Webcam interface with labview

Hello all,
I need to interface webcam with labview 2011,
My requirement is as follows,
1. Capture the image read by webcam using labview.
2. Store it in local harddisk
3. Compare it with standard image stored in PC and decide whether read image is OK or not.
I am completely new to IMAQ and went through forum also. Can you tell me what are the steps to do this, how to getting started. What software I need to install for this,link and which webcam is good for this.
Thanks
Kudos are always welcome if you got solution to some extent.
I need my difficulties because they are necessary to enjoy my success.
--Ranjeet

1. If you are using a webcam, ensure that the camera is compatible with DirectShow, and that the camera driver is installed and functioning.
2. You will need to install the Vision Acquisition Software. The software features the activation-based NI-IMAQdx driver for acquiring from DirectShow-compliant devices. A license for this software is included with all NI vision hardware and all NI vision software licenses, and is also sold separately for applications that do not require image processing or specialized hardware.
3. I am not sure how you are 'comparing' the acquired image with the image that is stored in the harddisk. But, if you want do machine vision & image processing, then you will need the Vision Development Module. In general, VDM functions are to be used for post processing images. Some example functions are: pattern matching, particle analysis, edge detection, thresholding, histograms, and optical character recognition. This module includes the VAS that was described earlier.
4. There are lots of examples that are shipped with the software to help you understand and achieve what you are trying to do.
Here is a good article that describes the different vision software provided by NI:
What is the Difference Between Vision Software VDM, VBAI, and VAS?
NI Vision Software Comparison
Adnan Zafar
Certified LabVIEW Architect
Coleman Technologies

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2. You will need to install the Vision Acquisition Software. The software features the activation-based NI-IMAQdx driver for acquiring from DirectShow-compliant devices. A license for this software is included with all NI vision hardware and all NI vision software licenses, and is also sold separately for applications that do not require image processing or specialized hardware.
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