How does a scanner capture a image?

Answer 1

There are a few different types of image scanners, most modern ones use a charge-coupled device (CCD) or a contact image sensor(CIS) as the image sensor. In a flatbed scanner this sensor is mounted on an aparatus which moves the sensor across the page to scan the entire image. In a hand-held scanner the sensor is mounted in a drum which the user rolls across the page to scan the image.

Answer 2

A scanner pretty much works like a copy machine, the main difference being, a scanner will convert the image into a digital format for electronic use. How do you acquire an image? Two options 1> Use the software provided with the scanner 2> Using MS Office, you can insert image->get from scanner-> this will initiate the scanner and convert the image to digital formate (JPEG) and insert in your document.

Answer 3

In computing, an image scanner-often abbreviated to just scanner- is a device that optically scans images, printed text, handwriting, or an object, and converts it to a digital image. Common examples found in offices are variations of the desktop (or flatbed) scanner where the document is placed on a glass window for scanning. Hand-held scanners, where the device is moved by hand, have evolved from text scanning "wands" to 3D scanners used for industrial design, reverse engineering, test and measurement, orthotics, gaming and other applications. Mechanically driven scanners that move the document are typically used for large-format documents, where a flatbed design would be impractical.

Modern scanners typically use a charge-coupled device (CCD) or a Contact Image Sensor (CIS) as the image sensor, whereas older drum scanners use a photomultiplier tube as the image sensor. A rotary scanner, used for high-speed document scanning, is another type of drum scanner, using a CCD array instead of a photomultiplier. Other types of scanners are planetary scanners, which take photographs of books and documents, and 3D scanners, for producing three-dimensional models of objects.

Another category of scanner is digital camera scanners, which are based on the concept of reprographic cameras. Due to increasing resolution and new features such as anti-shake, digital cameras have become an attractive alternative to regular scanners. While still having disadvantages compared to traditional scanners (such as distortion, reflections, shadows, low contrast), digital cameras offer advantages such as speed, portability and gentle digitizing of thick documents without damaging the book spine. New scanning technologies are combining 3D scanners with digital cameras to create full-color, photo-realistic 3D models of objects

source wikipedia

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Answer 4

The bar code reader is special type of image scanner. Image scanners convert any printed image into electronic form by shining light onto the image and sensing the intensity of the light’s reflection at every point.