However Vision Development Module provides hundreds of functions for processing images, most of them are designed for resolving machine vision applications such as inspecting an appearance of a product along a production line, measuring length or angle of an output, reading barcodes or matching patterns.
OpenCV open computer vision library can be used in LabVIEW for a face recognition application. Refer to
Developing Vision Applications using OpenCV and NI Vision for a getting started instruction for OpenCV in LabVIEW.