how can give an image as input in a fuction?

1 view (last 30 days)
sara
sara on 19 Sep 2014
Commented: sara on 22 Sep 2014
hi I want to define a function that every time that I call it, it get an image address and do some process on this image I don't want to use 'input.tif' because I want to use this function in a loop and use the result of this for the next image...
if true
function [ maskedImage] = myprog(folder,baseFileName)
fullFileName = fullfile(folder, baseFileName);
grayImage = imread(fullFileName);
....
end
end
  4 Comments
Image Analyst
Image Analyst on 19 Sep 2014
Edited: Image Analyst on 19 Sep 2014
We don't know what line 29 is. You forgot to post the error message - you just snipped out an almost useless part of it. Please post ALL the red text - don't snip out part of it or paraphrase it, just give it exactly. Presumably you called it with an actual names of some folder and file and didn't pass in 'folder' and 'baseFileName.tif'.
sara
sara on 19 Sep 2014
line 29 is
grayImage = imread(fullFileName);
I attach my code below thanks Image Analyst

Sign in to comment.

Answers (4)

Image Analyst
Image Analyst on 21 Sep 2014
In myprog(), you have this line:
clear; % Erase all existing variables. Or clearvars if you want.
you must remember to never, ever have that in a function . If you use it, it must be in a script . What happens is that when you call clear, it wipes out the filename that you passed in.
  1 Comment
sara
sara on 22 Sep 2014
oh thanks dear Image Analyst you are a clever person.. I have an other question... if I want to save the results of my code in an array Is there any way to save them ...I mean that I want to have an array that I can to save for 6 grayscale images in it...I couldn't save 6 images in an array.... thanks

Sign in to comment.


Iain
Iain on 19 Sep 2014
Ok, if by "image" you mean filename, then you can do it like this:
folder = 'C:\My Images\';
files = dir([folder '\*.jpg']);
for i = 1:numel(files)
filename = [folder files(i).name];
% ... etc etc
end
  1 Comment
David Young
David Young on 19 Sep 2014
It's more robust to use
filename = fullfile(folder, files(i).name);

Sign in to comment.


sara
sara on 19 Sep 2014
Edited: sara on 19 Sep 2014
thanks but when I do what you say .I have this error
if true
Reference to a cleared variable fullFileName
end
..
I attach my codes I want to use myprog in loop ...do you know where did I do wrong??

sara
sara on 21 Sep 2014
ok. thanks I am beginner can you help me more? I was in the folder that includes my images. I use this
if true
filename=ones(1,12);
files = dir(['\*.tif']);
for i = 1:12(files)
filename = files(i)
end
end
but I have this message:
if true
files =
0x1 struct array with fields:
name
date
bytes
isdir
datenum end
where is my error... thanks.

Categories

Find more on Introduction to Installation and Licensing in Help Center and File Exchange

Community Treasure Hunt

Find the treasures in MATLAB Central and discover how the community can help you!

Start Hunting!