January 26, 2011

 Digitizer

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Digitizer (also known as Drawing Tablets, Graphics Tablets and Digitizer Tablets) is a graphical input device that convert analog documents, graphic, picture, maps and other data into digital form which can be sent to the computer for processing and storage in memory. It is also called pointer device or optical device. An example of digitizer is a Graphic Tablet. This input device is very useful when drawing large drawings, maps etc, and also great time savers when entering data into CAD (Computer Aided Design) programs. Digitizer generally used in Auto CAD (Computer Aided Design) and Geographic Information System (GIS) applications.

A digitizer consists of a flat glossary surface and a pointing device similar to a pen, when the pointing device moves across the glassy surface a pointer on the screen moves according to the pointer device movements. We can draw picture/image/map or select an application by pressing the pointing device and moves it according to the picture.
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January 14, 2011

 Scanner

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Scanner is an optical device that optically scans documents, images and printed text convert it into a file format or digital format that may be used in the personal computer. You can use the scanner with special software to read text. When used an optical character recognition software, a scanner can convert printed, handwriting text into a digital file format that can be read by a word processor. The common types of optical scanner devices are i) Magnetic Ink Character Recognition (MICR) ii) Optical Mark Reader (OMR) iii) Optical Character Reader or Recognition (OCR). OCR’s are expensive though better the MICR.

The most common types of scanners are Flatbed Scanner, Sheetfed Scanner, Handheld Scanner, Drum Scanner, Photo Scanner, Film Scanner, Slide Scanners and Portable Scanners, etc.

Some of the scanner manufacturer companies are : Epson, Hewlett-Packard (HP), Canon and Fujitsu etc.,

The most popular Optical Character Recognition (OCR) softwares are : ABBYY FineReader, OmniPage, Simple OCR and Zonal OCR etc.,
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December 30, 2010

 CD-ROM Drive

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CD ROM stands for "Compact Disc Read Only Memory".  A CD-ROM drive is the same size as a floppy disk drive.  It is a storage device that accepts data CD ROM’s (Compact Discs).  It is a box shaped device that fits into the case of the computer. A CD-ROM drive is an optical device which means it uses a laser to record information. Most new computers DVD drives have replaced CD ROM drives. A CD ROM drive will only play CD’s, not for DVD’s. 
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December 16, 2010

 Mouse

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A Mouse is hand held pointing device that allows you to control your computer without having to type in instructions at the keyboard. It connected to computer by a cable. It usually contains two or three buttons.

The mouse is kept on a flat surface. When you move the mouse on the flat surface, the mouse pointer also moves in the same direction on the screen. It is used to move the cursor on the screen. And pressing the buttons on the mouse lets you select options and to execute commands on the screen. The cursor moves very fast with mouse giving you more freedom to work in any direction. Mouse is very useful and easy to choose specific options from the menu.

 There are many different types of mouse available today in the market
  
Serial Mouse : This type of mouse with a serial connector, it requires a free serial port on your PC.

PS/2 Mouse : This type of mouse is connected  to a PS/2  port.

Optical Mouse : This type of mouse uses a laser for detecting the mouse movement. It doesn’t need a mouse pad. And they are more reliable and require less maintenance.

USB Mouse : This type of mouse is connected to the USB connector and requires a free USB port.

Cordless Mouse : This type of mouse has no cable, it used batteries for its power supply. This type of mouse not connected to the computer. They used infrared or radio waves to communicate with the computer. 

Wireless Mouse : A wireless mouse is connected to the computers using Bluetooth technology, except that no cable is used to connect the mouse to the computer.


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