Scanner

Scanner [1] is used in the input images and graphics to the computer, where the turning of the graphical nature into a digital image even match the nature of the computer and so easily stored inside the file and is invoked as needed. The scanner looks like a done burner documents and figure below illustrates the internal parts of the optical scanner.

How it works

The paper placed or image to be entered into a computer on the glass top of the scanner.

The computer sends a signal to the plate scanner logical control includes information about how the engine and speed.

Collide with the light source image and then reflected to the scanner lens through a set of mirrors.

Light passes through the lens of the scanner, and up to the members a sense of unity and bilateral shipping CCD

The members of the sense of the unity of bilateral shipping CCD measuring the amount of light reflected on the image and turn it into an analog signal (analog).

Then changed the voltage into digital values ​​by an adapter.

Digital signals are sent from the members of the unit bilateral shipping to the Control Panel and then transferred to the computer again.

The scanners are different from each other by:

The Miz (identify) the image is measured in dots per square inch.

Types (detail below)

Speed ​​read any number of pages per minute

And the type of connection or port.

Moitzh types of optical devices

Scanner flat: CCD method of any coupling device shipments (or dual scan) system, which converts the light falling on them and reflected from the image to be scanned into digital information that is fed by the computer appears on a computer screen on the evidence introduced to him. These devices need to expose more of the light of the time in order to collect the largest possible number of photons falling out so that they can be measured and read.

The cylindrical scanner: PMT is used method of any photomultiplier (or double tubes light). This method is characterized by the registration of the fine details of high quality, where doubling the light falling on the image to be scanned can be easily measured with him and therefore the exposure time is short compared with the flat scanning. These devices are similar in the way they work flat scanning devices, but the difference between them is in the working method and the method of scanning the image and insert where it is wrapped inside the scanner to be scanned image with a disc-like printer discs.

Hand scanners: Scanner is a hand-held and used in the survey and the introduction of the image to the computer through traffic in a manner sliding It is used in the introduction of small-scale images.