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Digital Video Camera

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The videos can be copied without any loss in quality. ... What kind of photographer are you - casual snap-shooter or advanced amateur? Recommendations: ... – PowerPoint PPT presentation

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Title: Digital Video Camera


1
Digital Video Camera
  • Group Audio/Visual Project
  • LIBR 180 Spring 2003
  • Ralph Huntzinger
  • Cheryl Lulendo
  • Jayne Ahrens
  • Charu Saini
  • Jodi Walker

2
History Digital Camera TimelineBeginning 1995
3
Through 2003
4
Link to Digital Camera Timeline
  • http//inventors.about.com/gi/dynamic/offsite.htm?
    sitehttp//www.dpreview.com/reviews/
  • http//www.digicamhistory.com

5
The Mechanics of the Camera
6
TechnologyDigital VS. Analog
  • The analog video camera "sees" light and "hears"
    sound waves, then converts the waves' variations
    into electrical signals representing light and
    dark, silence and sound. Electrical interference
    can distort the sound and light information as it
    moves through the camera.
  • Analog information "fades" with each copy -- the
    copying process doesn't reproduce the original
    signal exactly.
  • Digital is precise. It translates analog
    information into bytes of data thats written in
    the binary language of ones and zeros. There are
    no variations or in-betweens with ones or zeros
    like with analog waves.
  • Unless the camera makes a computational error,
    there's no place for signal degradation.
  • Digital video data can be loaded onto computers,
    edited, copied, e-mailed and manipulated. Digital
    cameras can be directly connected to a computer
    to download videos for editing or Internet use.

7
Basic Elements of CameraThe lens, the camera
itself and the viewfinder
8
The Imaging DeviceThe video camera translates
the image seen through the lens into a picture on
the screen. Light reflected off an object is
transmitted by the lens to a beam splitter,
splitting the white light into red, green and
blue light beams. These beams are transformed by
CCDs (a charge coupled device or chip) into
electric energy, which is amplified, processed
and reconverted into video pictures by the
viewfinder.
9
The Prism Block
  • The prism block contains the prisms and filters
    that split the incoming light images produced by
    the lens into the three light primaries (blue,
    red, green) directing them to their corresponding
    CCDs.

10
The Charged-Couple Device or Chip
  • The CCD is the imaging device or pickup device
    inside the camera that changes light into
    electric energy.
  • Its a small solid-state silicon chip containing
    rows of thousands of light sensing picture
    elements called pixels.
  • Each pixel translates the light energy it
    receives into an electric charge.

11
Pixels
  • Pixels are a lot like tiles in a mosaic. The more
    pixels in a picture area the sharper the image.
  • The more pixels in a CCD, the sharper the screen
    image. A high-resolution chip has a lot of pixels
    and produces a sharper image.
  • Think of laying two tile floors, one with large
    tiles and one with small. The one with small
    tiles will have sharper curves and more detail.

12
This is not a pixel
13
The Lens Autofocus Mechanism
  • When recording a video you need to focus light
    onto the CCD, using a lens.
  • Digital camcorders come with an autofocus, an
    infrared beam that bounces off objects in the
    center of the frame, then come back to a sensor
    on the camera.
  • The camera has a small motor that moves the lens,
    focusing it on objects.
  • The camera automatically adjusts for different
    levels of light.
  • The CCD detects when an image is over or
    underexposed because there isn't much variation
    in the electrical charges. It monitors the
    charges and adjusts the camera's lens to let more
    or less light through, maintaining a good
    contrast between dark and light.

14
Formats Film VS. Video
  • Film records visual information with chemical
    reactions.
  • Video records and stores visual information as an
    electronic signal.
  • Film and video have different technical
    properties.
  • Filmed movies need to be reorganized into a video
    format before the movie can be shown on a
    television.

15
Video Recording
  • MiniDV are lightweight, compact cameras. They
    record on compact cassettes, which hold 60 to 90
    minutes of footage. The video has a high
    resolution, giving a sharper image and can easily
    be transferred to a personal computer.
  • Digital8 cameras are similar to DV camcorders,
    but use standard Hi-8mm tapes, which hold up to
    60 minutes of footage. The videos can be copied
    without any loss in quality. Digital8 cameras a
    bit larger than DV camcorders.
  • DVD camcorders burn video information directly
    onto discs. Each recording session is recorded as
    an individual track, like individual songs on a
    CD. You dont need to rewind or fast-foward and
    can jump immediately to each section of the
    video.

