The size of the image files created by the camera depends on the degree of com-
pression, among other things. Compression can be defined as a percentage value
set by the JPEG
Quality parameter. Using a compression of
60%
will usually deliver
good-quality images for most purposes. If the value is lower than
20%
, you can see
tiles within the image. For a value higher than
70%
, differences to the uncom-
pressed original image are hardly visible. The file size, however, may increase to
more than 100 kB for a 640x480 (VGA) image.
The example image (in 80% and 20% compression) and the table will give you an
idea of the approximate file sizes and the corresponding image quality. Note that
the file size also depends on the scene itself and that it increases with the number
of details displayed in the image. Thus, the table shown only contains approximate
file size values.
© MOBOTIX AG • Security-Vision-Systems • Made in Germany
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Software Camera Manual Part 2
Average image sizes of
JPEG images
Note
The MxPEG setting reduces the speed of the exposure control. We
therefore recommend the JPEG setting for all applications that are
not dependent on high frame rates.
Note
Regardless of the chosen format, the live image is displayed in every
web browser. If a browser does not support MxPEG (or if ActiveX has
not been installed), the camera automatically switches to JPEG.
Moreover, the camera can continue storing images in JPEG format
(e.g. on a web server using FTP) even though it is running in MxPEG
mode.
JPEG-Quality 160x120
PDA
320x240
CIF
640x480
VGA
1280x960
MEGA
20% (low)
40% (medium)
5 kB
6 kB
10 kB
15 kB
20 kB
31 kB
56 kB
90 kB
60% (high)
80% (highest)
8 kB
10 kB
19 kB
30 kB
41 kB
64 kB
136 kB
213 kB
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