Axis Communications AXIS 2420 user manual Exposure Control Overview, Other Advanced Parameters

58 Lenses and Advanced Focusing AXIS 2420 User’s Manual

Exposure Control Overview

The table below provides a summary of the Exposure Control settings in the Image - Advanced page. Select the parameters for your lens type and product application.

Lens Options	Description
DC-Iris	The DC-Iris setting is the standard factory default setting found on the Image-Advanced page. It allows
	the user to manually specify the exposure, shutter speed, gain, and ALC levels.
Non-DC-Iris - Manual	Choose this setting if you have fitted a non-DC-Iris lens to your AXIS 2420, but wish to adjust the
	shutter speed and gain manually.
Non-DC-Iris - Shutter	Choose this setting if you have fitted a non-DC-Iris lens to your AXIS 2420 but wish to adjust the
	shutter speed manually.
Non-DC-Iris - Auto	Choose this setting if you have fitted a non-DC-Iris lens to your AXIS 2420 and would like the shutter
	speed and gain to be adjusted automatically.
Other Advanced Parameters
Lens Options	Description
Shutter Speed	Derived from the shutter speed on a normal camera, this parameter defines the exposure period for each
	image. Use a high shutter speed only if your image subject is expected to be moving quickly; otherwise, a
	slower speed will normally suffice.
Sharpness	Defines a level of differentiation between light and dark areas within the image. Corresponding higher lev-
	els of sharpness provide for sharper images, but also cause the image compression to be more complex.
	Consequently, the file size of a sharp image can be significantly greater than an image that is less sharp.
Gain	Adjust the gain to suit the average level of light at your point of installation. The AXIS 2420 should be set to
	a corresponding higher level of Gain if your camera is normally monitoring an area at night, or is situated in
	a dark room or cupboard.
ALC Level	This defines how acutely the lens reacts to a single light source within the image. For example, with the ALC
	level set at a higher level, the headlights from a car will generally cause the calculated average level of light
	to increase, and subsequently result in a compensated image that is usually much darker.
	Adjusting the ALC to a lower level reduces the sensitivity of the lens to single light sources within the
	image.