| Author | Comment | Last activity | Moderation | ||
|---|---|---|---|---|---|
| warren | "That sounds great. Do you have a Github account? If so, could you add that to https://github.com/publiclab/spectral-workbench/issues/new ? If not, ..." | Read more » | about 8 years ago | |||
| viechdokter | "I like the latter approach ("does calibration still hold?") best. Otherwise you have to recalibrate each time for a new cross section which is a bi..." | Read more » | about 8 years ago | |||
| warren | "Yes, it doesnt make the assumption that all cross sections are equal because it doesn't know if you uploaded or live-waterfall-captured -- uploads ..." | Read more » | about 8 years ago | |||
| nedhorning | "Here are a couple links that should help you get started: https://publiclab.org/wiki/infragram https://publiclab.org/notes/mlamadrid/12-08-2015/pho..." | Read more » | about 8 years ago | |||
| ino | "hello, I have a infrared-visible camera, how i get the NDVI image? " | Read more » | about 8 years ago | |||
| bortek | "Thanks Clayton. I am on it now. :) " | Read more » | about 8 years ago | |||
| Claytonb | "@bortek -the blue in the NDVI image is related to the value of the color LUT I applied to the image during processing. I did that to help me to see..." | Read more » | about 8 years ago | |||
| bortek | "@Claytonb - I am planning to start with a single camera and do some initial testing and learning before I go over to two cameras. Yes the focusing..." | Read more » | about 8 years ago | |||
| Claytonb | "Here is a similar scene with the Event38 at about the same height. This is with f/4, exp 1/1250, ISO 100 " | Read more » | about 8 years ago | |||
| Claytonb | "@bortek -I am assuming that the noise is partly due to the filter thickness and light requirement. I believe the Event38 filter is 0.5mm thick and ..." | Read more » | about 8 years ago | |||
| bortek | "This is really interesting. I have read Ned's article too and it is clearly better contrast when using red filter versus blue. I have just receive..." | Read more » | about 8 years ago | |||
| JacobNederend | "@nedhorning Today I rescued an old light source and integrating sphere from the scrap heap on campus. I don't think the light source is a monochrom..." | Read more » | about 8 years ago | |||
| cfastie | "Correction: When I calibrate Corrected Snowy CFL (with itself), I can get a Fit as good as 5. But the two spectral images are not well aligned when..." | Read more » | about 8 years ago | |||
| cfastie | "Ah, set as in SW set! Here is one with CFL spectra from you, me, stoft, and spectra4cps: https://spectralworkbench.org/sets/3165. All of these sho..." | Read more » | about 8 years ago | |||
| warren | "Oh, just the spectra you're looking at to reach those conclusions. Sorry to mix vocab :-) " | Read more » | about 8 years ago | |||
| cfastie | "What do you mean by references? " | Read more » | about 8 years ago | |||
| warren | "Could you make a set of good double green line references to look at? " | Read more » | about 8 years ago | |||
| warren | "There are a few places where we do math -- like convert from 0-255 to 0.000-1.000, and when repeated over many pixels, its possible that there are ..." | Read more » | about 8 years ago | |||
| cfastie | "Jeff, I made a corrected (ideal) version of the Snowy Sky CFL spectral image when we were working through this in October. This is the basis for t..." | Read more » | about 8 years ago | |||
| warren | "Hi, Chris - because we used lots of peaks to determine "fitness", we'd need all of the following nanometer positions plus their intensity (0-255): ..." | Read more » | about 8 years ago | |||
| cfastie | "Jeff, are these the specs for the image you need for the reference spectrum: 1390 px wide with the blue 436 peak at 211 pixels from left, and the g..." | Read more » | about 8 years ago | |||
| liz | "Great detective work @warren and @cfastie! " | Read more » | about 8 years ago | |||
| warren | "Well, both images were taken from the same device within about 20 minutes, so you can check their images against one another even if they're not ac..." | Read more » | about 8 years ago | |||
| cfastie | "That's some excellent detective work. We know there is mercury in all fluorescent lamps, so all the big mercury peaks should be present in all good..." | Read more » | about 8 years ago |