Lenses for network video cameras

Benefits of an i-CS lens

Electronic Image Stabilization (EIS)

To stabilize the image, the camera reads certain information from the lens. The illustration below shows the controls for EIS in the graphical user interface (GUI) of the camera when not using an i-CS lens. For EIS to work properly, it is important that the focal length of the lens be correctly set, which can be tricky.

EIS settings on a lens not equipped with i-CS lens features.

Figure 8: EIS settings on a lens not equipped with i-CS lens features.

A camera with an i-CS lens however, eliminates the need for manual setting, as it can read the focal length directly from the lens. Fewer settings are required in this case.

Fewer EIS settings when using an i-CS len

Figure 9: Fewer EIS settings when using an i-CS lens.

See also the video clip on EIS available at www.axis.com/products-and-solutions/technologies/Intelligent-cs-mount-lens

Barrel distortion correction

As there is no such thing as a perfect lens, each lens will present some form of aberration or defect due to various limitations. These aberrations include barrel distortion, in which the image of a square object has sides that curve out. Since the i-CS lens contains information about its own geometrical distortion, the camera can use this information to correct the distortion.