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174 CHAPTER 6 ■ VISION

Figure 6-4. JMStudio

Figure 6-5. The JMF Registry Editor

Code Objective
The code objective in this section is to verify that the JMF was installed by finding the webcam
via the MediaLocator.

Code Discussion

This will be a simple test class. The String variable URL will be the locator defined by the JMF
Registry Editor. To find the camera, we need to create a MediaLocator object via the URL. Then
we’ll create a Processor object using the MediaLocator object. If there are no exceptions, every-
thing works and we’re ready to start doing some image capture with the webcam. If not, an
exception will print to System.out. See Example 6-6.

■Note If you have more than one webcam, the Java Media Framework using Video For Windows can only
utilize one camera per JVM. If you have this camera opened or want to use a different webcam, you’ll see a
Video Source window where you can select a new camera (see Figure 6-6).