On the current market, there are lots of different types of scanner with specifications. Therefore, each device will have its own characteristics.
1: Hand-Held Scanner
This device is a type of compact portable image scanner.It is suitable for scanning a small or large area. This machine has high mobility but the image quality is not very good, therefore, it is only used for scanning code.
2: Sheet-Fed Scanner
This device has to load paper, just like a printer. It is suitable for scanning single document, it does not support for scanning multiple documents. The disadvantage of this device is that the obtained image is evaluated only at average level.
3: Flatbed Scanner
This machine has the same mechanism with a copier. Document that needs to be scanned will be placed on a flat glass of the machine and the light will scan the image. This device offers the sharpest quality.
4: 3D Scanner
It is used mostly to scan 3D objects in such case of creating 3D models. Regularly, this is the choice for producers in entertainment industry.
5: Multi-functional Image Scanner
This multi-functional scanner combines various functions on a machine such as scanning, printing, photocopying, faxing,ect. It can scan for both white-black or colorful document. In fact, this is widely used in small offices.
Besides overview of devices, specifications are also quite concerned. Below are some specifications of scanners.
Manufacturers
Before you buy the device, manufacturer is always a concern of users. However, it is difficult to give an exact answer for choosing the best manufacturer or brand. For example, Canon's scanner is commonly used and it is the most affordable for family. Epson is also suitable for those who work in graphical industry. HP is the choice for most of staffs in office.