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Scanners, flash drives, digital cameras

Scanners, flash drives, digital cameras Scanners Types: handheld, flatbed, film/slide, drum(industrial)

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Scanners, flash drives, digital cameras

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  1. Scanners, flash drives, digital cameras

  2. 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

  3. 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 andthe 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

  4. 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?

  5. 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

  6. 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

  7. 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

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