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kash

Undefined function or method 'getCameraInfo'

Asked by kash
on 24 Jan 2013
I am trying to capture a frame from webcam,for hat i used the coding below
a = imaqhwinfo;
[camera_name, camera_id, format] = getCameraInfo(a);
vid = videoinput(camera_name, camera_id, format);
% Set the properties of the video object
set(vid, 'FramesPerTrigger', Inf);
set(vid, 'ReturnedColorspace', 'rgb')
function [camera_name, camera_id, resolution] = getCameraInfo(a)
camera_name = char(a.InstalledAdaptors(end));
camera_info = imaqhwinfo(camera_name);
camera_id = camera_info.DeviceInfo.DeviceID(end);
resolution = char(camera_info.DeviceInfo.SupportedFormats(end));
i get the below error 
??? Undefined function or method 'getCameraInfo' for input arguments of type
'struct'
please tell how to rectify it

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1 Answer

Answer by Wayne King
on 24 Jan 2013
Edited by Wayne King
on 24 Jan 2013
 Accepted answer

Where have you saved your function getCameraInfo?

Once you create the getCameraInfo.m file, you have to save it in a folder and then add that folder to the MATLAB path, so that MATLAB knows how to find the function.

Use addpath or pathtool to add the folder to the MATLAB path.

For example, assume that you have saved getCameraInfo.m in a folder called

mfiles, use

   >>addpath 'c:\mfiles'  

Obviously the above command is slightly different on linux or Mac.

Or simply enter

>>pathtool

and add the folder using the GUI.

  7 Comments

kash
on 24 Jan 2013

thanks walter

kash
on 24 Jan 2013
i tried another code ,because the above code returns erro some times
imaqhwinfo
dev_info=imaqhwinfo('winvideo',1)
%info=imaqhwinfo('winvideo')
   celldisp(dev_info.SupportedFormats)
  vid=videoinput('winvideo',1,'YUY2_320x240');
%Open Figure
hFigure=figure(1);
%set parameters for video
%Acquire only one frame each time
triggerconfig(vid,'Manual');
set(vid,'framespertrigger',1);
%Go on forever untill stopped
set(vid,'triggerrepeat',Inf);
%Get a grayscale image
set(vid,'ReturnedColorSpace','grayscale');
start(vid);
preview(vid);
for i=1:5
    trigger(vid);
    im=getdata(vid);
    figure,imshow(im(:,:,:,i));
end
stop(vid),delete(vid),clear(vid)
here i get error 
??? Error using ==> clear
Argument must contain a string.
Error in ==> fg at 21
stop(vid),delete(vid),clear(vid)
I am using inbuilt cam in my lap
Walter Roberson
on 24 Jan 2013

clear('vid')


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