Information Technology Reference
In-Depth Information
© iStockphoto.com/jimd_stock
Figure.3 12 The routing numbers on checks are written with
magnetic ink so they can be read by MICR machines.
Capture Devices
The scanners you have learned about so far read existing data and scan
existing photographs and documents. Image capture devices, on the
other hand, capture new content.
A capture device can capture either still images or motion video. Some
devices do both, but most are designed primarily for one type or another.
A digital camera is designed primarily for still photos, and looks much
like a film camera; a digital video camera is designed primarily for motion
video. See Figure 3.13. Both work using the same basic technology; the
digital video camera captures many frames (individual still images) per sec-
ond and stores them in a single file. When you play back the still images in
chronological order, the image appears to be moving. Digital video cam-
eras can also capture sound to accompany the video clips, which can be
played back synchronously with the images. Many modern smartphones
have built-in cameras that can take still photos and record video clips.
digital camera A camera that captures and
stores still images in digital form.
digital video camera A video camera that
captures and stores motion video in digital form.
frame A still image that makes up part of a
digital video clip.
© iStockphoto.com/Chiyacat (left), © iStockphoto.com/arsenik (right)
Figure.3 13 A digital camera (left) and a digital video camera (right).
Some digital video cameras are stand-alone; you can take them out
into the world and capture video, and then connect the video camera
to a computer to transfer, edit, and save the video clips. Other cameras
are webcams , as in Figure 3.14, which are simple video cameras that
lack their own storage and capture controls. They remain permanently
webcam A digital video camera that must remain
connected to a computer as it operates.
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