| Author | Comment | Last activity | Moderation | ||
|---|---|---|---|---|---|
| btbonval | "If PhotosynQ people want to make their own wiki, they're free to grab the content from your note here or the wiki page I made from your note. Every..." | Read more » | over 9 years ago | |||
| btbonval | "Stripped out all the juicy plant bits and spectral mumbo jumbo. added it here: http://publiclab.org/wiki/multispectral-analysis-for-determining-pla..." | Read more » | over 9 years ago | |||
| btbonval | "Apologies if I was being pedantic. Now that I think about it, cleaning up the note isn't a great solution. Instead of changing this note, the perti..." | Read more » | over 9 years ago | |||
| btbonval | "Woops I skipped the part at the top where it seems to suggest in advertisement language that the PhotosynQ gives you this and more! Any chance you..." | Read more » | over 9 years ago | |||
| btbonval | "This is a really good collection of information about photosynthesis and spectral analysis. My understanding was that NDVI has largely been used f..." | Read more » | over 9 years ago | |||
| btbonval | "I think it would be difficult to measure for heavy metals without interacting with the plant in some way, as the metals are unlikely to be hanging ..." | Read more » | over 9 years ago | |||
| btbonval | "As an example of something with low specific heat capacity, you could fill your fridge with metal pots. Although the pots won't fall out of the fri..." | Read more » | over 9 years ago | |||
| btbonval | "As a heads up, the contents of the refridgerator can make a huge difference. If you have a fridge with nothing in it at all, the fridge is only co..." | Read more » | over 9 years ago | |||
| btbonval | "Have you analyzed your different brew techniques using the Spectrometer? Do you think we would see the spectrum for flavor? " | Read more » | over 9 years ago | |||
| btbonval | "I just realized the images shown in the research note are thumbnails. The threshold enhancement helped the thumbnails a lot. Looking at the actual..." | Read more » | over 9 years ago | |||
| btbonval | "@amysoyka Yeah, that's pretty much what I meant. It worked way better than I would have thought. You can see wrinkles and bubbles in the tape! Inv..." | Read more » | over 9 years ago | |||
| btbonval | "The inverse helps make particles stand out. Another filter you might try is a threshold. If you're using GIMP (free and open source software for im..." | Read more » | over 9 years ago | |||
| btbonval | "This is looking good. I love the grid layout pattern. I see this is incomplete, but I wanted to let you know the black square (which has a slit cu..." | Read more » | over 9 years ago | |||
| btbonval | "I think part of the problem is that infrared light and visible light (and each subdivision thereof) are reflected differently at the interface of a..." | Read more » | over 9 years ago | |||
| btbonval | "Part of the issue here would be the IR reflectance of the water's surface (due to the index of refraction of the water/air boundary), which I under..." | Read more » | over 9 years ago | |||
| btbonval | "Talking about density, temperature, and floating makes me think of a Galileo thermometer: they are sealed with little glass beads that show the tem..." | Read more » | over 9 years ago | |||
| btbonval | "Canoes shouldn't create eddies that penetrate very deeply into the water current. Did the dye penetrate into the water or rest on top? If the dye ..." | Read more » | over 9 years ago | |||
| btbonval | "@warren @nemo @dorncox @cfastie @karenv I finally went through the ubiq show from Italian TV for screen caps. I also made a PL-specific cut of the..." | Read more » | over 9 years ago | |||
| btbonval | "On the plots, it looks like you have linearly sampled x-data, around 300 nm to 700 nm. The question is whether each x-value is equally spaced. If t..." | Read more » | over 9 years ago | |||
| btbonval | "@warren You aren't taking integrals, you're accumulating y-values. This might be equivalent if and only if the difference between x-value samples ..." | Read more » | over 9 years ago | |||
| btbonval | "In numpy, it'd be fairly easy. # establish that x and y are 1d vectors xdata = data[0,:] ydata = data[1,:] # perform cumulative sc..." | Read more » | over 9 years ago | |||
| btbonval | "If you have access to matrix math, I can vectorize the previous algorithm to speed it up. If you're in client javascript, I'm unaware of any good v..." | Read more » | over 9 years ago | |||
| btbonval | "Here's a dirty and slow way to determine the 50% mark: Firstly, normalize your data by dividing the integral (area under the curve). The area unde..." | Read more » | over 9 years ago | |||
| btbonval | "@stoft the centroid would be a point (x,y), not a line (x=B for all y). sorry to nitpick verbiage. I got all mathy in this post, figured I'd keep u..." | Read more » | over 9 years ago |