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Dual PAL video input -> cropped, split output

It sounds like what you really want is to be able to read the video streams into a pair of frame buffers so you can sync them up, then read them out as described -- the nice thing about using the frame buffers is you no longer need to be genlocked, but you can get into some serious work to make it happen.

If you haven't already try searching for "video effects".

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Tim Wescott
Wescott Design Services
http://www.wescottdesign.com
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Tim Wescott
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I read in sci.electronics.design that Quack wrote (in ) about 'Dual PAL video input

-> cropped, split output', on Mon, 3 Jan 2005:

To make a horizontal split, you need a video switch, toggled at twice the field rate, i.e. at 100 Hz for PAL. This is not very difficult. But if the video streams are out of sync, you need a genlock as well, and that is more ambitious.

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Regards, John Woodgate, OOO - Own Opinions Only. 
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Reply to
John Woodgate

Hi,

I am trying to find (or make if i can find the right chips to make it simple enough) a device that will take 2 out of sync PAL video inputs and create a single PAL output comprised of both signals split horizontally (in a cropped fashion, not squashed).

Without going into too much detail, there is no way around it, vertical splitting or 'squashed video' is not an option. This is for a very specific purpose.

I have tried googling around but i cant find what im looking for, but i could be using the wrong terminology. Perhaps its a simple normal thing to want to do.

Any hints anyone ?

Thanks! Alex.

Reply to
Quack

Yes i considered this, but i cant guarantee the cameras will be insync. I have all parts for this already and could knock it out quickly.

The 'genlock' you mention, this would be a function of the cameras as i understand it, and not of the 'device in the middle' ? As a compromise we could have the cameras in-sync as a requirement, but this is not the ideal solution :(

Thanks Alex.

Reply to
Quack

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