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Almost all webcams use USB connections Windows comes with a limited set of webcam drivers, so always make sure to install the drivers supplied with the camera before you plug it in Most webcams use Hi-Speed USB, so make sure you re plugging your webcam into a Hi-Speed USB port Once the camera s plugged in, you ll need to test it All cameras come with some type of program, but finding the program can be a challenge Some brands put the program in the system tray, some place it in My
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Computer, and others put it in the Control Panel and some do all three! Figure 1444 shows the Control Panel applet that appeared when I installed the webcam driver The biggest challenge to using webcams is getting your webcam applications to recognize that your webcam is available and configured for use Every program does this differently, but conceptually the steps are basically the same (with plenty of exceptions): 1 2 3 4 Tell the program you want to use a camera Tell the program whether you want the camera to turn on automatically when you chat Configure the image quality Test the camera
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If you re having problems with a camera, always go through the general I/O problems first, as this will clear up most problems If you re still having problems getting the camera to work in a program, be sure to turn off all other programs that may also be using the camera Windows allows only one program at a time to use a webcam
Specialty I/O Devices
The CompTIA A+ certification exams want to make sure you re aware of two other types of I/O devices: biometric scanners and touch screens Let s look at these fairly specialized devices
Biometric Devices
If you look up biometrics on the popular Wikipedia Web site, you ll get the following definition: Biometrics (ancient Greek: bios = life, metron = measure ) is the study of automated methods for uniquely recognizing humans based upon one or more intrinsic physical or behavioral traits The field of biometrics also encompasses a number of security devices, such as door locks and security cameras, that don t really fit into the world of PCs This section concentrates on the types of biometrics that you can actually buy and use on your PC Within the realm of computers, biometrics includes a huge number of technologies, from thumb drives that read fingerprints, to software that does voice recognition PCs use biometrics for security Biometric devices scan and remember unique aspects of various body parts such as your retina, iris, head image, or fingerprint, using some form of sensing device such as a retinal scanner This information is used as a key to prevent unauthorized people from accessing whatever the biometric device is securing Most biometric devices currently used in PCs secure only themselves The USB thumb drive in Figure 1445 has a tiny fingerprint scanner You slide your finger (any finger, you choose) over the drive to unlock the contents of the thumb drive Less common are biometric security devices that secure entire computers The Microsoft fingerprint scanner is a USB device that replaces standard user name and password security Figure 1446 shows the scanner built into 456
Mike Meyers CompTIA A+ Guide: Essentials (Exam 220-601)
a keyboard When a program or Web site asks for a user name and password, you simply press your finger against the fingerprint scanner It will confirm your identity (assuming your fingerprint matches), and then special software that comes with the scanner will supply the program or Web site with your stored user name and password Biometric devices are also used for recognition Recognition is different from security in that the biometric device doesn t care who you are, it just wants to know what you re doing The best example of this is voice recognition Voice recognition programs convert human voice input into commands or text Voice recognition for PCs has been around for some time While it has never achieved enough accuracy to replace a keyboard completely, voice recognition is common in devices that have a limited number of commands to interpret, such as cell phones and PDAs If you speak the words Call Mike Meyers into your PocketPC PDA/ phone (Figure 1447), your phone knows what to do at least, my phone does! No matter what biometric device you use, you use the same steps to make it work: 1 2 Install the device Register your identity with the device by sticking your eye, finger, or other unique body part (why are you snickering ) into the device so it can scan you Configure its software to tell the device what to do when it recognizes your scanned identity
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