infrared
infrared


Author Comment Last activity Moderation
warren "Are you developing on GitHub, and might I follow your progress there? " | Read more » about 8 years ago
warren "Well, basically we just take the incoming image pixel by pixel, and for each of the input pixels, we plug their color values into the "infragrammar..." | Read more » about 8 years ago
jfd "Hi Warren, Thank you for your email; I see this is a greenfield area. I'd like to get this implementation to run as fast as possible. If you could..." | Read more » about 8 years ago
warren "Hi, this is a good question, but I wanted to suggest possibly adapting the WebGL implementation which is awfully fast: https://github.com/p-v-o-s/..." | Read more » about 8 years ago
suman "i want to buy DYI plant health analyzer filter......i tried to buy from public labs but it's already out of stock. How can i possibly buy it for in..." | Read more » about 8 years ago
azaelb "Thanks warren, I got these cameras from Amazon, vendor digital_family, product ASIN B01FLVPZNY. It is now under $60. On pictures I just had some pi..." | Read more » about 8 years ago
warren "Also do you have any pics you took with the camera to share? Raw and NDVI for comparison? Thank you!!! " | Read more » about 8 years ago
warren "Wow, amazing -- do you have a link to where you can buy this camera, and any data on how much it weighs? It could be a great alternative for people..." | Read more » about 8 years ago
thechapu "@carolccarvalho mi nombre es Cristofer, soy de Chile. Llevo 2 años usando raspberry y mas de 1 año aprendiendo sobre NDVI, en la Universidad tuve u..." | Read more » about 8 years ago
cfastie "I have one of the first Mobius cameras that Public Lab bought to test. It has the standard lens. I removed the IR cut filter (note) and then after ..." | Read more » about 8 years ago
abdul "Thanks Chris. I'll try adjusting the white balance a bit, and then posting a research note about it. I'll tag you in it. Do you have one of our new..." | Read more » about 8 years ago
cfastie "Abdul, It is possible that the new lens has different coatings which alter the color balance (red:NIR). This might require an adjustment to the cus..." | Read more » about 8 years ago
abdul "@warren @cfastie So I took a new photograph with the adjusted config file, as I had indeed uploaded the wrong one. The photo looks like this when..." | Read more » about 8 years ago
warren "Abdul - it looks like the config file you're using is not set up with a corrected white balance. This page has the corrected WB required as Chris ..." | Read more » about 8 years ago
cfastie "The lamp post, the wall, and parts of the tree trunk are all very dark. It is a common artifact that NDVI computed for dark areas of photos is not ..." | Read more » about 8 years ago
cfastie "Abdul, You are correct that all of the things you list could be responsible for the failure to produce a meaningful NDVI image. It could also be du..." | Read more » about 8 years ago
warren "Or perhaps the lead image here, which uses the #19 Rosco "fire" filter currently in the Mobius Infragrams: https://publiclab.org/notes/mathew/04-30..." | Read more » about 8 years ago
warren "This is so great, Abdul!!! One note -- the lead image shows a blue-filtered image, whereas the Mobius uses a red-filtered sensor. So perhaps the l..." | Read more » about 8 years ago
spandan1234 "Hi cfastie, I need a little help here. Following your suggestions I did all the calibrations required and the results were great. But in the last f..." | Read more » about 8 years ago
cfastie "The spectral response figure came from an article linked in this thread: https://groups.google.com/forum/#!topic/plots-infrared/aJhM30D6bUM That's..." | Read more » about 8 years ago
curiousity "thanks to @cfastie for the interesting charts... How did you take it ? Looking at chart, using just the blue channel as NIR the NIR/VIS sensitivi..." | Read more » about 8 years ago
cfastie "All three Bayer filters (R,G,B) transmit some near IR light. Above: Spectral response of a Canon PowerShot A2200 before (top) and after (bottom)..." | Read more » about 8 years ago
curiousity "You said ...With the red filter we can be fairly confident that the blue channel contains primarily NIR light... But how this happens ? As I know..." | Read more » about 8 years ago
Claytonb "@Artichoke23 - What I have seen in testing is that a red filter will give you much greater contrast and sensitivity in crop vigor. A good example i..." | Read more » over 8 years ago