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Many
of the newer digital still cameras include a port and a cable that
can connect to the RCA jack on television monitors. This allows
the presenter to show the images directly on a large screen display
without ever having to pass the image through the computer. Some
cameras have a "slide show" option, where the camera will
show individual pictures advancing at a specific time increment,
or by the touch of a button on the camera. This may be a cost and
time efficient way to display graphics or images for instruction
in a classroom.
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Appearance
of Images on Monitor
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This
movie shows an image change on a television monitor from a Hewlett
Packard camera. Notice how the television monitor displays a scan
line from top to bottom as the image decompresses and loads.
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This
second movie shows a Kodak camera. When the image first appears,
it has a fuzzy appearance. The camera then makes a second scan which
allows the viewers watching the TV monitor to see the image clearly.
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This
final movie shows the transition for a Sony Cybershot camera. Notice
that the images appear without multiple scans or scan lines.
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Using
Digital Still Cameras to Display Live Action
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Another
use of this connection is to switch the camera from the player mode
to the camera mode. Anything the camera detects is then shown on
the monitor, projection device or other RCA connector input video
device including video cassette recorders. For example, suppose
you would like to do a demonstration in front of the class, but
the apparatus is too small. Use the digital camera. Or suppose you
would like to display some images from a book, or some exceptional
student work: just point the camera at the objects for a true "desktop"
presentation. Carlos shows an example of a use of this technique
in the image below. He is using the macro capability of a Sony Cybershot
digital still camera to display the parts of a flower.
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Not
all digital still cameras allow you to display "live"
images from the cameras to monitors. At this time, we have found
the Sony cameras to be best for this purpose. If the cameras have
"macro"capabilities, you can magnify small objects by
placing them very close to lens of the camera, and the camera keeps
the image in focus.
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©2000-2002
Dr. John Park for Science Junction, NC State University.
All rights reserved. URL: http://www.ncsu.edu/sciencejunction/route/usetech/digitalcamera/monitor/vidoutput.html Last updated 07/25/02 | Digital Camera Characteristics | Learning to Use Technology | Teaching With Technology | |