That’s awesome!

Hmm, when I tried to sign up I got a message that I was already on the waiting list.

EDIT: It looks like the page is making a request to cardiio.com, specifically, and if you’re at www.cardiio.com (the one you linked to) the response gets blocked by Same Origin Policy, and the page treats it the same as a you’re-already-on-the-list response. You might want to avoid hardcoding the hostname in the JS, and/or force everyone over to the www or non-www domain.

thanks for catching that!

Do you think it would be possible to see shifts in photosynthetic activity in plants due to low/high nutrients/humidity? Especially when IR-filter removed?

Yes. My father does research in this area. Specifically, inferring the health of vegetation (among other attributes of land cover) from statistical analysis of satellite imagery.

From what I recall, you can measure the level of photosynthetic activity in an area given the reflectivity of the land (and, I would think, some basic model of what type of vegetation is present in the area)

One example from his research: the fall of the Soviet Union had a statistically significant impact on weather patterns in Kazakhstan (the breadbasket of the USSR) because the land usage changed so much with agricultural policies before and after the fall.

Quick link to the research overview page: http://globalmonitoring.sdstate.edu/research.php

To measure the pulse of a person, you need to consider an interval of a few seconds, so it's safe to assume that the only thing that the position and strength of the light are almost constant. The time that takes the plants to reduce the amount of nutrients or water is much bigger, so I think that it would be much more difficult to compensate the changes in the ambient light.

Congratulations for, what seems to me, opening up the door [1] to a new world of CV applications! And of course for having the courage to commercialize it while your academic career is taking off.

[1] famous illustration from the enlightenment: http://www.lehrer.uni-karlsruhe.de/~za874/homepage/aufklaeru...

Just curious have you tried on people with darker skin colour/tan. I am trying to imagine, what adjustments you'll need to make to detect on them?

There was a sample in the video, right after the white guy. The effect was more subtle, but it was there.

that's right. what you're looking for is the transient changes (AC) in color due to increase blood perfusion whereas a person's baseline skin color can be considered the DC component.

That sounds awesome.

But from a scientific point of view, you don't really need spatial resolution for the heartbeat example, though, do you? If you just spent the same amount of money on getting high temporal and spectral resolution, surely one could do very cool things with 'just one pixel', so to speak. Especially if you had say 16 different wavelengths, instead of just 3.

If the face of a "patient" was tied to his bed, and light wasn't changing, and there was no movement around (i.e. in ideal conditions), then yeah.

But in the real world scenarios you want to take a look at more than one pixel, and use the rest of the picture for noise reduction & calibration.

That is for heartbeat. But yes, with better spectral resolution you might get some other cool data.

For increased temporal resolution you can just the rolling shutter with off-the-shelf hardware I guess.

What do you think of the many apps already on the market, possibly derived from your earlier work?

https://play.google.com/store/apps/details?id=com.macropinch...