Security And Presence; Figure 5-10 Using Low Resolution (160 X 120, Ntsc) To Show Presence - Honeywell Rapid Eye System Administration Manual

Security and Presence

Document 800-07769 Rev A
02/11
Before critical events occur, it is worthwhile to compare video recorded at Continuous
settings with video recorded using Event settings. You can then establish if the resolution
is high enough for your organization's security needs. Consult your security personnel to
decide whether you need to establish the presence of known individuals. Lower resolutions
are usually adequate and take less storage. Samples of low-resolution and high-resolution
video images are shown in
Video images are bitmaps. When a camera window is dragged to a larger size, the pixels
are also enlarged. The image's sharpness is not preserved. More stretching can degrade
the subject of an image beyond recognition. Compare
resolution (704 × 480, NTSC) shows recognizable facial characteristics and very few
artifacts, such as pixelation, color variance and so on. If storage time is an issue, recordings
at a more modest resolution (320 × 240) shows almost as much detail. Applications to
establish presence or absence of personnel can use even lower resolutions. At 160 x 120
(NTSC) many facial characteristics of a known person are still recognizable even when the
imaged is stretched, as in
Figure 5-10 Using Low Resolution (160 x 120, NTSC) to Show Presence
Detail of recorded video,
previewed at a resolution of
160 x 120 and stretched
beyond recognition.
Preview window
Same detail of recorded video,
not stretched, printed life-size.
Some facial characteristics are
recognizable.
Retouching Still Images
Bitmap editing tools and imaging software can be used to enhance video stills or screen
captures. Although retouching may void the video as admissible evidence in a court of law,
it can be of use to highlight a detail or trait. Commercial software for retouching bitmaps
includes: Paint-Shop Pro, Corel Photopaint, Adobe Photoshop, and others. For screen
captures, use Microsoft Windows, TechSmith's SnagIt, and so on.
Screen Area: Size of Camera Windows on a PC Monitor
Adjusting Microsoft Windows Display Properties for a PC monitor can have an effect on how
resolution is perceived. See
Rapid Eye DVR System Administrator Guide
Comparing the Resolutions of Recorded Video
Figure 5-10.
Monitor Settings to Customize Windows for a PC
on page 86.
and 5-10. A high
Figure 5-9 Figure
on page 90.
87