3 ms·
The instantaneous "HDR" capability of biological eyes is really quite amazing. About 5 orders of magnitude for human eyes, about 2-3 for most cameras. By the w
by ahartmetz 2y ago
The instantaneous "HDR" capability of biological eyes is really quite amazing. About 5 orders of magnitude for human eyes, about 2-3 for most cameras.
By the way, there's a really cool in its simplicity medium term adaptation mechanism in eyes as well, they measure light intensity by photo-decay of a chemical substance that is produced slowly. If there is much light, the substance decays a short time after production. If there is little light, it accumulates for about half a minute, massively increasing sensitivity. The quantum efficiency (the inverse of how many photons it takes to produce a signal) of a dark-adapted eye is about 0.3: https://www.nature.com/articles/ncomms12172#MOESM482 https://www.nature.com/articles/ncomms12172#MOESM482
- andix 2y agoIs the 2-3 just for single frames, or does it already include all the tricks cameras can do to get more dynamic range? Many cars have multiple cameras and could (can?) run them at different exposures. Or run at a very high frame rate and take every frame with multiple exposure settings, and calculate an HDR video on the fly.
- ahartmetz 2y ago2-3 would be single frame / without special tricks to increase dynamic range.
- PaulHoule 2y agoEyes have two kinds of "pixels" https://my.clevelandclinic.org/health/body/photoreceptors-rods-and-cones https://my.clevelandclinic.org/health/body/photoreceptors-ro... I know my Sony camera has pixels that, collectively, can be attached or not attached to a capacitor that reduces the sensitivity https://www.photonstophotos.net/Aptina/DR-Pix_WhitePaper.pdf https://www.photonstophotos.net/Aptina/DR-Pix_WhitePaper.pdf I wonder if you could have a matrix of high and low sensitivity pixels that would give a camera more headroom.