Principles of Operation
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Image Acquisition
This section describes the following topics related to image
acquisition:
• Fields and frames,
• Acquisition modes,
• Data transfer and storage, and
• Overlays.
Fields and Frames
You can use software to specify whether to acquire fields or frames of
video information. A field is defined as the number of lines between
two consecutive vertical sync signals. It can be an even field,
consisting of lines 0, 2, 4, and so on, or an odd field, consisting of lines
1, 3, 5, and so on. A frame can be either interlaced or progressive
(noninterlaced), defined as follows:
• Interlaced frame
−
Consists of two consecutive fields, each
containing the number of lines per field in the active video area
(see
for more information). An even and an odd field are
acquired to create the complete frame.
• Progressive (noninterlaced) frame
−
Consists of a single field,
containing the number of lines in the progressive frame of the
active video area.
Through software, you can specify which of the following
fields/frames to acquire:
• Even fields only,
• Odd fields only,
• Interlaced frames, or
• Progressive frames.
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