Sensoray 817 - Manual (Page 5)

5
Introduction
Model 817 is a video capture board designed to be used in applications requiring high
capture rate from multiple input video channels. It is capable of capturing full resolution
color JPEG-compressed images from 16 channels at full NTSC or PAL frame rates
1 .
Along with JPEG images model 817 can capture monochrome uncompressed images
(bitmaps) which could be used for monitoring and/or motion detection. The board
provides complete capture flexibility: all capture parameters can be set independently
for each capture channel. Individual frame capture rates can be set for JPEGs and
bitmaps for each channel. All capture options are discussed in more detail in the
Software Reference.
An optional single line text caption (up to 80 characters) can be overlaid on captured
image (before compression).
A 16x4 analog crosspoint video switch is used to route any combination of four input
channels to external video monitors. Each of the four video outputs can be individually
turned on or off, which allows connecting the outputs of multiple 817’s to the same
monitor.
Model 817 implements a single-lane (x1) PCI Express interface. It can be plugged
into a PCI Express slot of any width.
1 Actual capture rate depends on the application software and operating system
performance. The application software must empty the capture buffers promptly.
Momentary “distractions” of the host computer can cause occasional frame loss, so the
resulting capture rate is usually very close, but strictly speaking, slightly lower than full.
Usually this difference is not more than a fraction of a percent.