16
Digital Camera Purchase
  • Costs
  • Features
  • Brand Comparisons

17
About Digital Video Cameras
  • One in seven Americans
  • Digital camera sales have risen by 30 in 2003
    from 2002
  • No film necessary
  • 40 to 60 more photographs than conventional
    cameras
  • Images stored in camera or on computer
  • Software to improve pictures

18
Pre-Purchase Considerations
  • Size, weight and feel of the camera
  • How comfortable is it to use?
  • Methods of taking excellent pictures
  • Preventing ruined pictures

19
General Features
  • Resolution
  • Viewfinder and Display
  • Focus
  • Picture Storage
  • Batteries

20
Additional Features
  • Interface
  • Video-Output
  • Zoom
  • Macro Mode
  • Ergonomics
  • Compatibility
  • Software

21
Advanced Features
  • Time Lag
  • Burst Mode
  • Sensitivity
  • Manual Controls
  • Exposure Compensation
  • Self-Timer
  • External Flash
  • Annotation
  • Lenses and Effects
  • Image Effects
  • Time Lapse and Video
  • Laptop PC Card Adapter
  • Tripod

22
Whats Available?
  • Kodak, Nikon, Olympus and Sony
  • Agfa, Canon, Casio, Contax, Epson, Fujifilm, HP
    (Hewlett Packard), JVC, Konica, Kyocera, Lieca,
    Minolta, Panasonic, Pentax, Ricoh, Samsung,
    Sanyon, Sigma and Toshiba

23
Comparisons
  • Performance Differences
  • Pixels
  • Image-handling software
  • Price
  • The price range for cameras is arranged by the
    number of megapixels and is arranged from
    excellent camera to the poorest camera.

24
Useful Web Sites
  • http//www.mysimon.com
  • http//macworld.pricegrabber.com
  • http//osdn.pricegrabber.com
  • http//www.pricescan.com
  • http//shopper.cnet.com
  • http//www.consumerreports.org

25
Stores, Catalogs Magazines
  • Kits Camera, Good Guys, Kens Camera, Talls
    Camera, Best Buys, Camera West and Comp USA.
  • Mac Mall, PC Mall, Crutchfield
  • Popular Photography, Consumer Reports (November
    2002)

26
What kind of photographer are you - casual
snap-shooter or advanced amateur?
Recommendations
  • Choose a camera that is based on the kind of
    photographer you are
  • Best model is the 2 megapixel
  • The 1 megapixel is fine for some things
  • The 3 megapixel only gives you a certain amount
    of breathing room
  • The 4-6 megapixels models for professionals and
    people with lots of money

27
Using Digital Video Technology in a Public
Library
28
Reasons to make a Public Library Video
29
A training tool for employees
  • Policies
  • Operation of Equipment
  • Procedures
  • Location of Facilities
  • Safety

30
An educational tool for patronsCould run on a
continuous video loop
  • Library Schedules
  • Areas of Interest
  • Circulation Procedures
  • Reference Assistance
  • Public Facilities
  • Public Service Announcements
  • Childrens Summer Programs
  • School year homework tutorials
  • Upcoming Community Events
  • Community Job Fairs

31
An educational tool for patrons,continued
  • Library featured Authors of the Month
  • Monthly Graphic Artists Display, such as Monet
    Day, Bergsma Art Collections, etc.
  • Community Theater Productions
  • Local Business closures or openings
  • Flea Markets
  • Local School Events
  • Community Fairs

32
Think of your community
  • Once word is out that the communitys Public
    Library has presentation technology available,
    any organization could feature their video wares,
    such as the local Historical Society, National
    Audubon Chapter, Quilt Guild, Flower Clubs, or
    any Non-Profit Organization.
  • What a wonderful service to provide!

33
Videos Provide a Nice Change
  • Any of these graphic display ideas, either in the
    form of movies, fade in/out, or loops could be
    narrated with additional information and/or music
    editing.
  • Can you think of other potential advertising
    ideas?

34
Bibliography
  • Zettl, Herbert. 2001 Video Basics 3 p. 60, 66,
    color plate A Wadsworth/Thomas, Learning Belmont,
    CA
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