GeoVision GV-VD120D Manuale utente

GeoVisionInc. 1 RevisionDate:11/9/2011

Solving IR Reflection and

Improving Night View

Article ID: GV15-11-11-09-c

Release Date: 11/09/2011

Applied to

Vandal Proof IP Dome

(GV-VD120D/121D/122D/123D, GV-VD220D/221D/222D/223D,

GV-VD320D/321D/322D/323D)

Fixed IP Dome (GV-FD120D/220D/320D)

Summary

If you are having difficulty getting clear live views under low light conditions with your Vandal

Proof IP Dome or the Fixed IP Dome, this is likely due to IR reflections inside the camera. To

solve the IR reflection problem, you can choose to disable the IR Light function if there is

sufficient lighting on the installation site. If you do not have enough lighting on the installation

site, proceed to identify the possible causes and adopt the solutions to reduce IR reflection

and improve the quality of live view.

GeoVisionInc. 2 RevisionDate:11/9/2011

Troubleshooting flowchart

Solving IR Reflection and Improving Night view

Without external

IR illuminator /

sufficient lights

Keep IR Light

function enabled

With external IR

illuminator /

sufficient lights

Disable IR Light

function

See

Solution 4 (page 13)

See

Solution 6 (page 22)

Is my live view foggy?

Are there round spots or

water droplets on my live

view?

Are there light spots or

glass reflection on my live

view?

YES

See

Solution 3 (page 10),

Solution 5 (page 16)

See

Solution 1 (page 5),

Solution 2 (page 8)

Is there a circle of spots

on my live view? YES

GeoVisionInc. 3 RevisionDate:11/9/2011

Disabling the IR

By default, the IR LEDs turn on when there are insufficient lights. To avoid IR reflection inside

the camera, you can disable the IR function if there are sufficient lights or an IR illuminator

installed on the installation site. The disabling the IR function is available on the camera with

firmware version 1.07 or later.

Note: The minimum amount of light (in lux) required in night mode and the corresponding

live image are detailed below.

For GV-VD120D/121D/122D/123D, GV-FD120D: approximate 4 lux.

For GV-FD220D/320D, GV-VD220D/221D/222D/223D,

GV-VD320D/321D/322D/323D: approximate 8 lux.

GeoVisionInc. 4 RevisionDate:11/9/2011

To disable the IR:

On the Web interface, select Streaming 1 under Video Settings, select Off for IR Light and

click Apply.

GeoVisionInc. 5 RevisionDate:11/9/2011

Possible Cause and Solution

If there are no sufficient sources of light, proceed to identify the causes and adopt the

suggested solution.

1. Are the screws properly tightened?

Spots in a curve

Live view with loosen screws showing spots in a curve

Vandal Proof IP Dome

(GV-VD120D/121D/122D/123D, GV-VD220D/221D/222D/223D,

GV-VD320D/321D/322D/323D)

Tightly secure the 4 screws inside the housing cover

GeoVisionInc. 6 RevisionDate:11/9/2011

Tightly secure the 4 screws on the housing cover

Fixed IP Dome (GV-FD120D/220D/320D)

Tightly secure the 4 screws inside the housing cover

GeoVisionInc. 7 RevisionDate:11/9/2011

Tightly secure the 2 screws on the housing cover

Solution:

Check the inside and outside of the housing cover and be sure the screws are properly

tightened.

GeoVisionInc. 8 RevisionDate:11/9/2011

2. Is the rubber band around the lens loosened?

The rubber band around the lens prevents IR LED light from reflecting inside the camera

cover. If your rubber band is loosened or not properly fitted, some light may reflect inside the

cover and affect the quality of the live view.

Live view with displaced rubber band showing a circle of spots

Top View: The rubber band is out of position

Side View: The rubber band is out of position.

GeoVisionInc. 9 RevisionDate:11/9/2011

Top view: The rubber band is at its normal position.

Side View: The rubber band is at its normal position.

Solution:

Check if the rubber band is properly fitted and completely attached to the camera cover when

the cover is attached. If your rubber band is still loose after your adjustment, contact the

vendor or local distributor for replacement.

GeoVisionInc. 10 RevisionDate:11/9/2011

3. Is my cover dirty?

For a foggy live view, your cover may be dirty from dusts, finger prints or debris.

Note: If your camera is installed in a dusty or moist environment, your camera may need

regular maintenance.

Live view through a dirty cover appears foggy

Cover with dusts

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