◎Digital camera：
This allows the scanning of different sizes of
originals
◎Drum scanner：
source material is placed on a drum which is then
rotated past a high-intensity light source that captures
the image.
Drum scanners tend to offer the highest image quality,
but require flexible source material of limited size that
can be wrapped around a drum.
◎Flatbed scanner
Source material is placed flat on the glass and
captured by CCD arrays that pass below it.
Flatbed scanners require source material to be no
larger than the glass and to lie face-down and flat.
CCD Array: Charge-coupled device array.
Light-sensitive diodes used in scanners and electronic
cameras. These usually sweepacross an image and, when
exposed to light, generate a series of digital signals
that are converted into pixel values.
◎Slide scanners：
Slide scanners can generally scan only 35-mm
transparent source materials.
◎Video frame grabber：
It is attached to a standard video camera.
Anything that can be filmed by a video camera can be
digitized by a video frame-grabber, including
three-dimensional objects and motion video.
It is limited by video image quality.
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