Pelco Developer Network (PDN)

LensControl Issues

This section contains special issues related to the LensControl service.

Issues

Centre weighted average

In most modern cameras, the default system settings (when auto-iris, auto-focus, and other auto-configuration features are on) are a 'centre weighted average', meaning that although the settings take an average reading of a whole scene, more emphasis is placed in the middle of the frame. Consequently image detail will be lost for areas surrounding the center

Stopping changes to focus

If you do not make an explicit request to make the camera focus in or out, the camera will continue to either focus in or out (or more specifically keep trying to focus in or out even though it is at focus limit) until you make a specific request to stop.

Stopping iris control

If you do not make an explicit request to make the camera open or clos the iris, the camera will continue to either move open or close the iris (or more specifically keep trying to open or close it even though the iris is already completely open or closed) until you make a specific request to stop.

LensControl actions supported by camera model and control mode

The following chart assumes that you have the latest firmware/ppm installed.
ModelControl ModeGetMag (absolute zoom)SetMag (absolute zoom)
Spectra IV IPD-ProtocolYY
Spectra IV EnduraD-Protocol (RS485)YY
Spectra IV EnduraExt-CoaxitronNY
Spectra IV EnduraD-ProtocolNY
Spectra III EnduraExt-CoaxitronNN
Spectra Mini EnduraD-Protocol (4 Wire RS422)NY
Spectra Mini EnduraExt-CoaxitronNY