nrg
nrg


Author Comment Last activity Moderation
warren "Just linking this up with @nedhorning who has done a lot since!! " | Read more » about 5 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 6 years ago
Rayishido "VIS " | Read more » over 6 years ago
Rayishido "Hi, Iam back with some update on the project. I didn't tweak the program but I brought the written 87 filter. and put everything on my phantom 2. ..." | Read more » over 6 years ago
cfastie "That's a good description of what the Rosco blue filter does. Both the blue and the red channels will have a mixture of visible and NIR light. The ..." | Read more » almost 7 years ago
Rayishido "Hi! I was in the filed without internet. I wrote a program that trigger the photo on the second pi when a picture is taken with the first so it is..." | Read more » almost 7 years ago
cfastie "Do you know how well synchronized the photo pairs are? Do you have to start them both taking photos at the same time, or synchronize their clocks? ..." | Read more » almost 7 years ago
Rayishido "I am using 2 raspberry Pis (one camera on each) and I synchronize the shutters using interrupts. I had some strange behavior (one Pi taking more pi..." | Read more » almost 7 years ago
cfastie "The NDVI image in my last comment was made by stretching only the NIR channel. The default is to stretch both NIR and VIS and that usually works we..." | Read more » almost 7 years ago
Rayishido "Hi Chris, to obtain this picture you stretched the histogram of the visible or visible and IR. As far as I understand to make NDVI picture a visib..." | Read more » almost 7 years ago
cfastie "Both NDVI images look good. Both seem to have some biological meaning and both have reasonable NDVI values in areas that are shady which is very go..." | Read more » almost 7 years ago
Rayishido "Hi Chris! You assumed right! :D The pictures was taken with the pi noir and the blue filter and turned off the automatic white balance to set my o..." | Read more » almost 7 years ago
cfastie "Rayishido, I assume the orangish photo was taken with the PiNoir camera with a blue filter. By calibration I think you mean you used the AWB_gains..." | Read more » almost 7 years ago
Rayishido "Hi! Thank you very much for your answers! I have downloaded Fiji and it's plugin and will test as soon as possible. This weekend I am going to mak..." | Read more » almost 7 years ago
cfastie "Hi Rayishido, Nice Pi photos. Claytonb is correct about the shadows. It's a common artifact for dark areas to have very high NDVI values. In your ..." | Read more » almost 7 years ago
Claytonb "@Rayishido -the high NDVI values is a normal occurrence with shadows. You will notice that the NDVI values will change in the shadows depending on ..." | Read more » almost 7 years ago
cfastie "I think the Public Lab Store will ship filters to Europe: https://store.publiclab.org/collections/diy-infrared-photography/products/infragram-diy-f..." | Read more » almost 7 years ago
GFFchris "Hello, I wanted to ask if anyone has an idea on how to order the Rosco filter to Europe / Germany? Many Thanks! " | Read more » almost 7 years ago
Tbtouaki "Hi I had wrong white balance for my camera. Thanks everyone for the help. Sorry for the trouble If anyone has any idea on how to save pictures take..." | Read more » over 7 years ago
cfastie "The angle from which the photo is taken and the angle of the sun do influence the NDVI result. NDVI values are a function of how much red and NIR l..." | Read more » over 7 years ago
cfastie "Stretching the histograms of either the NIR or VIS (or both) channels used to make NDVI is a trick that can produce more meaningful NDVI. I don't k..." | Read more » over 7 years ago
kykytos "Is it important the station in which the photo is taken? I mean, how do you differ infrared reflected radiation from infrared emitted radiation (th..." | Read more » over 7 years ago
kykytos "@cfastie What do you mean with 'stretching the histogram of the infrablue photo'? Because if it means to reduce blue levels (increase NDVI levels),..." | Read more » over 7 years ago
Tbtouaki "Hi I have tried several white balance options before, base on what I've read. On this pics the settings were exactly the same as the maxmax camera...." | Read more » over 7 years ago