infrared
infrared


Author Comment Last activity Moderation
nedhorning "Can you post one of your RAW images? I looked at Image1.dng and that shows the Bayer pattern so it needs to go through a debayer process to create ..." | Read more » over 5 years ago
Corymbia "How do you make sure the white balancing step is omitted? I tried that myself (see table 3 and figure 5 in my note), but the resulting NDVI values ..." | Read more » over 5 years ago
nedhorning "I use RAW pixel values for calibration analysis and since white balance doesn't impact RAW values I don't usually worry about it. If you want to us..." | Read more » over 5 years ago
Corymbia "Thanks, I will try! One more problem I noticed yesterday was that (at least when I set the white balance on a red/white surface) the red channel g..." | Read more » over 5 years ago
nedhorning "The calibration coefficients are, in the simplest case, the slope and y-intercept of the linear regression line for wavelength (based on calibratio..." | Read more » over 5 years ago
Corymbia "Thanks for the advice. How are the calibration coefficients calculated? I need to take photos of >50 trees in a glasshouse, so even within one s..." | Read more » over 5 years ago
nedhorning " If you're using them for calibration you should be fine taking photos of the targets every so often. The calibration coefficients shouldn't change..." | Read more » over 5 years ago
Corymbia "I realised that my tiles may be too shiny and grabbed some matt paint samples (pieces of matt paper) from a local store. They’re small and light, m..." | Read more » over 5 years ago
nedhorning "I just read over Rob Sumner's RAW guide and see Adobe DNG Converter is free. It also looks like he did some pretty rigorous tests so my previous co..." | Read more » over 5 years ago
nedhorning "The tables look great. Before the end of the week I'll try to compare your converted image with on that I run through dcraw to see if they are simi..." | Read more » over 5 years ago
Corymbia " Hi Ned, Thanks for your comment, it was mainly your notes that inspired my camera conversion :) I (hope I) fixed the tables by inserting print sc..." | Read more » over 5 years ago
nedhorning " Hi Corymbia – It’s nice to see some new work in this area. I see that you used the Adobe DNG converter. You might want to look into that to under..." | Read more » over 5 years ago
Corymbia "Hi Chris, I made a simple test earlier today, so far only managed to look at the JPEG file data (I have an old code for reading DNG into Matlab (ba..." | Read more » over 5 years ago
cfastie " One photo every 50 shots might be sufficient. It depends on how much the light changes during that time (5 minutes?, an hour?, a day?). You might ..." | Read more » over 5 years ago
Corymbia " Hi Chris, Thanks for your answer! Very helpful. 1) Regarding the reflectance targets. I bought a dozen of ceramic tiles in different colours (inc..." | Read more » over 5 years ago
cfastie " You are correct that your multi-day observation will present some problems. It is possible that doing a custom white balance on each day will comp..." | Read more » over 5 years ago
Corymbia " Hi Chris, Many thanks. I managed to get a DB660/850 filter and should have my camera (Olympus E-M10 Mark II) converted this week. It did cost an a..." | Read more » over 5 years ago
cfastie "The primary advantage of dual band filters is that they pass much narrower bands of wavelengths than red or blue filters (which also pass NIR). Th..." | Read more » over 5 years ago
Corymbia "Hi, thanks for the post. I'm planning to re-convert my NIR-adapted camera (currently with a blue filter) due to its rather poor performance in dete..." | Read more » over 5 years ago
cagiva "@cfastie, You were absolutely correct. The Blue card from PublicLab arrived today so I redid the white-balancing calibration with it and I got much..." | Read more » over 5 years ago
cagiva "Hi @Tbtouaki Was your NDVI balloon mapping a research project? Were you able to publish the results in a paper or blog? Best, ~~Al " | Read more » over 5 years ago
cfastie "Performing a custom white balance on a blue-filtered NIR camera fools the camera into exaggerating the brightness of the red channel. The red chann..." | Read more » over 5 years ago
Chus " Gracias, Xose, me animas!! He pensado mezclar IR+ espectroscopía, voy a probar y si me sale algo aceptable lo publicaré. Saludos!! " | Read more » over 5 years ago
xose "Fantástico upgrade entonces! Creo que manazas y esto que has hecho no son muy compatibles ;D " | Read more » over 5 years ago