Community research

xose commented on Reduce light inside foldable PL spectrometer almost 3 years ago

By the way, the research on the foldable spectrometer got a little bit delayed because of this. B...

xose commented on Reduce light inside foldable PL spectrometer almost 3 years ago

Hey @warren It was a pleasure to assist to the inner workings of the lab and really great info to...

warren commented on WebJack: Testers needed! almost 3 years ago

Well, just asking about the positive pin shown on the Fritzing diagram -- 5 volts -- which is not...

rmeister commented on WebJack: Testers needed! almost 3 years ago

Not sure what 5V pin you mean, but yes a 4-pin cable is need to connect to the microphone input o...

warren commented on Web-based fisheye-removal prototype for correcting lens distortion almost 3 years ago

Hi, i dug into the code a bit and found the section I think we need to modify, but it's WebGL, an...

warren commented on Web-based fisheye-removal prototype for correcting lens distortion almost 3 years ago

Indeed, i used Scott's posted images and got the same issues. But then I tried cropping them to ...

warren commented on Reduce light inside foldable PL spectrometer almost 3 years ago

Hello @xose! Very glad to meet you over audio today. I came across this: https://quitter.se/noti...

warren commented on WebJack: Testers needed! almost 3 years ago

Hi, I noted that on the WebJack page, the illustration shows the use of the 5v pin, but here it's...

warren commented on Web-based fisheye-removal prototype for correcting lens distortion almost 3 years ago

Cool, thanks. I took a pic of a grid with my Mobius (an old one, i'm not actually sure of the len...

eustatic commented on Web-based fisheye-removal prototype for correcting lens distortion almost 3 years ago

See https://publiclab.org/notes/eustatic/11-11-2014/a-method-for-distorting-mobius-action-cam-ima...

SimonPyle commented on Automating ImageJ for particle image analysis almost 3 years ago

@warren: The link above was the most recent version, though I just added a GNU GPLv3 license and ...

mathew commented on Size of aerial imagery from balloons and kites almost 3 years ago

Yes, thanks, Chris! I was focusing on finding the right image, not getting the right numbers in.

cfastie commented on an answer about Size of aerial imagery from balloons and kites almost 3 years ago

Mathew, that diagram is a little misleading. A lens with a 45° field of view (focal length of 44m...

mathew commented on Size of aerial imagery from balloons and kites almost 3 years ago

Chris's simplified answer is illustrated in our balloon mapping guide: Most camera lenses have...

mathew commented on Automating ImageJ for particle image analysis almost 3 years ago

There is a large folder of sample image sets avaialble. I put a smaller set together here: https:...

mathew commented on analyzing passive monitors almost 3 years ago

You can see more about the shape descriptors for each particle here: https://publiclab.org/notes/...

mathew commented on analyzing passive monitors almost 3 years ago

The image analysis creates: perimeter of each particle area of each particle circularity of eac...

warren commented on Automating ImageJ for particle image analysis almost 3 years ago

Is there any sample input/output sets from going through this process, manually or automatically?...

warren commented on analyzing passive monitors almost 3 years ago

Hi! Just re-reading, is it right that the image analysis produces (as it's complete output): pe...

warren commented on Automating ImageJ for particle image analysis almost 3 years ago

Hi! Is Simon's macro still at the URL listed above? Or is there a more up-to-date version, poten...

ives commented on an answer about Size of aerial imagery from balloons and kites almost 3 years ago

That's the same measure I always adopted. For 100m above the ground level, 100m coverage at the s...

cfastie commented on Hack a camera to make you own DIY Near Infrared device almost 3 years ago

That seems to be one simple way to do it.

Annchy1809 commented on Hack a camera to make you own DIY Near Infrared device almost 3 years ago

Aaaa I see! So its all about the adding the contrast and projecting the image straight from the c...

cfastie commented on Hack a camera to make you own DIY Near Infrared device almost 3 years ago

It would be possible to make a version of that device. It requires a digital projector which will...

Annchy1809 commented on Hack a camera to make you own DIY Near Infrared device almost 3 years ago

cfastie , I am sorry but I can not resist to have one more question! Is it also possible to crea...

warren commented on Designing Tools for Learners (Not Users) almost 3 years ago

I've been thinking more about this and recalled Sara Hendren's great piece All Technology is Assi...

Annchy1809 commented on Hack a camera to make you own DIY Near Infrared device almost 3 years ago

Waw, thank you very much Chris!

cfastie commented on Hack a camera to make you own DIY Near Infrared device almost 3 years ago

Some light passes through human skin, and near infrared light (especially around 800 nm) passes t...

nedhorning commented on Improved DIY NIR camera calibration almost 3 years ago

Hi Jeff - This should be the image. Let me know if this is ok or if I need to post it some other ...

warren commented on Improved DIY NIR camera calibration almost 3 years ago

Hi, Ned - do you think you could post the original images from which you generated your NDVI? Tha...