of information into the computer. QR (Quick response) Code: The QR code is the two dimension bar code which can be read by a camera and processed to interpert the image. ( ) Voice Input Systems: Microphone serves as a voice Input device. It captures the voice data and send it to the Computer.
Using the microphone along with speech recognition software can offer a completely Figure . Optical Character Reader Figure . Bar code Reader Figure . Voice input System new approach to input information into the Computer.
( ) Digital Camera: It captures images / videos directly in the digital form. It uses a CCD (Charge Coupled Device) electronic chip. When light falls on the chip through the lens, it converts light rays into digital format. ( ) Touch Screen: A touch screen is a display device that allows the user to interact with a computer by using the finger.
It can be quite useful as an alternative to a mouse or keyboard for navigating a Graphical User Interface (GUI). Touch screens are used on a wide variety of devices such as computers, laptops, monitors, smart phones, tablets, cash registers and information kiosks. Some touch screens use a grid of infrared beams to sense the presence of a finger instead of utilizing touch-sensitive input. ( ) Keyer : A Keyer is a device for signaling by hand, by way of pressing one or more switches.
Modern keyers have a large number of switches but not as many as a full size keyboard. Figure . Digital Camera Figure . Touch Screen Figure .
Keyer Typically, this number is between and . A keyer differs from a keyboard, which has "no board", but the keys are arranged in a cluster. Output Devices: ( ) Monitor: Monitor is the most commonly used output device to display the information. It looks like a TV.
Pictures on a monitor are formed with picture elements called PIXELS. Monitors may either be Monochrome which display text or images in Black and White or can be color, which display results in multiple colors. There are many types