A scanner is a device that has succeeded telephotography. These days, there are different scanners being sold in the market.

A scanner is an input device that:
- scans images
- prints text
- prints handwriting
- prints an object and converts it to digital images

Kinds of Scanners
- Drum scanners have rotating drums with a one-photo detector for a standard speed of 60 or 120 rpm. Using a telephone voice line to receptor, they can send linear analog AM signals. It prints the proportional intensity on special paper synchronously. This was used from the 1920s to the 1990s.
Color photos were sent as three separated and repeated RGB filtered images. This was only used occasionally because of the transmission cost.
- Desktop scanners or flatbed scanners found in offices are common examples of scanners. Documents are placed on the glass window for scanning.
- Handheld scanners are devices moved by hand. It evolves from text scanning to 3D scanners which are used for:
• industrial design
• reverse engineering
• test measurement
• orthotics
• gaming and more

These mechanically-driven scanners are used for large-format documents. Flatbed designs are not practical.

What these scanners use:
1. Modern scanners use image sensors such as:
• Charge-coupled device (CCD) or
• Contact Image Sensor (CIS)
2. Older drum scanners use a photomultiplier tube as its image sensor.
3. Rotary Scanner uses a CCD selection instead of a photomultiplier. Rotary Scanner is used for express document scanning. This is another type of drum scanner.
4. Planetary Scanner takes photographs of books and documents.
5. 3D Scanners are used for producing three-dimensional models of objects.

Other category of scanners:
Digital Camera Scanners
This is a reprographic camera. It becomes an attractive alternative to ordinary scanners. The disadvantages of this scanner are:
• distortion
• reflection
• shadows
• low contrast Read the rest of this entry »

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