Axis 2100 User Manual page 13

AXIS 2100 User's Guide
Picture frequency for Networking Applications
When used in a TCP/IP networking environment, the AXIS 2100 delivers up to 10 images/second;
where the actual image frequency is typically limited by:
• your Web browser/computer
• the image size
• the lighting conditions at the point of installation.
• the available network bandwidth
• complexity of detail and color variation within the image
Image Compression Ratios
The file size of a JPEG-compressed image depends upon the actual content of the image. Images
containing a lot of detail will generate larger files. Image quality is controlled by the level of
compression; high compression yields small files, while low compression maintains higher image
quality at the expense of larger files. The table below contains average file sizes in kilobytes, derived
from real-life tests:
Resolution
640 x 480
320 x 240
Note:
Using a modern computer will avoid introducing any unnecessary bottleneck when viewing the
images.
Lighting Conditions
Just like any camera, the shutter time of the AXIS 2100
increases in low light conditions to guarantee optimal
image quality.
The actual frame rate for your images is affected by the
prevailing light conditions in your application
environment. Although the AXIS 2100 will produce good
quality images right down to 3 Lux, local lighting should
ideally be stable at 40 Lux or more to achieve optimal
image frequency. Consequently, you can expect a reduced
frame rate under low light conditions in your application
environment, as shown in the diagram (right).
Typical File Sizes (kbytes)
At lowest At low
compression compression
250 kb 20 kb
70 kb 8 kb
Choosing Your Application
At medium At high
compression compression
13 kb 8 kb
5 kb 3 kb
Images / sec.
10
2
3
11
Lux
40