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There is no part of the CPU that captures graphic data directly from a document for input into the computer.

This is the responsibility of an external peripheral device called a document scanner.

The CPU is normally not involved in capturing graphic data though it may be involved in controlling the device which does the graphic input. Graphic input can be done with a digital document scanner, digital camera, or a printer or fax machine with the ability to scan a document and feed it into a computer. Some of these devices are called 3-in-1 or All-in-One printers.

Many of these devices actually have embedded computers with their own CPU controlling the device. Some such devices have internal storage where they can keep the captured graphic data until it can be moved to a computer. Others have a simpler design and need to be connected to a computer to work at all.

These devices connect to a computer in a number of ways and involves a program and a CPU. One direct way is to use a USB cable for controlling and transferring data from the device. An older method was to use a parallel connection on the computer. More capable devices do networking and can be controlled by, and transfer data to the computer using a network cable or WIFI.

Once the captured graphic is transferred into the computer it can be viewed, modified, copied, emailed, and printed. If it is a scanned in text document, it may also be converted into a real text/word document using OCR (Optical Character Recognition) software.

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