Strange Effect On CCTV Video - What Is The Cause?

Rukmini Wilson

04/20/14 04:04am

It seems where the picture gets overexposed instead of being white it goes black. Or is something else happening? Warning: Brutal karate kick inside!

Undisclosed #1

04/20/14 02:22pm

It's over-exposure compensation. I've seen several cameras do that where a really bright area actually gets displayed as black pixels.

Richard Handy

In reply to Undisclosed #1 | 04/20/14 03:28pm

Do they do that on purpose? To make it more contrasting maybe?

Avatar

Vincent Tong

04/21/14 03:41pm

It seems that the cameras have HLC (High Light Compensation) on in the camera. That is why you see the really bright areas , especially the whites get blackend out.

Rukmini Wilson

In reply to Vincent Tong | 04/21/14 04:09pm

Is that a generic term, HLC, or specific to a manufacturer? Is it designed really just as a 'clip indicator' (like the red of a audio VU meter) and so you should never see more than just a small amount of blackening, or is the way the video clip looks typical?

Avatar

Vincent Tong

In reply to Rukmini Wilson | 04/21/14 04:14pm

No that is pretty generic among camera features. You would see it more pronounced when looking at something like car headlights at night.

John Honovich

IPVM | In reply to Vincent Tong | 04/21/14 04:26pm

Thanks Vincent!

Here's a marketing demo video that shows highlight compensation in action:

Top Comment Votes - Past 3 Months
  • 1. John Honovich - 1790
  • 2. Brian Karas - 977
  • 3. Sean Nelson - 734
  • 4. Chris Dearing - 495
  • 5. Shannon Davis - 369
  • 6. Michael Miller - 324
  • 7. Marty Major - 256
  • 8. Jonathan de Chateau - 198
  • 9. Sean Patton - 167
  • 10. Clint Hays - 152
  • 11. Tim Pickles - 147
  • 12. Brian Rhodes - 144
  • 13. Jay Hobdy - 136
  • 14. Jon Dillabaugh - 132
  • 15. Ethan Ace - 127
  • 16. Ari Erenthal - 111
  • 17. David Delepine - 111
  • 18. Greg Cortina - 102
  • 19. Ross Vander Klok - 94
  • 20. Rich Moore - 82
Manufacturers
Tools

BestMatch

Camera Calculator

Camera Finder

F-Stop Calculator

Chat

Integrator Finder

News Spider

Camera Comparison

Quizzes

Pages

About

Contact