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Appendix B: Understanding VN-GLIMPSE Performance ES3610/11 User Guide
I447GB issue 6 Page 55
Understanding VN-GLIMPSE Performance
In an ideal VN-GLIMSPE system, the source seen at the viewing station should be virtually
indistinguishable from the original source. However, in certain circumstances, you may notice some
reduction in performance. The following details are intended to explain the problems you may
encounter and how to minimize or avoid them.
What are the performance criteria?
Image Refresh Rate – how often the display content is updated. Ideally this should match (or be as
close as possible to) the refresh rate of the original source. As the refresh rate decreases a loss of
smooth motion will be noticed. For example, a moving mouse cursor will appear to move smoothly at
a fast refresh rate but will appear more ‘jerky’ at slower rates.
The RGB ADAPTER features a variable source refresh/update rate. To ensure smooth motion it will
use the highest possible refresh rate. However, during periods of intense screen activity, the refresh
rate may be temporarily reduced to compensate for the higher volume of data.
Image Latency – how quickly a change in the original source takes to be seen in the viewed source.
Ideally this should be instantaneous ( i.e. in ‘real time’). In practice, there will always be some delay
introduced by the electronics and software that processes the data between the original source and
the viewing station, but this will usually be small enough to be ignored. As the latency increases a
greater ‘time lag’ will become noticeable between events happening in the original source and the
same events being seen in the viewed source.
Image Quality – the sharpness and color of the viewed source in comparison to the original. When
viewed at the same resolution as the original, there should be no discernable differences. However, if
any scaling is applied to the source (
i.e . displayed smaller or bigger than the original) there will always
be some small loss of sharpness. This is an inherent side-effect of image scaling.