MATLAB Answers


Camera access problem in matlab

Asked by Lalit Patil on 12 Dec 2012

I have a PPT vision's lan port connected camera..

I want to access it in MATLAB..

Image aquisition toolbox doesn't shows its information.

So, how to access it..?


Is "PPT" in this context "PowerPoint" ?

No, it is the company of camera...

2 Answers

Answer by Image Analyst
on 12 Dec 2012

Are you using Windows? Does the camera show up in Device Manager? If it doesn't show up there, then it won't be seen in imaqtool. If Windows does see it, then you should contact the manufacturer or the Mathworks to see which of several video "adapters" is supposed to see your camera. Some adapters are written by the Mathworks and some are written by the camera manufacturers.

What do you see when you do this:

hardwareInfo = imaqhwinfo % Print what cameras are there.
adaptorNames = hardwareInfo.InstalledAdaptors
% Might look something like:
% InstalledAdaptors: {'dcam'  'gentl'  'gige'  'PPT' 'lumeneraimaqw64'  'matrox'  'winvideo'}
matches = strfind(adaptorNames, 'PPT');
% Find out which index is the PPT Camera.
PPTIndex = find(~cellfun(@isempty, matches))
thePPTAdaptor = adaptorNames{PPTIndex}


I am using windows..

And in Device manager in Imaging devices only it shows webcam..

After first two lines it shows

InstalledAdaptors: {'coreco' 'winvideo'}

        MATLABVersion: '7.7 (R2008b)'
          ToolboxName: 'Image Acquisition Toolbox'
       ToolboxVersion: '3.2 (R2008b)'

adaptorNames =

    'coreco'    'winvideo'

But it is a laptop webcam..

It shows mathes = [] []

Like David says, your camera is not supported with an adapter. Contact the manufacturer or select a different, supported camera.

Answer by David Tarkowski
on 13 Dec 2012

Image Acquisition Toolbox does not support these cameras and I can't find any indication that PPT Vision provides MATLAB support for these cameras, either. You could write an adaptor (or convince PPT Vision to do so) for the Image Acquisition Toolbox using the toolbox's adaptor kit which would allow these cameras to be used with the toolbox. However, these cameras appear to be smart cameras, so even if somebody were to create an adaptor, only a small percentage of the camera's functionality would be available via the toolbox.


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