How can I use a USB webcam on Ubuntu linux 64-bit with MATLAB R2014b?

Hi,

I can't use the Image Acquisition toolbox on Ubuntu linux 64-bit with MATLAB R2014b because I received this error:

'Error using imaqdevice/preview (line 176) Could not connect to the image acquisition device. Device may be in use.'

I have already installed the OS Generic Video Interface and the webcam works fine with 'cheese'.

Thanks

Answer 1

[Giorgos Papakonstantinou]

I have exactly the same problem with the same configuration (Check a similar post here ). I have not found a solution yet. Some relevant information can be found here.

I have tried to run matlab from the terminal like this:

 LD_PRELOAD=/usr/lib/i386-linux-gnu/libv4l/v4l2convert.so matlab

or

 LD_PRELOAD=/usr/lib/i386-linux-gnu/libv4l/v4l1compat.so matlab

which gives me the following error:

ld.so: object '/usr/lib/i386-linux-gnu/libv4l/v4l2convert.so' from LD_PRELOAD cannot be preloaded (wrong ELF class: ELFCLASS32): ignored

Consequently, I have not managed to solve the problem and get my camera working with matlab.

Did you finally fix it? I would appreciate if you have any info.

Thank you

Answer 2

[Pascal Heinrich]

Hey,

sadly I have to say that I have not managed to work it on my machine but you have to figure out if your cam is supported by the uvc driver

http://www.ideasonboard.org/uvc/

My cam is supported but the problem remains the same :(

Also I have tried to start matlab as root (maybe permission problems) without luck.

Any further ideas?

Thank you