Problem with image control using more than 1 web cam

Question

Hi,
I am using logitech quickcam pro 4000.Actually I want to get image from
3 web cam at a time wich will act as a CCTV.I want to get picture from
more than 1 web cam at a time.But,When I start the .vi,than I get image
from 1 web cam.I have attached the vi and the demonstration file.
If anyone  has any idea please send me a reply.
(The code was constructed using information
from the Logitech Software Development Kit, downloaded from the Logitech web
site January 4th 2004.  This
package includes the royalty free distribution with the camera driver.
To install the package, download and unzip
LabVIEW Logitech UWA.zip and run Setup.exe in the 'redist' folder.  This installs drivers (if not already
installed).  Then run LabVIEW and open
Logitech Image Acquisition Master.vi. 
Click the LabVIEW run button.
Notes for Understanding the Code
[1] The camera is controlled by an Active-X
reference from a front panel Acitve-X container that displays the pre-view
image.  To create this, create a blank
Active-X container on the front panel and select the Active-X Hydra Video
Portal class.
[2] Three methods are called, following the
Visual Basic guide from Logitech.  The
first establishes a connection to the Active-X server.  The status bar is activated in the preview
window (EnableUIElements), and we connect a camera (ConnectCamera2).
[3] Here we set the value of property
'EnablePreview' to turn on the preview panel.
[4] We can get the camera description for
camera zero here (the first camera connected).
[5] Here we select the video format (64x480
– can change it later).  The next call
establishes the preview size by setting property values.  The preview size should be the same as the
video format for fastest image acquisition.
[6] We are restricted to saving the picture
to a BMP file and then reading it in again. 
This is a limitation of the SDK. 
After reading the image file we can change it to a JPG if we wish to.
[7] Here we re-read the image file and
provide it to ImageDisplay.vi.
Other methods and property values are
reasonably self evident.  In LabVIEW, if
you right click the Active-X reference terminal on any method, you can create a
new method by simply selecting the appropriate one from a list.  The parameters for the method appear
automatically and should be reasonably self-evident from the names.  If you want more details, download the SDK
from Logitech.
Other methods allow you to make movies in
real-time or time-lapse sequences.
Note that you can also monitor Active-X
events to detect inputs or parameter changes made elsewhere.  For example it is possible to detect when
the button on the camera is pressed.)
Thanks
Kabir
Kabir mamun
PhD Student,DCU
[email protected]
www.iward2010.blogspot.com
Attachments:
Logitech Image Acquisition Master.vi ‏98 KB

Answer 1

Hi Peter,
Thanks for your e-mail.And sorry for late.
I have changed my activex server in my labview programme.Current 
server name is XVideoOCX.I have attached 1 example.Still I am facing
the same problem that I am not getting disply from more than 1 web
cam.So would you be able to advice me,what should I do regarding this
matter.
Actually,This is a part  of my M.Sc project.I am under pressure.Peter,Please do me  this fevour.
Thanks
Kabir
1 eample from help file:
Video Disply
1. Choose the input mode (Video, Single Image Files, Screen, etc.)
XSetInputMode(0) // This
chooses video as input
2. Choose the video device
XSetVideoInput(0) //
Choose the first available video input device
3. Initialize XVideoOCX
XInit() // Initialize
XVideoOCX
4. Start internal video capture
XStart()
now XVideoOCX should display the live video
5. Stop internal video capture
XStop()
6. Close XVideoOCX
XClose()
Kabir mamun
PhD Student,DCU
[email protected]
www.iward2010.blogspot.com
Attachments:
ax2.vi ‏23 KB