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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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(Gv ipcamh264)light flicker-issue

  • 1. 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
  • 2. 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