Viewing profile — lcrs

There are a few projects now that simulate defocus properly to match what bigger (non-phone camera) lenses do - I hope to get back to working on it this summer but you can see some…

If you're interested in the equivalent of "backprop through zemax" there are a few projects going on to jointly optimize optical designs with the image processing, e.g. check out: …

I've been working on something similar, although I'm more interested in replicating the effects of existing lenses than designing new ones: https://x.com/dearlensform/status/185822…

Colour in the Photoshop/gamedev world is often handled pretty casually, but if you're interested the moving picture world gets a lot more rigorous about it and there's tons of docu…

I've worked on a few bloody moments in film VFX and we certainly looked at some horrible reference of wounds, including headshots from pathology reports. I don't think I suffered m…

A lot of that group's publications are listed here, many involving optical flow: http://web.archive.org/web/20161014025823/http://gpu4vision.... Maybe this one from 2007: https://w…

I'm actually not sure much ML was involved here - depends where you draw the line I guess, but denoising and interpolation for restoration typically use more traditional wavelet an…

Perceptual uniformity is in some ways opposite to the linearization suggested above - the L* component of CIELAB is much more like the gamma-encoded values of sRGB than a linear li…

Digital cinema uses wavelet compression - intra-frame only JPEG2000 at hundreds of Mbps. It seems that at high resolution and bitrate it actually performs similarly to or better th…

That's exactly how it's normally done - the offline editor works with low bitrate HD files, then gives the edit list to the online team who re-conform from the full resolution stuf…

Shamefully I can't remember which wahwah I used - I was treating the audio with both Audacity and Pro Tools as well as sox though...

Similar results - converting to a square image at 8bit then lowering JPEG quality just gets noisy in an uninteresting way: sox mo.wav -e unsigned -b 8 -c 1 -r 48k mo.raw bytes=`sta…

Nice script :) I did a similar thing by hand with graphicsmagick and sox a couple years ago - the most fun result was from wahwah, pretty much a wide bandpass filter with centre fr…

Strikingly similar to the low-discrepancy sequences used as sampling patterns in modern ray tracers - and quite a similar role, really: https://en.wikipedia.org/wiki/Halton_sequenc…

The IE11 result makes me weep here, given the popularity of it - thanks for doing these tests. The amount of work we put into maintaining correct colour through the production chai…

Correct! But for wider gamuts (and higher-contrast displays), the benefit becomes more obvious in the lack of banding.

This is kinda happening - the "UHD Alliance Premium Certified" spec for TVs mandates 10-bit from the input to the panel. It's a shame the UHD Blu-ray standard doesn't mandate 10-bi…

The antialiasing linear vs. gamma debate is an interesting one - check out this conversation, wherein nobody could figure out a reasoned method other than "sometimes AA in sRGB loo…

10-bit with a log or gamma encoding is widespread in film and video work, and I've never known a banding problem, even with purely generated gradients. The Rec. 2020 UHD standard d…

Shake is more complete than Natron still - and some parts of Shake are still world class, the spline-based warping for example is still on par with Nuke and Flame, and the included…

I was always curious how much use that Spirit support saw - it must have been a ton of work, but it seemed like it was added just at the precise moment when everyone switched from …

I occasionally see Spirit 2k's destined for the dump and wonder what would be entailed in running one. Since they were a little notorious for poor frame-to-frame registration I won…

I'm interested to know how they're interfacing with the Adobe apps. I hooked up trackballs to Levels in Photoshop using the official "Connection SDK" a couple of years ago and the …

With modern film stocks and scanners Super8 can look remarkably good. It'll be interesting to see how Kodak's scanning service compares to scans like these, both of which were shot…

I can't imagine btdigg can scrape the whole DHT, but I think the idea is that the traffic they see by running many "fake" nodes is proportional to the whole, because the DHT spread…