);. So either define the variable

fullFileName = 'my_filename.jpg';    % assuming you want to save as .jpg
imwrite(im1,fullFileName);

or hard-code it:

imwrite(im1,'my_filename.jpg');

[suryakanth]

but after declaring the varaible it throws an error:

-----------------------------------

Error using imwrite (line 459)

Can't open file "my_filename.jpg" for writing.

You may not have write permission.

Error in InProcessing (line 21)

imwrite(im1,fullFileName);

[Mischa Kim]

It seems like you do not have write permissions to the folder you are trying to write to. Make sure you do, otherwise, choose another folder that you have permissions for.

[suryakanth]

sorry !!

i dont know the which folder has that permission.

how to find it