Image Acquisitionand Proces

Displaying Images 67
FIGURE 4.3 Simple multiple image display.
FIGURE 4.4 Simple multiple image display — wiring diagram.
IMAQ WindClose terminal “Close All Windows?” to true, and all windows currently
open (including any embedded windows, as discussed later) will close.
4.2 DISPLAYING IMAGES WITHIN YOUR FRONT
PANEL
Although displaying your image in ßoating windows can be useful, a common
question asked by beginner Vision Toolkit programmers is, “how do I embed a
dynamic image in my front panel?” There are several methods of doing so, depending
on what you want to display and the speed restrictions you are willing to accept.
4.2.1 THE INTENSITY GRAPH
The simplest method of displaying an image on a VI’s front panel is to convert it
to an intensity graph (Figure 4.5). This method uses IMAQ ImageToArray (Figure
4.6) to convert the image data to an array that the intensity graph can plot. Do not
forget to either autoscale the z axis (intensity), or set its upper limit to an appropriate
value (the default is 100, whereas you will probably need to set it to 255, as shown
in Figure 4.5), otherwise your intensity data will be clipped.