1 / 17

Scanner

Scanner. Scanner. Introduction: Scanner is an input device. It reads the graphical images or line art or text from the source and converts it into digital information and send it to the computer. Scanner is electronic device that scans data.

elizabethcruz
Télécharger la présentation

Scanner

An Image/Link below is provided (as is) to download presentation Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author. Content is provided to you AS IS for your information and personal use only. Download presentation by click this link. While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server. During download, if you can't get a presentation, the file might be deleted by the publisher.

E N D

Presentation Transcript

  1. Scanner

  2. Scanner Introduction: • Scanner is an input device. • It reads the graphical images or line art or text from the source and converts it into digital information and send it to the computer. • Scanner is electronic device that scans data. • Scanners are used to give large volume of data as input to the computer.

  3. Specification of scanner: • Scan speed photo color,10*15cm,OCR A4 • Optical resolution4800 dpi*9600 dpi • Min temperature:50 to 95 degree. • Operating humidity range:15-85% • OS:windows, MacOS, windows 7/8/XP/2000. • Power supply: 15W • Port required: hi-speed USB

  4. Types of scanner • Flat bed scanners • Sheet fed scanners • Hand held scanners • Drum scanners

  5. Sheet fed scanners Flat bed scanners Hand held scanners

  6. Operation • Scanner is operates on the principle of reflection . • That is , when a light source falls on an image document , the incident light reflects. • The reflection depends upon the color and size of the images in the document.

  7. Structure of Scanner • That is black or white spaces reflect more light than colored or inked letters or images.

  8. Cont., • The light from the lamp is made to fall on the document through the glass plate. • The head receives the reflected light from the document with the help of mirrors (m). • The reflected light is filtered with the help of R,G,B filters.

  9. Cont., • The filtered light is made to fall on a light sensor having 1024 elements using a mirror and a lens. • The sensor converts the analog signals into digital signals and is given as output. • The scan head is moved over the document with the help of a motor.

  10. Scan Resolution • The number of dots or pixels per inch a scanner can resoluve for a document. • In other words resolution relates to the fineness or clarity of the image scanned by the scanner.

  11. Different Resolutions • 200 dpi – Dots Per Inch • 400 dpi • 600 dpi and so on. • The more dots per inch a scanner can resolve, the more clarity the resulting image will have.

  12. Flatbed scanner • Scan documents, photos, flat object from a PC or laptop. • Works like copy or Xerox machine. • Flatbed is made up of glass pane and moving CCD array and two mirrors. • Most common type of scanner easy to operate, widely used.

  13. Flatbed scanner specification • Scanner type: flatbed • Size:280*486*52mm • Weight :1.7kg • Interface:USB1.0 • H/W reslution:1200DPI. • AC voltage:200-240V 50Hz

  14. Sheet-fed scanner • Sheet-fed Scanner smaller and portable • Used to scan document and photos • Document is fed into horizontal and vertical slot provided with scanner • Components of scanner sheet-feeder, scanning module & calibration sheet. • Scan single page documents. • Not used to scan thicker objects.

  15. Handheld scanner • Smaller in size. • It is scanning device which is moved over the object that needs to be scanned . • To scan the document drag the scanner over document. • Used in barcode scanner. • Image quality is very poor.

  16. Drum scanner • Used in publishing industry. • Color drum scanners use three matched photo multiplier tube. • High resolution high quality. • More Expensive. • Drum scanners are slow.

  17. Scan modes • Line art • Half toning • Gray scale • True color

More Related