Difference between NI-VAS, NI-VDM ,NI-VBAI

Vision Acquisition Software (VAS)     
 (Necessary Tool for Acquiring images/videos by USB Webcam)

          

             Vision Acquisition Software (VAS) is a set of drivers and utilities used to acquire, display, and save images from a wide range of camera types, including cameras using GigE Vision, IEEE 1394 (FireWire), USB 2.0, USB 3 Vision, or the Camera Link standard. VAS is included in both VDM and VBAI and installs a collection of three drivers:

• NI-IMAQ - acquisition from National Instruments frame grabbers, as well as general display, file saving and acquisition functions
• NI-IMAQdx - acquisition from GigE Vision, IEEE-1394 cameras, USB cameras that are DirectShow compliant (VAS 2009 onwards), and some IP cameras. 
• NI-IMAQ I/O - configuration of FPGA included in the PCI-8254R, PCI-8255R, Compact Vision System The drivers included with NI Vision Acquisition Software (VAS) allow the user to acquire, display, and save images from a wide range of cameras. However, only the NI VDM and NI VBAI software packages include built-in support for advanced image processing and analysis

Vision Development Module (VDM) 

           

              Vision Development Module (VDM) provides machine vision and image processing functions for LabVIEW, C/C++, Visual Basic, and .NET environments. In general, VDM functions are to be used for image processing and analysis. Some example uses include: pattern matching, particle analysis, edge detection, thresholding, histograms, and optical character recognition.

               In addition, VDM includes the Vision Assistant tool, a prototyping and code generation tool similar to NI Vision Builder in its menu-driven interface. Vision Assistant is a useful tool for developing and testing a series of image analysis and processing steps from which code can then be generated. The Vision Development Module is supported on Windows and LabVIEW Real-Time. This means you can use VDM on remote targets such as the NI CVS (Compact Vision System) or an NI Smart Camera.

Vision Builder for Automated Inspection (VBAI) 

           
             Vision Builder for Automated Inspection (VBAI) is a stand-alone, configurable machine vision development environment that requires no programming knowledge to configure. VBAI includes over 100 commonly used vision development tools including pattern matching, optical character recognition, and particle analysis. VBAI can run image processing inspections on remote targets and can also be used to configure those environments.