Data Translation 18729, User Manual

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Principles of Operation
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Frame (Region of Interest)
The frame is the portion of the active video area that you want to
digitize. For this reason, it is sometimes called the region of interest
(ROI).
This section describes the following aspects of frames:
• Frame size,
• Frame type,
• Scaling frames, and
• Frame storage modes.
Frame Size
The top of the frame is the first line of video relative to the active
video area. The left side of the frame is the first pixel of video relative
to the active video area. The width of the frame is the number of
pixels per line of video. The height of the frame is the number of lines
per field
.
Table 1 shows the settings you can program on the DT3120 board to
define the frame. Figure 4 illustrates these relationships.