| Author | Comment | Last activity | Moderation | ||
|---|---|---|---|---|---|
| cfastie | "Pat, this is great progress. It looks like you stitched a 360 panorama. Two seconds is really quick. It might be hard to settle the camera for the ..." | Read more » | over 10 years ago | |||
| cfastie | "nbawawa, Yes there is a lot of potentially confusing information in this research note. The note is about a very special case in which photosynthe..." | Read more » | over 10 years ago | |||
| cfastie | "This is a good question to ask on the Public Lab infrared discussion forum. Research notes. " | Read more » | over 10 years ago | |||
| cfastie | " ...the NIR reflectance of the target affects how much the red/green/blue bayer mosaic filter allows through to the sensor. Roolark, I would thin..." | Read more » | over 10 years ago | |||
| cfastie | "I guess it depends which camera and spectrometer you want to connect. A good approach might be to make a 3D printable Ebert. That could work with m..." | Read more » | over 10 years ago | |||
| cfastie | "If you have Garmin GPS units, there might be a better way for students to georeference photos. If the Garmin units save track logs, with a waypoint..." | Read more » | over 10 years ago | |||
| cfastie | "Thanks for the link. For my ghost hunting, I have been buying PowerShot A590s for $20-$40, plus a $5 filter tube that snaps on, plus an $8 IR filte..." | Read more » | over 10 years ago | |||
| cfastie | "Do you have a link for those IR filters? " | Read more » | over 10 years ago | |||
| cfastie | "Hi Kendrick90, You're right that single camera systems have their limitations. The Wratten 25A camera produces a very good NIR channel (blue) with ..." | Read more » | over 10 years ago | |||
| cfastie | "What is the additional step to get a reflectance value? You are estimating the brightness of the reflected light arriving at the camera by using a ..." | Read more » | over 10 years ago | |||
| cfastie | "How close is this to what you are trying to do? NDVI depends on the difference between two values: the amount of near infrared light (in a parti..." | Read more » | over 10 years ago | |||
| cfastie | "Ned, From Mary’s scans, you knew the reflectance of your colored targets for every visible and near infrared wavelength. But it looks like you used..." | Read more » | over 10 years ago | |||
| cfastie | "Pat, That's a nice series of the construction site. It will be good to see those lined up in a sequence of some kind. That's the first time I have..." | Read more » | over 10 years ago | |||
| cfastie | "Instead of trying to measure air flow, you could impose a constant air flow. Chris Bartley said they got better results with a small fan in their S..." | Read more » | over 10 years ago | |||
| cfastie | "Ned, This approach looks really promising. I was writing a comment about how this fit in with our current way of making NDVI when I realized I did..." | Read more » | over 10 years ago | |||
| cfastie | "That one is really contrasty. I guess some experiments are in order to see how various white balance settings work and how the other photo settings..." | Read more » | over 10 years ago | |||
| cfastie | "This is excellent research. Do you think if I bought some "100% extra virgin olive oil" and sent you a sample, you could tell me if it was really 1..." | Read more » | over 10 years ago | |||
| cfastie | "The blue channel (NIR) is a little bright in the 19 photo (and the others as well). There are lots of pixels with 255 for blue, so the dynamic rang..." | Read more » | over 10 years ago | |||
| cfastie | "It makes sense that 26 has more difference between red and blue. The transmission cutoff is farther toward the NIR end of the spectrum, so less red..." | Read more » | over 10 years ago | |||
| cfastie | "This is Fire. It looks pretty good. " | Read more » | over 10 years ago | |||
| cfastie | "Thanks, download works! Mathew, The white balance settings for both of your Mobius shots at infragram.org are 288, 256, 432. That suggests the came..." | Read more » | over 10 years ago | |||
| cfastie | "I couldn't find a way to download Mathew's original Infragram from Infragram.org. Is there a way? All I could get was the result image. " | Read more » | over 10 years ago | |||
| cfastie | "Scott, If you still have that RC controlled KAP rig, there is another option for syncing the VIS and NIR cameras in your dual camera rig. The radio..." | Read more » | over 10 years ago | |||
| cfastie | "All three of those filters will probably be good replacements for Wratten 25. Doing some tests with them is the only way to tell, and I suspect it ..." | Read more » | over 10 years ago |