Light sparkles probably contain randomness yes, if your image processing doesn't remove it. So for example, perhaps find a way to not discard location in the im

Light sparkles probably contain randomness yes, if your image processing doesn't remove it. So for example, perhaps find a way to not discard location in the image, timing from image to image, intensity - all of which will contain some randomness. Subject to someone learning that you are doing this and shining a light into your camera. And I don't think you need to go to any effort at all to remove the non-random part - as long as you actually do collect the random aspect. An issue with randomness is how much you are collecting. Ideally your system generates both the random numbers and an estimate of how much randomness it is collecting. Some uses require a lot, some very little.