Scanners, flash drives, digital cameras

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Scanners, flash drives, digital cameras
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Scanners

• Types handheld, flatbed, film/slide,
  drum(industrial)
• Components Charge-coupled device (CCD) array,
  mirrors, scan head, glass plate, lamp, lens,
  cover, filters, stepper motor, stabilizer bar,
  belt, power supply, interface port(s), control
  circuitry
• How it works lamp lights document, scan head
  moves across the document, mirrors reflect the
  image onto a lens, and the lens focuses the image
  through a filter on the CCD array.
• The marketplace

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Scanners

• Quality measurement
• CCD vs. CIS (Contact Image Sensor)
• Resolution hardware sampling (1,200-4,800 dpi),
  and software (interpolation) 9,600- unlimited.
• Sharpness depends on the quality of the lens
  and the brightness of the lamp.
• Depth 36-bit, up to 48-bit color, but output is
  24-bit
• Interfaces
• USB, SCSI, FireWire, parallel
• Software Twain and WIA (conflicts in XP)
• Scanner FAQ

Use XnView to edit
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Flash RAM and drives

• Flash RAM basics
• a solid state storage a type of SRAM, EEPROM
  chip
• nonvolatile and does not require constant power
  to retain information, unlike DRAM.
• How it works cells values are defined by rows
  and columns grid using tunneling.
• Devices that use flash RAM
• BIOS chip
• memory cards PDAs, cameras, MP3 players, etc
• smart cards future of smart cards?
• flash USB drives why not replace hard-drives?

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Flash USB drives

• Flash USB drive basics
• NAND flash memory (cells arranged serially)
  integrated with a USB interface , up to 8 GB of
  storage
• components USB connector, USB mass storage
  controller (CPU and memory), flash memory chip,
  crystal oscillator (clock), LED
• More
• The USB Flash drive alliance
• Making the USB flash drive bootable
• Portable applications for USB flash drives

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Digital cameras

• Digital camera basics
• based on CCD (we saw it in scanners) sample the
  original light that bounces off the subject,
  converting light patterns into pixel values
• resolution the number of unique cells in the
  CCD, measured in megapixels
• capturing color color filter array over each
  photosite
• exposure, focus and zoom
• storage media flash RAM and file sizes
• interfaces USB or FireWire, also storage media
  readers (floppy, USB)
• Image management XP, XnView

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Digital camcorders

• The basics
• analog camcorders CCD, lens and motors to
  handle zoom, focus and aperture, VCR shrunk
  down to fit in it.
• digital camcorders captures a frame of video
  from the CCD and (using an analog-to-digital
  converter) records the signals as bytes in a
  tape, DVD or hard-drive.
• digital formats MiniDV, Digital8, DVD, memory
  cards
• The marketplace
• digital camcorders 2002, 2004, 2005
• digital cameras big cameras for beginners