| Author | Comment | Last activity | Moderation | ||
|---|---|---|---|---|---|
| clinicaveterinariavivavet | "I don't know much about multigrain NDVI, but if I talk about veterinary " | Read more » | 11 months ago | |||
| warren | "Just linking this up with @nedhorning who has done a lot since!! " | Read more » | over 7 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 8 years ago | |||
| Rayishido | "VIS " | Read more » | over 8 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 8 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 9 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 9 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 9 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 9 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 9 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 9 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 9 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 9 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 9 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 9 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 9 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 9 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 9 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 9 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 9 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 9 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 9 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 9 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 9 years ago |