html5-img
1 / 7

Scanners, flash drives, digital cameras

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

seven
Download Presentation

Scanners, flash drives, digital cameras

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. 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

More Related