Scanners

Device used to scan text documents, images, objects and convert it into digital image.
Scanning technology that converts physical image, text into digital image file on the computer.
Scans light and dark area as well as color on scanned document.
After scanning these images can be printed on paper or stored on storage devices.
3D Scanner also exist but cost is high.

Flatbed scanner:

Consists of glass pane under which there is bright light.
This bright light illuminates the pane and a moving optical array in Charge Couple Device (CCD) scanning.
CCD type scanners contains three rows of sensors with red, green ,blue filters.
Contact Image Sensor (CIS) scanning consists of moving set of red, green blue LED's strobed.
LED's are used for illumination and a connected monochromatic photodiode array of light collection.
Images are kept on face down of the glass an opaque cover is lowered over it.
Sensor array and light source move across the pane for reading the area.
An image is therefore visible to detector because of light it reflects.
It is some what difficult to scan transparent images.

Uses

Portable scanner:

Handheld device that slides across the text, image and object directly.
Scanning images requires steady hand or uneven scanning would create distorted image.
Most scanners produced light from an array of green LED's to illuminate the image.
Can save more than 100 images at a time.

Uses

Hardware Categories