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Bars are codes that represent different numbers. One can see the barcode on the back cover of this book
as well. A barcode reader emits a beam of light laser beam, which reflects the barcode image. A
light-sensitive detector is present in the bar code reader which identifies and reads the bar code image.
The bar pattern is changed into numeric code inside the CPU.
Microphone
A microphone is a voice based input device. With the help of this device, sound or voice
is recognised/recorded in the computer and is converted into digital form which is then
played or processed by the computer.
Digital Camera
A digital camera captures images or pictures momentarily and converts
the image directly into digital form and stores it in memory. It can then be
viewed on the computer or compatible devices.
It is available in various models with different specifications that include
pixels, sizes and memory. The quality of image captured by digital camera
is measured in pixels.
Web Camera
A web camera or a webcam is a type of video camera that captures images or visuals
in real-time and passes data to a computer via USB, ethernet or Wi-Fi. Webcams do
not have built-in storage like a digital camera.
Web camera is used to create video links and allows set up of authentic
video-conference stations. Some built-in webcams can be remotely activated from
far off locations. Webcams can also be used for security and surveillance purposes by
monitoring the captured visuals.
Biometric Devices
These devices use the physical characteristics of a living being to authenticate
its identity. These devices are capable of scanning handprints, fingerprints,
retinal information, facial features etc. to compare with a sample and grant
access to an individual to a particular device or information. Example: Used in
phones for security and used for attendance tracking in offices.
Notes
Biometric Sensor is a device which captures unique information from human body. The unique
information can be fingerprints, iris pattern, etc. It stores and compares to match the information
with the available database.
Basics of Information Technology 17

