Image Acquisitionand Proces

58 Image Acquisition Processing with LabVIEW
FIGURE 3.18 Single Capture with Processing and Display.
hold image data captured from an imaging device. The resulting IMAQ image can
be used with any of the Vision Toolkit VIs. Likewise, any processed images from
the Toolkit can be converted back into the picture format using the Webcam IMAQ
to Picture VI for display. The block diagram in Figure 3.19 demonstrates conversions
to and from the IMAQ format to perform a binary threshold operation on a single
captured image and display the result.
FIGURE 3.19 Continuous Capture with Processing and Display.
3.4.2.3 Continuous Capture with Processing and Display
Processing can also be done within a continuous capture session by including the
necessary VIs within the capture loop. The one notable difference is that the IMAQ
image is created outside of the loop and passed to the Webcam Flat to IMAQ VI.
The block diagram in Figure 3.20 demonstrates continuous image acquisition, processing
and display loop.
3.4.2.4 Future Work
The Webcam library represents a solid step forward in providing robust, intuitive
and inexpensive image acquisition functionality in LabVIEW. However, the library
itself can still be improved by the addition of error reporting, and extended to run
on operating systems other than Windows. The project is under an open source
license, allowing all those who wish to improve or modify the library the freedom
to do so.