plant-health
plant-health


Author Comment Last activity Moderation
clinicaveterinariavivavet "I don't know much about multigrain NDVI, but if I talk about veterinary " | Read more » about 2 months ago
utobolearning "other two images - they are more or less equal among the three channels as the camera can only see NIR. Can you think of any explanation? Why wou..." | Read more » over 3 years ago
bhavin "inavasive kitty cat " | Read more » about 4 years ago
mimiss " @mimiss has marked @amallozzi as a co-author. " | Read more » about 4 years ago
ExtinctAnimals "Here is an image of cats claw vines: https://www.flickr.com/photos/tgerus/6175082514 " | Read more » about 4 years ago
MaggPi " @petter_mansson1 It has taken me a while to get up to speed on your work. There are differences and similarities between our efforts. Please..." | Read more » almost 5 years ago
petter_mansson1 " This looks very interesting. I'm currently doing research within the same area https://publiclab.org/notes/petter_mansson1/04-09-2019/low-cost-ndv..." | Read more » almost 5 years ago
kumarvirendran " This is one the best blog for health. we are here give health-related best information. Those give you better health solution, which can be helpfu..." | Read more » about 5 years ago
nedhorning " I can think of two possible reason. The most obvious would be that the illumination changed and the other is that the sensor temperature change. S..." | Read more » about 5 years ago
Corymbia "Thank you both, I really appreciate your help. My tiles were far from perfect, but from next week on I will be able to test with six Spectralon sa..." | Read more » about 5 years ago
cfastie "Subtracting the blue channel from the red channel is a good first step for correcting for contamination of the red channel with NIR. With one parti..." | Read more » about 5 years ago
nedhorning "It's good you discovered that. Yesterday I started to write about the need to subtract the blue band (NIR) from the red band (red + NIR) so you get..." | Read more » about 5 years ago
Corymbia "Hi, I have some trouble previewing my processed DNG images in Matlab, but the channel values are similar to the ones in your image. Since the red c..." | Read more » about 5 years ago
nedhorning "I used this following dcraw command: dcraw -D -W -4 Image1.ORF to create this image which has been scaled to 16-bit integers: https://drive.googl..." | Read more » about 5 years ago
nedhorning " I have to run out now but will try to make time to check this in the morning. It's also possible it's due to the nature of the filter and after ca..." | Read more » about 5 years ago
Corymbia "Sure, I've just uploaded ORF files for all three images to the google drive (link at the end of my post). Unfortunately I couldn't find any inform..." | Read more » about 5 years ago
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 » about 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 » about 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 » about 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 » about 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 » about 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 » about 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 » about 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 » about 5 years ago