3 ms·
> Supposedly the key to this is the fact that intensity is proportional to 1/distance^2, but just how they use this (given that different objects will be differ
by wendroid 16y ago
> Supposedly the key to this is the fact that intensity is proportional to 1/distance^2, but just how they use this (given that different objects will be different in brightness) the article doesn't say.
I'd imagine something not far away from :
pixel(x, y) = max(intensity(x, y, ccds))
The IR distance system has been around for a while. Sony released a camera which recorded the distance per pixel too, they introduced it as an alternative to green screening, using the distance map as a matte. I can't find what that's called atm. and though I looked forward to using one, I've never come across one in my film work.
- gjm11 16y agoNo, not that (unless I'm misunderstanding you, which of course I might be). Here's what they do, according to the PDF that I linked to: 1. Illuminate with two IR sources, more or less on-axis and at known positions relative to the lens. 2. From the ratio of the resulting pixel intensities, estimate per-pixel distances. 3. Take each pixel from the image whose camera is focused nearest to that pixel's distance.
- wendroid 16y agoAh right. I realised in bed that what I guessed was totally wrong