Mark Dammer MM0DQMThese tests use background patterns on a screen instead of a printed moire. The idea is to be able to project the pattern on a screen or wall for larger scale schlieren videography.
On top the test setup with a stripe pattern on the external screen an a Logitech c930e camera.
In the first video a stripe pattern similar to the printed moire patterns is used:
This video is an attempt to get a better image by using a chequerboard pattern:
Discussions
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What are the chances that this could work with real world backgrounds?
I know that moving scenery would ruin the effect, but I wonder if there's some way of processing it, still. Perhaps with two camera to identify and filter out the background somehow.
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Real world backgrounds can work if they offer enough contrast. It's definitely worth experimenting! The main problem is that the signal - the very small changes in light intensity caused by the schlieren effect - is very small compared to the "noise" in the form of movement etc.
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Part of the reason I ask is because that technique would be pretty fantastic for paragliding. Finding thermals is difficult, mostly done with educated guesses and following birds, but a thermal air camera? Amazing.
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Earlier I tried a version, which could work outside, as reference-image I used the last one taken, it was not that great, but worked. I think that can work.
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