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?

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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?

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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:

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