Data Translation DT3152-LS, User Manual

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Chapter 2
40
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 5: Vertical Input Settings (Area-Scan Mode Onl y)
Setting Description Range
Nominal
Values
First Active Line The position of the first active
video signal within the field,
as a line offset from the
beginning of the vertical sync. 0 to 4095
a
lines
a. The granularity is 1.
50 Hz: 20
60 Hz: 16
Active Line Count The number of lines per field
(or noninterlaced frame) in the
active video area. 1 to 4096
a
lines
50 Hz: 288
60 Hz: 240