Explain about Image Scanner. - Graphics

Explain about Image Scanner.

- Image scanner is a device that scans images, printed text, handwritten documents etc optically.

- A document is placed on a glass window for scanning.

- Scanners use Contact Image Sensor as image / document sensor.

- High-speed scanning for documents is done with rotary scanner.

- Raster scanner uses Carge-Coupled-Device array instead of photomultiplier.

- Planetary scanners are used to scan books.

- 3D scanner is used to scan 3D objects.