61–70 of 98 posts
Earlier quoted context omitted.
Okay, but can’t I take 8 raw images and merge them into one image with 8 times higher dynamic range?
Yes, that's what modern cameras with the built in feature do. (although I'm not sure about 8 times) The article talks about this feature.
> No more will photographers or even ordinary people have to fumble with aperture size and exposure length. This is a "computer scientists" understanding of photography, and this phrase alone can even be seen as "dangerous" by photographers. There's more to aperture size and exposure length than "how much light reaches the sensor", like focus, depth of field, motion blur and bokeh, to name a few, that is not aknowled…
> This is a "computer scientists" understanding of photography, and this phrase alone can even be seen as "dangerous" by photographers. The actual headline of the article is actually more informative and less misleading than the subhead: "Unbounded High Dynamic Range Photography Using a Modulo Camera" In photographer's terms, they're referring to ending blown highlights (caused by filling the wells in a sensel) not s…
Earlier quoted context omitted.
The Foveon sensor is different - the claimed benefit there has to do with stacked silicon and lack of debayering, and the benefit is having better resolving power with the same pixel count. Sony is now researching similar stacked chips so we'll probably see this idea return. The innovation with the tech in the article is in the dynamic range, current CMOS sensors have a fairly limited maximum dynamic range because of…
Indeed, I know what you've written and I agree with it -- writing it all in the first place would've resulted in a wall of text! I'm still unsure if there's a real benefit in this technology, or if the same result can be obtained by increasing the bit precison in the ADC stage of a "normal" sensor. Even if there were, I pointed at the Foveon X3 as an example of a very good technology that was regardarded as a breakth…
I don't think Lytro will ever take off in the way they intended, but light field capture will be very hot for 3D360 VR in a couple of years, when we start seeing first light field goggles (like Magic Leap)
Here's an idea, instead of separately tracking the number of "resets" we just add those bits on to the left hand side of the measurement. We could call it... having more bits in the ADC. Expose for the highlights and then pull more detail out of the shadows with your extra bits of ADC precision. There are not 1 million ADC units in a 1-megapixel camera, there's a few ADCs (a Canon 7D has 2 image processors with 4 ADC…
Looks to be more related to exposure than saturation but still, it's an interesting new take on dynamic range. I'm more a hobbyist than an expert but current tone mapping techniques (at least anything mostly automated) can often leave you with "halos" around objects where the software has feathered the edges between lighter and darker areas. Then the article mentions the issues with using multiple shots for tone mapp…
Halos are a problem, but they can mostly be removed with good post-processing. Note they're not a fundamental aspect of tone mapping. Tone mapping is just whatever algorithm you chose to compress the HDR information into a low dynamic range we have for displays. The great thing about this camera compared to multi-exposure HDR (apart from the halo effect you mentioned) is you can actually take pictures of moving objec…
Red Epic does this with HDR-X and hacked Canon cameras with Magic Lantern with Dual ISO
Earlier quoted context omitted.
The Foveon sensor is different - the claimed benefit there has to do with stacked silicon and lack of debayering, and the benefit is having better resolving power with the same pixel count. Sony is now researching similar stacked chips so we'll probably see this idea return. The innovation with the tech in the article is in the dynamic range, current CMOS sensors have a fairly limited maximum dynamic range because of…
Worth noting that those "HDR" televisions are still only Rec709 which is limited to about 6 stops of dynamic range. Sure some are approaching rec2020 color gamut, but we're still cramming all that gamma down into 6-9 stops. Even a consumer DSLR can shoot 12. I work in post and have moved our workflow over to the Academy Color Encoding Specification (ACES) which supports up to 27 stops (more than the eye can see which…
Yep first "HDR" tv's will be rec709 but higher DR is definitely coming, both to home TVs and cinemas (via super bright laser projectors) http://blog.abelcine.com/2015/03/06/high-dynamic-range-expla...
I'm actually not convinced most people will want 5-100x brighter pictures than we currently have! Dynamic range of the human eye is also related to foveal/peripheral vision, so dynamic range in the real world probably doesn't map 1:1 to a small screen experience - if that makes sense.
http://www.rags-int-inc.com/PhotoTechStuff/CameraEye/
I am very interested in "natural", halo free tone mapping algorithms, squeezing that extended DR into current displays. I really like the results Adobe is getting with laplacian pyramids in Camera Raw for highlight/shadow recovery. Do you know of other tone mapping algos that look natural?
> No more will photographers or even ordinary people have to fumble with aperture size and exposure length. This is a "computer scientists" understanding of photography, and this phrase alone can even be seen as "dangerous" by photographers. There's more to aperture size and exposure length than "how much light reaches the sensor", like focus, depth of field, motion blur and bokeh, to name a few, that is not aknowled…
> This is a "computer scientists" understanding of photography, and this phrase alone can even be seen as "dangerous" by photographers. The actual headline of the article is actually more informative and less misleading than the subhead: "Unbounded High Dynamic Range Photography Using a Modulo Camera" In photographer's terms, they're referring to ending blown highlights (caused by filling the wells in a sensel) not s…
What's funny is that the iPhone (and a high end Android phone) has way faster processors than your typical $10.000 DSLR.
> No more will photographers or even ordinary people have to fumble with aperture size and exposure length. This is a "computer scientists" understanding of photography, and this phrase alone can even be seen as "dangerous" by photographers. There's more to aperture size and exposure length than "how much light reaches the sensor", like focus, depth of field, motion blur and bokeh, to name a few, that is not aknowled…
It sounds from the implementation summary that it's equivalent to a higher bit-depth ADC, but that the higher-value bits are inferred by software somehow. I don't think it would properly recover an image with a dark field with the exception of a single pixel with a value of 10^7 above the dark noise. What would truly solve the dynamic-range problem is a logarithmic readout CCD. (Thanks for the Foveon pointer; it's an…
Then again it doesn't matter, because that's a contrived example (the photography equivalent of a "microbenchmark").