(Gv ipcamh264)light flicker-issue

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The document discusses a light flicker issue that occurred when using older GV-IPCAM cameras with fluorescent lighting and electromagnetic ballasts. Under these conditions, the visible light would flicker at 50-60 Hz. This was caused by the old-style electromagnetic ballasts generating flickers at the line frequency. The issue was resolved in firmware version 1.02, which eliminated the flicker problem when used with fluorescent lighting.

Technology

Light Flicker Issue

Article ID: GV15-10-04-06
Release Date: 2010/04/06

Applied to
GV-IPCAM H.264 firmware version 1.01 or earlier

Symptom
When the VGA or CIF resolution was applied under fluorescent lamps with old-type
inexpensive ballasts, the visible light flicker occurred.

In the following example, we used a white color paper to reveal the light flicker. See the pale
yellow lines on the paper.

GeoVision Inc. 1 Revision Date: 2010/4/6

Cause
Fluorescent illumination with old-type electromagnetic ballasts can generate visible light
flickers at the line of frequency 50 to 60 Hz.

The flicker problem is known with electromagnetic ballasts. For details, you can refer to
Fluorescent lamp (section Flicker Problems) in Wikipedia Encyclopedia.

Resolution
The flicker problem has been resolved completely in GV-IPCAM H.264 firmware version
1.02.

The download link of GV-IPCAM H.264 firmware 1.02: Download

GeoVision Inc. 2 Revision Date: 2010/4/6

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