| Author | Comment | Last activity | Moderation | ||
|---|---|---|---|---|---|
| cfastie | "I think if you capture camera raw you have a single number (DN) for each pixel and you know what kind of Bayer filter that pixel was under. The DN ..." | Read more » | over 8 years ago | |||
| cfastie | "In Spectral Workbench the Y-axis on the spectrogram is "Intensity (%)." If you took the sum of all three channels and plotted them on the same grap..." | Read more » | over 8 years ago | |||
| cfastie | "Hi Rayishido, They are beautiful mosaics. I didn't have any problem using these images in Fiji. But the Photo Monitoring plugin does not do a very..." | Read more » | over 8 years ago | |||
| cfastie | "There is a discussion of common materials with spectral data in the comments here: https://publiclab.org/notes/LaPa/03-31-2016/raspberry-noir-cam-..." | Read more » | over 8 years ago | |||
| cfastie | "I don't think I ever posted a tube fluorescent spectrum. But that's a good idea because those Wikipedia spectra of tube lamps don't all have the se..." | Read more » | over 8 years ago | |||
| cfastie | "Open an image in Fiji and hover the cursor over it. At the bottom of the Fiji window it will say "value=" followed by three numbers which are the R..." | Read more » | over 8 years ago | |||
| cfastie | "You need a program like Fiji to see the RGB values. The latest photo has more yellow orange color in the foliage so it should do a good job discrim..." | Read more » | over 8 years ago | |||
| cfastie | "There is a discussion of controlling the white balance on the Raspberry Pi camera here: https://publiclab.org/notes/LaPa/12-03-2015/how-do-i-set-a-..." | Read more » | over 8 years ago | |||
| cfastie | "It would be helpful to know how you made those photos (camera, filters, white balance). I am guessing they were made with an RPi NoIR camera with a..." | Read more » | over 8 years ago | |||
| cfastie | "That might be normal behavior for the spectrometer. The slit allows only a narrow beam of light to hit the diffraction grating. If the beam does no..." | Read more » | over 8 years ago | |||
| cfastie | "All fluorescent lamps produce visible light when UV light from excited mercury gas excites phosphors coating the inside of the lamp. Most compact f..." | Read more » | over 8 years ago | |||
| cfastie | "That's going to be an awesome prairie. I hope you can keep up with the kudzu. Are you going to repair the pole? Some standard fiberglass fabric soa..." | Read more » | over 8 years ago | |||
| cfastie | "You betcha there's research about how mammal grazing and browsing impact carbon and nutrient cycles. A couple of my buddies from graduate school de..." | Read more » | over 8 years ago | |||
| cfastie | "A DIY spectrometer can be used to characterize the spectral reflectivity of a target if two things are true: The spectrometer must be sensitive i..." | Read more » | over 8 years ago | |||
| cfastie | "@stoft’s concerns about the effectiveness of a crowd-based and rule-based ranking system are probably justified because the active publiclab commun..." | Read more » | over 8 years ago | |||
| cfastie | "I had not considered legacy research notes, but I have a different view of them. Implementing some form of review has two main consequences: it sep..." | Read more » | over 8 years ago | |||
| cfastie | "That's very clever that users with good reputations can counteract unscrupulous newbies gaming the system for their buds. It would be cool if users..." | Read more » | over 8 years ago | |||
| cfastie | "Here is a proposal which might reconcile a few of the ideas presented here including: @stoft’s great idea of using a checklist to determine if a ..." | Read more » | over 8 years ago | |||
| cfastie | "Mathew, I haven't seen any spectral data for Rosco paints. Is there any reason to think that they would be better than other paints for NDVI calibr..." | Read more » | over 8 years ago | |||
| cfastie | "This suggests that UK balloons, like UK kites, must be kept under 60 m agl without special permission. There are similar restrictions in the US but..." | Read more » | over 8 years ago | |||
| cfastie | "It would be great to have a few paints that: had reflectance spectra for 400 nm to 1000 nm, were exterior paint, were matte finish paint, were av..." | Read more » | over 8 years ago | |||
| cfastie | "Another rather important topic is the strict altitude limitations for kites and balloons in the UK. Kites are not allowed to be more than 60m above..." | Read more » | over 8 years ago | |||
| cfastie | "I assume the kite line sold at the KAPshop is good braided polyester. Dacron is DuPont's brand of polyester, so it does not have to be Dacron. The ..." | Read more » | over 8 years ago | |||
| cfastie | "I don't know of any commercially available inexpensive calibration targets. A good calibration target will have the same reflectance for all wavele..." | Read more » | over 8 years ago |