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Chapter 2
16
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; this is fixed at 0 on the DT3155 board. The left side of the
frame is the first pixel of video relative to the active video area; this is
fixed at 0 on the DT3155 board.
The width of the frame is the number of pixels per line of video; this
is fixed at 768 for 50 Hz and 640 for 60 Hz on the DT3155 board. The
height of the frame is the number of lines per field; this is fixed at 576
for 50 Hz and 480 for 60 Hz on the DT3155 board.
illustrates these relationships.
Summary of Contents for DT3155
Page 1: ...DT3155 UM 13856 K User s Manual ...
Page 4: ......
Page 8: ...Contents viii ...
Page 16: ...About this Manual xvi ...
Page 17: ...1 1 Overview Features 2 Supported Software 3 Accessories 4 ...
Page 62: ...Chapter 3 46 ...
Page 86: ...Chapter 4 70 ...
Page 97: ...81 A Specifications ...
Page 100: ...Appendix A 84 ...
Page 101: ...85 B Connector Pin Assignments Video Input Connector J1 86 Video Coaxial Connector J2 88 ...
Page 122: ...Appendix C 106 ...
Page 132: ...Index 116 ...
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