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First Active Pixel
Frame Left
First Active
Line
Frame
Top
Active Pixel Count
Figure 4: Spatial Relationship of Video Signal
Types of Frames
The DT3120 board can acquire interlaced frames.
The video signal is defined as two consecutive fields, where the start
of each field is identified by the falling edge of the vertical sync.
These two fields are acquired to create the complete frame. The even
field contains lines 0, 2, 4, and so on; the odd field contains lines 1, 3,
5, and so on.
Using software, you can select one of the following types of frame
acquisitions:
• Interlaced frames, starting on the next even field (the default),
• Interlaced frames, starting on the next odd field,
Total Video Area
Active Video Area
Frame
Frame Width
Total Pixels per Line
Principles of Operation
Active
Frame
Line
Height
Count
2
2
Total Lines
per Field
2
2
2
2
2
2
2
17
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