| Author | Comment | Last activity | Moderation | ||
|---|---|---|---|---|---|
| nedhorning | "Here are a couple ways to do this. One is to use two cameras mounted as close as possible to one another with the shutter release synchronized to b..." | Read more » | almost 5 years ago | |||
| MaggPi | "Hi, -One option would be to use near infrared LED strip lights similar to what was done here: https://www.youtube.com/watch?v=Y6Vz6sSnXhY&feat..." | Read more » | almost 5 years ago | |||
| cfastie | "If you are taking a still photo every hour or so, you might be able to take a flash photo. A split second flash of visible light might not interfer..." | Read more » | almost 5 years ago | |||
| bibekshah000 | "https://hackplaza.com/ " | Read more » | almost 5 years ago | |||
| DaleHCook | "As a follow up, I do not do IR photography so I have not looked elsewhere on Public Lab, but good results could likely be achieved with a DSLR that..." | Read more » | about 5 years ago | |||
| kauemv2 | " Hello, I have a photo take with this kind of sensor: https://www.dropbox.com/s/7dddzda6at9d8a7/2019_0502_154807_246.JPG?dl=0 Hope that these one..." | Read more » | about 5 years ago | |||
| kauemv2 | "But, only one more question before I make that post: what if i just apply the proper weights (in post-process, at the time of ndvi calculation) to ..." | Read more » | about 5 years ago | |||
| cfastie | " That's a good idea. Maybe someone has figured out good values for blue and red. " | Read more » | about 5 years ago | |||
| kauemv2 | " Many Thanks for your answer, cfastie!! So, can I ask for the question for awb_gains in another thread? " | Read more » | about 5 years ago | |||
| MaggPi | " To @cagiva, I applied the same NDVI technique to Nottingham UK planet.com satellite imagery; you can see the results on Mapknitter: https://ma..." | Read more » | about 5 years ago | |||
| cfastie | " The NDVI result will be the same whether you use one or more layers of filter. Using two layers reduces the amount of light reaching the sensor tw..." | Read more » | about 5 years ago | |||
| silentsairam | "Yes @warren . This is quite interesting and the satellite methodology approach would be more precise in mapping. I would be happy to explore more o..." | Read more » | about 5 years ago | |||
| cagiva | "Using the ultra blue Band 1 from LandSat 8, I created a video showing how to apply the NDVI to Landsat-8 images using QGIS. The tiles are from the..." | Read more » | about 5 years ago | |||
| warren | "@eustatic or @a1ahna ? " | Read more » | about 5 years ago | |||
| warren | " @silentsairam would you have any interest in this? " | Read more » | about 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 » | over 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 » | over 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 » | over 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 » | over 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 » | over 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 » | over 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 » | over 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 » | over 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 » | over 5 years ago |