Reduction of speckles - Githubissues

NebraLtd / AnyBeam

Resources for the Nebra AnyBeam laser pico projectors

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Reduction of speckles #7

Open ehoef opened 3 years ago

ehoef commented 3 years ago

Hi, Love the projector and want to use it for an upcoming art exhibit. The animation has a white background with tiny black figures. Is it possible to reduce speckles and increase contrast (sharpness) - See image attached on how if currently looks. I have the brightness all the way down. Any help appreciated.

Best, eHoef

MoorPoor commented 3 years ago

Hei eHoef I`m not sure about those speckel-noise but it looks like you should try to readjust the green and blue as they seem to be offset?! I assume you checked the sharpness menu-option already? how far is the distance between projector and screen? I also unfortunately can not get a really sharp image from a certain distance. As the box is white you get a lot of reflections and scattered light... that also kills the contrast. good luck with the exhibition.

ryanteck commented 3 years ago

The speckle effect is rather hard to reduce and is a quirk of it being a laser projector.

Our primary recommendation is to try a projector screen material as some of these reduce the effect significantly.

you can adjust the sharpness in the OSD, are you using the HAT, developer kit or standalone?

ehoef commented 3 years ago

Thanks all for you excellent comments. I am using the developer kit projecting from a RPI.

The projector is about 16 inches from the surface, might be too close by
Did tinker with the green/blue adjustments as well as sharpness. Distance probably mostly the culprit as well as the surface
Have not tried projector screen material yet, it really is a tiny box, so not sure where I can get screen material in small quantities. Something to look into as well.

ryanteck commented 3 years ago

Hi @ehoef ,

You might find a just a thin white fabric will work in place of "proper" projector screen material and is potentially something I'd try first as it can be easier to get hold of.