Input device is used to transmit data to the processing and storage hardware. The data to be input can be in source from, a form that human perceive, or in machine form, a form that can be electronically sensed by another computer. Any device that allows information from outside the computer to be communicated to the computer is considered an input device. Since the central processing unit ( CPU ) of a digital computer can understand only discrete binary information, all computer input devices and circuitry must eventually communicate with the computer in this form. Many devices are capable of performing this task. Some common computer graphics input devices are:
Input devices are of two basic types one is analog and another is digital. Humans perceive a continuous universe; digital devices sense a discrete universe consisting of discrete segments. For example, the temperature indicated by a digital thermometer may be observed to change 73 to 74
o Character printers are basically computerized typewriters. They have a ball or series of bars with actual characters (letters and numbers) embossed on the surface. The appropriate character is struck against the ink ribbon, transferring the character's image to the paper. Character printers are fast and sharp for basic text, but very limited for other use.
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