Document Scanners

1
Document Scanners

• Going Digital
• online articles
• pictures / photos
• A flow of ideas

2
Parts

• Light Source
• fluorescent lamp
• Xenon gas lamp
• LEDs
• Lens
• Mirror
• Detector / Sensor
• CCD
• photomultiplier
• CIS

3

• Flatbed Scanner
• Handheld Scanner
• Sheet-fed Scanner
• Drum scanner

4
The Image

• Resolution measured in dots per inch
• flatbed scanners have 300 to 600 dpi
• Interpolation
• Flatbed scanners can have 2400 to 9600 dpi
• Moiré pattern removal
• 2 repetitive patterns overlap
• Scanning dots with dots