| Author | Comment | Last activity | Moderation | ||
|---|---|---|---|---|---|
| ThomasTaufan | "Chris, please look at my image taken from modified camera using red filter bought from Public Lab. Is this the correct results or should I do some ..." | Read more » | over 3 years ago | |||
| ThomasTaufan | "how to process single multispectral image with the modified webcam and red filter? Because when I saw your example, it is processing 2 images that ..." | Read more » | over 3 years ago | |||
| ramprasadraju1998 | "This is one of the best blog for free Model papers 2020 About AP 10th 12th intermodelPapers, WHich can be very helpful fro your Daily life. Stay in..." | Read more » | over 3 years ago | |||
| zomb23 | "Hi Chris, thank you for the quick and comprehensive response. That sounds really promising. I will look into chlorophyll fluorescence and if/how I ..." | Read more » | over 3 years ago | |||
| jevs | "Apparently a capital F and a lowercase f mean something different. I changed my post to a lowercase f=3.85mm. Apparently f is focal length and F is..." | Read more » | over 3 years ago | |||
| stef | "there may be some answers for you in the research notes produced by @Stoft and @Warren on the topic of camera's native resolution and optics as a ..." | Read more » | over 3 years ago | |||
| cfastie | "I think NDVI will provide some information about the photosynthetic rate of mosses. Moss leaves capable of rapid photosynthesis will probably be ab..." | Read more » | over 3 years ago | |||
| nstarli | "Where can I find the blue calibration card? I could not find it on the public lab store. " | Read more » | over 3 years ago | |||
| nickyshen0306 | "Thanks for giving me so many solutions!! I will try it. " | Read more » | over 3 years ago | |||
| lfent | "@cfastie I found that I needed the heavy cyan filtration (at the expense of all the exposure variables you mention) to achieve an image approximati..." | Read more » | over 3 years ago | |||
| cfastie | "@lfent, Is there any difference between using two filters and using one filter if both photos are exposed so the photos have the same general brigh..." | Read more » | over 3 years ago | |||
| lfent | "Yes, a cyan filter will block the red light from the red-NIR pixels, may I suggest the Rosco 4390 CalColor 90 Cyan gel filter. I found that I need ..." | Read more » | over 3 years ago | |||
| 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 » | over 3 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 » | over 3 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 » | over 3 years ago | |||
| bibekshah000 | "https://hackplaza.com/ " | Read more » | over 3 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 » | almost 4 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 » | almost 4 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 » | almost 4 years ago | |||
| cfastie | " That's a good idea. Maybe someone has figured out good values for blue and red. " | Read more » | almost 4 years ago | |||
| kauemv2 | " Many Thanks for your answer, cfastie!! So, can I ask for the question for awb_gains in another thread? " | Read more » | almost 4 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 » | almost 4 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 » | almost 4 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 » | almost 4 years ago |